Mercurial > cpython-lru_cache-weakref

annotate Objects/funcobject.c @ 80779:10d04bdb05ab 3.3

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Issue #16248: Disable code execution from the user's home directory by tkinter when the -E flag is passed to Python. Patch by Zachary Ware.
author Antoine Pitrou <solipsis@pitrou.net>
date Sun, 09 Dec 2012 14:46:46 +0100
parents f029312764b4
children b20bc1aa5686
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1
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2 /* Function object implementation */
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3
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4 #include "Python.h"
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5 #include "code.h"
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6 #include "structmember.h"
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7
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8 PyObject *
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9 PyFunction_NewWithQualName(PyObject *code, PyObject *globals, PyObject *qualname)
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10 {
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11 PyFunctionObject *op = PyObject_GC_New(PyFunctionObject,
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12 &PyFunction_Type);
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13 static PyObject *__name__ = 0;
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14 if (op != NULL) {
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15 PyObject *doc;
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16 PyObject *consts;
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17 PyObject *module;
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18 op->func_weakreflist = NULL;
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19 Py_INCREF(code);
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20 op->func_code = code;
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21 Py_INCREF(globals);
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22 op->func_globals = globals;
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23 op->func_name = ((PyCodeObject *)code)->co_name;
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24 Py_INCREF(op->func_name);
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25 op->func_defaults = NULL; /* No default arguments */
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26 op->func_kwdefaults = NULL; /* No keyword only defaults */
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27 op->func_closure = NULL;
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28 consts = ((PyCodeObject *)code)->co_consts;
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29 if (PyTuple_Size(consts) >= 1) {
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30 doc = PyTuple_GetItem(consts, 0);
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31 if (!PyUnicode_Check(doc))
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32 doc = Py_None;
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33 }
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34 else
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35 doc = Py_None;
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36 Py_INCREF(doc);
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37 op->func_doc = doc;
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38 op->func_dict = NULL;
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39 op->func_module = NULL;
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40 op->func_annotations = NULL;
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41
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42 /* __module__: If module name is in globals, use it.
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43 Otherwise, use None.
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44 */
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45 if (!__name__) {
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46 __name__ = PyUnicode_InternFromString("__name__");
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47 if (!__name__) {
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48 Py_DECREF(op);
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49 return NULL;
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50 }
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51 }
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52 module = PyDict_GetItem(globals, __name__);
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53 if (module) {
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54 Py_INCREF(module);
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55 op->func_module = module;
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56 }
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57 if (qualname)
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58 op->func_qualname = qualname;
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59 else
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60 op->func_qualname = op->func_name;
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61 Py_INCREF(op->func_qualname);
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62 }
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63 else
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64 return NULL;
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65 _PyObject_GC_TRACK(op);
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66 return (PyObject *)op;
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67 }
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68
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69 PyObject *
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70 PyFunction_New(PyObject *code, PyObject *globals)
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71 {
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72 return PyFunction_NewWithQualName(code, globals, NULL);
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73 }
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74
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75 PyObject *
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76 PyFunction_GetCode(PyObject *op)
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77 {
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78 if (!PyFunction_Check(op)) {
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79 PyErr_BadInternalCall();
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80 return NULL;
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81 }
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82 return ((PyFunctionObject *) op) -> func_code;
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83 }
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84
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85 PyObject *
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86 PyFunction_GetGlobals(PyObject *op)
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87 {
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88 if (!PyFunction_Check(op)) {
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89 PyErr_BadInternalCall();
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90 return NULL;
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91 }
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92 return ((PyFunctionObject *) op) -> func_globals;
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93 }
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94
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95 PyObject *
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96 PyFunction_GetModule(PyObject *op)
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97 {
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98 if (!PyFunction_Check(op)) {
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99 PyErr_BadInternalCall();
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100 return NULL;
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101 }
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102 return ((PyFunctionObject *) op) -> func_module;
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103 }
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104
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105 PyObject *
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106 PyFunction_GetDefaults(PyObject *op)
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107 {
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108 if (!PyFunction_Check(op)) {
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109 PyErr_BadInternalCall();
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110 return NULL;
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111 }
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112 return ((PyFunctionObject *) op) -> func_defaults;
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113 }
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114
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115 int
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116 PyFunction_SetDefaults(PyObject *op, PyObject *defaults)
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117 {
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118 if (!PyFunction_Check(op)) {
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119 PyErr_BadInternalCall();
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120 return -1;
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121 }
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122 if (defaults == Py_None)
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123 defaults = NULL;
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124 else if (defaults && PyTuple_Check(defaults)) {
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125 Py_INCREF(defaults);
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126 }
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127 else {
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128 PyErr_SetString(PyExc_SystemError, "non-tuple default args");
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129 return -1;
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130 }
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131 Py_XDECREF(((PyFunctionObject *) op) -> func_defaults);
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132 ((PyFunctionObject *) op) -> func_defaults = defaults;
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133 return 0;
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134 }
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135
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136 PyObject *
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137 PyFunction_GetKwDefaults(PyObject *op)
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138 {
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139 if (!PyFunction_Check(op)) {
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140 PyErr_BadInternalCall();
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141 return NULL;
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142 }
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143 return ((PyFunctionObject *) op) -> func_kwdefaults;
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144 }
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145
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146 int
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147 PyFunction_SetKwDefaults(PyObject *op, PyObject *defaults)
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148 {
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149 if (!PyFunction_Check(op)) {
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150 PyErr_BadInternalCall();
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151 return -1;
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152 }
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153 if (defaults == Py_None)
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154 defaults = NULL;
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155 else if (defaults && PyDict_Check(defaults)) {
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156 Py_INCREF(defaults);
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157 }
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158 else {
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159 PyErr_SetString(PyExc_SystemError,
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160 "non-dict keyword only default args");
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161 return -1;
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162 }
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163 Py_XDECREF(((PyFunctionObject *)op) -> func_kwdefaults);
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164 ((PyFunctionObject *) op) -> func_kwdefaults = defaults;
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165 return 0;
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166 }
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167
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168 PyObject *
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169 PyFunction_GetClosure(PyObject *op)
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170 {
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171 if (!PyFunction_Check(op)) {
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172 PyErr_BadInternalCall();
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173 return NULL;
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174 }
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175 return ((PyFunctionObject *) op) -> func_closure;
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176 }
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177
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178 int
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179 PyFunction_SetClosure(PyObject *op, PyObject *closure)
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180 {
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181 if (!PyFunction_Check(op)) {
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182 PyErr_BadInternalCall();
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183 return -1;
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184 }
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185 if (closure == Py_None)
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186 closure = NULL;
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187 else if (PyTuple_Check(closure)) {
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188 Py_INCREF(closure);
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189 }
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190 else {
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191 PyErr_Format(PyExc_SystemError,
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192 "expected tuple for closure, got '%.100s'",
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193 closure->ob_type->tp_name);
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194 return -1;
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195 }
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196 Py_XDECREF(((PyFunctionObject *) op) -> func_closure);
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197 ((PyFunctionObject *) op) -> func_closure = closure;
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198 return 0;
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199 }
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200
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201 PyObject *
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202 PyFunction_GetAnnotations(PyObject *op)
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203 {
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204 if (!PyFunction_Check(op)) {
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205 PyErr_BadInternalCall();
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206 return NULL;
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207 }
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208 return ((PyFunctionObject *) op) -> func_annotations;
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209 }
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210
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211 int
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212 PyFunction_SetAnnotations(PyObject *op, PyObject *annotations)
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213 {
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214 if (!PyFunction_Check(op)) {
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215 PyErr_BadInternalCall();
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216 return -1;
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217 }
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218 if (annotations == Py_None)
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219 annotations = NULL;
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220 else if (annotations && PyDict_Check(annotations)) {
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221 Py_INCREF(annotations);
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222 }
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223 else {
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224 PyErr_SetString(PyExc_SystemError,
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225 "non-dict annotations");
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226 return -1;
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227 }
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228 Py_XDECREF(((PyFunctionObject *)op) -> func_annotations);
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229 ((PyFunctionObject *) op) -> func_annotations = annotations;
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230 return 0;
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231 }
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232
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233 /* Methods */
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234
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235 #define OFF(x) offsetof(PyFunctionObject, x)
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236
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237 static PyMemberDef func_memberlist[] = {
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238 {"__closure__", T_OBJECT, OFF(func_closure),
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239 RESTRICTED|READONLY},
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240 {"__doc__", T_OBJECT, OFF(func_doc), PY_WRITE_RESTRICTED},
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241 {"__globals__", T_OBJECT, OFF(func_globals),
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242 RESTRICTED|READONLY},
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243 {"__module__", T_OBJECT, OFF(func_module), PY_WRITE_RESTRICTED},
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244 {NULL} /* Sentinel */
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245 };
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246
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247 static PyObject *
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248 func_get_code(PyFunctionObject *op)
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249 {
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250 Py_INCREF(op->func_code);
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251 return op->func_code;
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252 }
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253
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254 static int
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255 func_set_code(PyFunctionObject *op, PyObject *value)
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256 {
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257 PyObject *tmp;
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258 Py_ssize_t nfree, nclosure;
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259
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260 /* Not legal to del f.func_code or to set it to anything
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261 * other than a code object. */
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262 if (value == NULL || !PyCode_Check(value)) {
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263 PyErr_SetString(PyExc_TypeError,
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264 "__code__ must be set to a code object");
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265 return -1;
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266 }
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267 nfree = PyCode_GetNumFree((PyCodeObject *)value);
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268 nclosure = (op->func_closure == NULL ? 0 :
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269 PyTuple_GET_SIZE(op->func_closure));
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270 if (nclosure != nfree) {
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271 PyErr_Format(PyExc_ValueError,
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272 "%U() requires a code object with %zd free vars,"
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273 " not %zd",
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274 op->func_name,
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275 nclosure, nfree);
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276 return -1;
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277 }
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278 tmp = op->func_code;
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279 Py_INCREF(value);
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280 op->func_code = value;
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281 Py_DECREF(tmp);
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282 return 0;
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283 }
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284
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285 static PyObject *
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286 func_get_name(PyFunctionObject *op)
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287 {
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288 Py_INCREF(op->func_name);
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289 return op->func_name;
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290 }
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291
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292 static int
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293 func_set_name(PyFunctionObject *op, PyObject *value)
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294 {
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295 PyObject *tmp;
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296
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297 /* Not legal to del f.func_name or to set it to anything
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298 * other than a string object. */
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299 if (value == NULL || !PyUnicode_Check(value)) {
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300 PyErr_SetString(PyExc_TypeError,
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301 "__name__ must be set to a string object");
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302 return -1;
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303 }
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304 tmp = op->func_name;
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305 Py_INCREF(value);
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306 op->func_name = value;
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307 Py_DECREF(tmp);
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308 return 0;
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309 }
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310
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311 static PyObject *
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312 func_get_qualname(PyFunctionObject *op)
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313 {
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314 Py_INCREF(op->func_qualname);
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315 return op->func_qualname;
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316 }
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317
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318 static int
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319 func_set_qualname(PyFunctionObject *op, PyObject *value)
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320 {
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321 PyObject *tmp;
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322
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323 /* Not legal to del f.__qualname__ or to set it to anything
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324 * other than a string object. */
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325 if (value == NULL || !PyUnicode_Check(value)) {
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326 PyErr_SetString(PyExc_TypeError,
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327 "__qualname__ must be set to a string object");
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328 return -1;
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329 }
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330 tmp = op->func_qualname;
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331 Py_INCREF(value);
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332 op->func_qualname = value;
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333 Py_DECREF(tmp);
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334 return 0;
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335 }
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336
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337 static PyObject *
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338 func_get_defaults(PyFunctionObject *op)
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339 {
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340 if (op->func_defaults == NULL) {
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341 Py_INCREF(Py_None);
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342 return Py_None;
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343 }
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344 Py_INCREF(op->func_defaults);
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345 return op->func_defaults;
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346 }
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347
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348 static int
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349 func_set_defaults(PyFunctionObject *op, PyObject *value)
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350 {
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351 PyObject *tmp;
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352
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353 /* Legal to del f.func_defaults.
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354 * Can only set func_defaults to NULL or a tuple. */
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355 if (value == Py_None)
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356 value = NULL;
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357 if (value != NULL && !PyTuple_Check(value)) {
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358 PyErr_SetString(PyExc_TypeError,
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359 "__defaults__ must be set to a tuple object");
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360 return -1;
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361 }
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362 tmp = op->func_defaults;
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363 Py_XINCREF(value);
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364 op->func_defaults = value;
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365 Py_XDECREF(tmp);
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366 return 0;
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367 }
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368
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369 static PyObject *
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370 func_get_kwdefaults(PyFunctionObject *op)
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371 {
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372 if (op->func_kwdefaults == NULL) {
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373 Py_INCREF(Py_None);
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374 return Py_None;
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375 }
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376 Py_INCREF(op->func_kwdefaults);
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377 return op->func_kwdefaults;
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378 }
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379
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380 static int
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381 func_set_kwdefaults(PyFunctionObject *op, PyObject *value)
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382 {
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383 PyObject *tmp;
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384
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385 if (value == Py_None)
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386 value = NULL;
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387 /* Legal to del f.func_kwdefaults.
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388 * Can only set func_kwdefaults to NULL or a dict. */
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389 if (value != NULL && !PyDict_Check(value)) {
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390 PyErr_SetString(PyExc_TypeError,
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391 "__kwdefaults__ must be set to a dict object");
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392 return -1;
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393 }
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394 tmp = op->func_kwdefaults;
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395 Py_XINCREF(value);
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396 op->func_kwdefaults = value;
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397 Py_XDECREF(tmp);
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398 return 0;
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399 }
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400
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401 static PyObject *
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402 func_get_annotations(PyFunctionObject *op)
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403 {
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404 if (op->func_annotations == NULL) {
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405 op->func_annotations = PyDict_New();
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406 if (op->func_annotations == NULL)
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407 return NULL;
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408 }
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409 Py_INCREF(op->func_annotations);
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410 return op->func_annotations;
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411 }
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412
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413 static int
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414 func_set_annotations(PyFunctionObject *op, PyObject *value)
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415 {
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416 PyObject *tmp;
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417
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418 if (value == Py_None)
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419 value = NULL;
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420 /* Legal to del f.func_annotations.
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421 * Can only set func_annotations to NULL (through C api)
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422 * or a dict. */
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423 if (value != NULL && !PyDict_Check(value)) {
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424 PyErr_SetString(PyExc_TypeError,
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425 "__annotations__ must be set to a dict object");
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426 return -1;
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427 }
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428 tmp = op->func_annotations;
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429 Py_XINCREF(value);
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430 op->func_annotations = value;
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431 Py_XDECREF(tmp);
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432 return 0;
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433 }
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434
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435 static PyGetSetDef func_getsetlist[] = {
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436 {"__code__", (getter)func_get_code, (setter)func_set_code},
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437 {"__defaults__", (getter)func_get_defaults,
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438 (setter)func_set_defaults},
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439 {"__kwdefaults__", (getter)func_get_kwdefaults,
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440 (setter)func_set_kwdefaults},
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441 {"__annotations__", (getter)func_get_annotations,
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442 (setter)func_set_annotations},
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443 {"__dict__", PyObject_GenericGetDict, PyObject_GenericSetDict},
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444 {"__name__", (getter)func_get_name, (setter)func_set_name},
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445 {"__qualname__", (getter)func_get_qualname, (setter)func_set_qualname},
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446 {NULL} /* Sentinel */
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447 };
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448
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449 PyDoc_STRVAR(func_doc,
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450 "function(code, globals[, name[, argdefs[, closure]]])\n\
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451 \n\
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452 Create a function object from a code object and a dictionary.\n\
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453 The optional name string overrides the name from the code object.\n\
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454 The optional argdefs tuple specifies the default argument values.\n\
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455 The optional closure tuple supplies the bindings for free variables.");
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456
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457 /* func_new() maintains the following invariants for closures. The
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458 closure must correspond to the free variables of the code object.
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459
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460 if len(code.co_freevars) == 0:
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461 closure = NULL
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462 else:
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463 len(closure) == len(code.co_freevars)
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464 for every elt in closure, type(elt) == cell
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465 */
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466
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467 static PyObject *
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468 func_new(PyTypeObject* type, PyObject* args, PyObject* kw)
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469 {
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470 PyCodeObject *code;
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471 PyObject *globals;
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472 PyObject *name = Py_None;
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473 PyObject *defaults = Py_None;
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474 PyObject *closure = Py_None;
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475 PyFunctionObject *newfunc;
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476 Py_ssize_t nfree, nclosure;
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477 static char *kwlist[] = {"code", "globals", "name",
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478 "argdefs", "closure", 0};
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479
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480 if (!PyArg_ParseTupleAndKeywords(args, kw, "O!O!|OOO:function",
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481 kwlist,
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482 &PyCode_Type, &code,
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483 &PyDict_Type, &globals,
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484 &name, &defaults, &closure))
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485 return NULL;
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486 if (name != Py_None && !PyUnicode_Check(name)) {
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487 PyErr_SetString(PyExc_TypeError,
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488 "arg 3 (name) must be None or string");
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489 return NULL;
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490 }
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491 if (defaults != Py_None && !PyTuple_Check(defaults)) {
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492 PyErr_SetString(PyExc_TypeError,
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493 "arg 4 (defaults) must be None or tuple");
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494 return NULL;
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495 }
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496 nfree = PyTuple_GET_SIZE(code->co_freevars);
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497 if (!PyTuple_Check(closure)) {
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498 if (nfree && closure == Py_None) {
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499 PyErr_SetString(PyExc_TypeError,
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500 "arg 5 (closure) must be tuple");
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501 return NULL;
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502 }
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503 else if (closure != Py_None) {
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504 PyErr_SetString(PyExc_TypeError,
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505 "arg 5 (closure) must be None or tuple");
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506 return NULL;
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507 }
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508 }
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509
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510 /* check that the closure is well-formed */
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511 nclosure = closure == Py_None ? 0 : PyTuple_GET_SIZE(closure);
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512 if (nfree != nclosure)
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513 return PyErr_Format(PyExc_ValueError,
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514 "%U requires closure of length %zd, not %zd",
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515 code->co_name, nfree, nclosure);
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516 if (nclosure) {
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517 Py_ssize_t i;
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518 for (i = 0; i < nclosure; i++) {
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519 PyObject *o = PyTuple_GET_ITEM(closure, i);
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520 if (!PyCell_Check(o)) {
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521 return PyErr_Format(PyExc_TypeError,
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522 "arg 5 (closure) expected cell, found %s",
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523 o->ob_type->tp_name);
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524 }
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525 }
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526 }
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527
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528 newfunc = (PyFunctionObject *)PyFunction_New((PyObject *)code,
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529 globals);
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530 if (newfunc == NULL)
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531 return NULL;
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532
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533 if (name != Py_None) {
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534 Py_INCREF(name);
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535 Py_DECREF(newfunc->func_name);
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536 newfunc->func_name = name;
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537 }
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538 if (defaults != Py_None) {
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539 Py_INCREF(defaults);
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540 newfunc->func_defaults = defaults;
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541 }
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542 if (closure != Py_None) {
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543 Py_INCREF(closure);
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544 newfunc->func_closure = closure;
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545 }
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546
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547 return (PyObject *)newfunc;
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Guido van Rossum <guido@python.org>
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diff changeset
548 }
8e6760bf1884 SF patch 568629 by Oren Tirosh: types made callable.
Guido van Rossum <guido@python.org>
parents: 23832
diff changeset
549
6
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diff changeset
550 static void
13457
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diff changeset
551 func_dealloc(PyFunctionObject *op)
6
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552 {
61466
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553 _PyObject_GC_UNTRACK(op);
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554 if (op->func_weakreflist != NULL)
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555 PyObject_ClearWeakRefs((PyObject *) op);
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556 Py_DECREF(op->func_code);
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557 Py_DECREF(op->func_globals);
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558 Py_XDECREF(op->func_module);
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559 Py_DECREF(op->func_name);
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560 Py_XDECREF(op->func_defaults);
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561 Py_XDECREF(op->func_kwdefaults);
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562 Py_XDECREF(op->func_doc);
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563 Py_XDECREF(op->func_dict);
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564 Py_XDECREF(op->func_closure);
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565 Py_XDECREF(op->func_annotations);
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diff changeset
566 Py_XDECREF(op->func_qualname);
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567 PyObject_GC_Del(op);
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568 }
fc6fcd7df4f7 Initial revision
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569
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570 static PyObject*
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Fred Drake <fdrake@acm.org>
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571 func_repr(PyFunctionObject *op)
1257
1cabc2b6c970 * Changed all copyright messages to include 1993.
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572 {
61466
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573 return PyUnicode_FromFormat("<function %U at %p>",
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574 op->func_qualname, op);
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575 }
1cabc2b6c970 * Changed all copyright messages to include 1993.
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diff changeset
576
1399
cc172ce05561 Added compare operations for functions and code objects.
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diff changeset
577 static int
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diff changeset
578 func_traverse(PyFunctionObject *f, visitproc visit, void *arg)
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diff changeset
579 {
61466
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580 Py_VISIT(f->func_code);
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581 Py_VISIT(f->func_globals);
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582 Py_VISIT(f->func_module);
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583 Py_VISIT(f->func_defaults);
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584 Py_VISIT(f->func_kwdefaults);
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585 Py_VISIT(f->func_doc);
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586 Py_VISIT(f->func_name);
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587 Py_VISIT(f->func_dict);
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588 Py_VISIT(f->func_closure);
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589 Py_VISIT(f->func_annotations);
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590 Py_VISIT(f->func_qualname);
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591 return 0;
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diff changeset
592 }
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parents: 12576
diff changeset
593
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594 static PyObject *
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595 function_call(PyObject *func, PyObject *arg, PyObject *kw)
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596 {
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597 PyObject *result;
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598 PyObject *argdefs;
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599 PyObject *kwtuple = NULL;
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600 PyObject **d, **k;
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601 Py_ssize_t nk, nd;
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602
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603 argdefs = PyFunction_GET_DEFAULTS(func);
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604 if (argdefs != NULL && PyTuple_Check(argdefs)) {
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605 d = &PyTuple_GET_ITEM((PyTupleObject *)argdefs, 0);
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606 nd = PyTuple_GET_SIZE(argdefs);
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607 }
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608 else {
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609 d = NULL;
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610 nd = 0;
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611 }
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612
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613 if (kw != NULL && PyDict_Check(kw)) {
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614 Py_ssize_t pos, i;
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615 nk = PyDict_Size(kw);
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616 kwtuple = PyTuple_New(2*nk);
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617 if (kwtuple == NULL)
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618 return NULL;
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619 k = &PyTuple_GET_ITEM(kwtuple, 0);
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620 pos = i = 0;
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621 while (PyDict_Next(kw, &pos, &k[i], &k[i+1])) {
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622 Py_INCREF(k[i]);
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623 Py_INCREF(k[i+1]);
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624 i += 2;
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625 }
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626 nk = i/2;
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627 }
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628 else {
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629 k = NULL;
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630 nk = 0;
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631 }
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632
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633 result = PyEval_EvalCodeEx(
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diff changeset
634 PyFunction_GET_CODE(func),
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635 PyFunction_GET_GLOBALS(func), (PyObject *)NULL,
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636 &PyTuple_GET_ITEM(arg, 0), PyTuple_GET_SIZE(arg),
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637 k, nk, d, nd,
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638 PyFunction_GET_KW_DEFAULTS(func),
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diff changeset
639 PyFunction_GET_CLOSURE(func));
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640
61466
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641 Py_XDECREF(kwtuple);
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642
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643 return result;
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644 }
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645
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646 /* Bind a function to an object */
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647 static PyObject *
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648 func_descr_get(PyObject *func, PyObject *obj, PyObject *type)
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649 {
61466
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650 if (obj == Py_None || obj == NULL) {
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651 Py_INCREF(func);
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652 return func;
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653 }
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654 return PyMethod_New(func, obj);
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655 }
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656
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657 PyTypeObject PyFunction_Type = {
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658 PyVarObject_HEAD_INIT(&PyType_Type, 0)
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659 "function",
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660 sizeof(PyFunctionObject),
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661 0,
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662 (destructor)func_dealloc, /* tp_dealloc */
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663 0, /* tp_print */
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diff changeset
664 0, /* tp_getattr */
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665 0, /* tp_setattr */
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666 0, /* tp_reserved */
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667 (reprfunc)func_repr, /* tp_repr */
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668 0, /* tp_as_number */
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669 0, /* tp_as_sequence */
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670 0, /* tp_as_mapping */
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671 0, /* tp_hash */
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672 function_call, /* tp_call */
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673 0, /* tp_str */
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674 0, /* tp_getattro */
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675 0, /* tp_setattro */
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676 0, /* tp_as_buffer */
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677 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,/* tp_flags */
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678 func_doc, /* tp_doc */
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679 (traverseproc)func_traverse, /* tp_traverse */
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680 0, /* tp_clear */
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681 0, /* tp_richcompare */
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682 offsetof(PyFunctionObject, func_weakreflist), /* tp_weaklistoffset */
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683 0, /* tp_iter */
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684 0, /* tp_iternext */
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685 0, /* tp_methods */
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686 func_memberlist, /* tp_members */
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687 func_getsetlist, /* tp_getset */
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688 0, /* tp_base */
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689 0, /* tp_dict */
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690 func_descr_get, /* tp_descr_get */
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691 0, /* tp_descr_set */
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692 offsetof(PyFunctionObject, func_dict), /* tp_dictoffset */
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693 0, /* tp_init */
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694 0, /* tp_alloc */
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695 func_new, /* tp_new */
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696 };
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697
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698
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699 /* Class method object */
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700
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701 /* A class method receives the class as implicit first argument,
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702 just like an instance method receives the instance.
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703 To declare a class method, use this idiom:
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704
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705 class C:
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706 def f(cls, arg1, arg2, ...): ...
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707 f = classmethod(f)
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708
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709 It can be called either on the class (e.g. C.f()) or on an instance
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710 (e.g. C().f()); the instance is ignored except for its class.
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711 If a class method is called for a derived class, the derived class
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712 object is passed as the implied first argument.
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713
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714 Class methods are different than C++ or Java static methods.
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715 If you want those, see static methods below.
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716 */
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717
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718 typedef struct {
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diff changeset
719 PyObject_HEAD
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720 PyObject *cm_callable;
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721 PyObject *cm_dict;
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722 } classmethod;
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723
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724 static void
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725 cm_dealloc(classmethod *cm)
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726 {
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727 _PyObject_GC_UNTRACK((PyObject *)cm);
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728 Py_XDECREF(cm->cm_callable);
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f46deae68e34 allow arbitrary attributes on classmethod and staticmethod (closes #14051)
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729 Py_XDECREF(cm->cm_dict);
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730 Py_TYPE(cm)->tp_free((PyObject *)cm);
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731 }
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732
28537
c7bb254ab890 Make staticmethods and classmethods participate in GC.
Jeremy Hylton <jeremy@alum.mit.edu>
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diff changeset
733 static int
c7bb254ab890 Make staticmethods and classmethods participate in GC.
Jeremy Hylton <jeremy@alum.mit.edu>
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diff changeset
734 cm_traverse(classmethod *cm, visitproc visit, void *arg)
c7bb254ab890 Make staticmethods and classmethods participate in GC.
Jeremy Hylton <jeremy@alum.mit.edu>
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735 {
61466
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736 Py_VISIT(cm->cm_callable);
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737 Py_VISIT(cm->cm_dict);
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738 return 0;
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c7bb254ab890 Make staticmethods and classmethods participate in GC.
Jeremy Hylton <jeremy@alum.mit.edu>
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739 }
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740
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741 static int
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diff changeset
742 cm_clear(classmethod *cm)
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743 {
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744 Py_CLEAR(cm->cm_callable);
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745 Py_CLEAR(cm->cm_dict);
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746 return 0;
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747 }
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748
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749
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750 static PyObject *
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751 cm_descr_get(PyObject *self, PyObject *obj, PyObject *type)
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752 {
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753 classmethod *cm = (classmethod *)self;
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754
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755 if (cm->cm_callable == NULL) {
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756 PyErr_SetString(PyExc_RuntimeError,
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757 "uninitialized classmethod object");
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758 return NULL;
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759 }
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760 if (type == NULL)
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761 type = (PyObject *)(Py_TYPE(obj));
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762 return PyMethod_New(cm->cm_callable, type);
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763 }
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764
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765 static int
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766 cm_init(PyObject *self, PyObject *args, PyObject *kwds)
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767 {
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768 classmethod *cm = (classmethod *)self;
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769 PyObject *callable;
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770
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771 if (!PyArg_UnpackTuple(args, "classmethod", 1, 1, &callable))
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772 return -1;
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773 if (!_PyArg_NoKeywords("classmethod", kwds))
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774 return -1;
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775 Py_INCREF(callable);
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776 cm->cm_callable = callable;
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777 return 0;
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778 }
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779
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Raymond Hettinger <python@rcn.com>
parents: 51271
diff changeset
780 static PyMemberDef cm_memberlist[] = {
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781 {"__func__", T_OBJECT, offsetof(classmethod, cm_callable), READONLY},
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782 {NULL} /* Sentinel */
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783 };
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diff changeset
784
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785 static PyObject *
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786 cm_get___isabstractmethod__(classmethod *cm, void *closure)
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787 {
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788 int res = _PyObject_IsAbstract(cm->cm_callable);
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789 if (res == -1) {
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790 return NULL;
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791 }
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diff changeset
792 else if (res) {
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793 Py_RETURN_TRUE;
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794 }
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795 Py_RETURN_FALSE;
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796 }
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797
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798 static PyGetSetDef cm_getsetlist[] = {
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799 {"__isabstractmethod__",
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800 (getter)cm_get___isabstractmethod__, NULL,
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diff changeset
801 NULL,
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diff changeset
802 NULL},
75051
f029312764b4 use new generic __dict__ descriptor implementations
Benjamin Peterson <benjamin@python.org>
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diff changeset
803 {"__dict__", PyObject_GenericGetDict, PyObject_GenericSetDict, NULL, NULL},
73984
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804 {NULL} /* Sentinel */
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805 };
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diff changeset
806
23832
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Martin v. Löwis <martin@v.loewis.de>
parents: 22974
diff changeset
807 PyDoc_STRVAR(classmethod_doc,
21444
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diff changeset
808 "classmethod(function) -> method\n\
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809 \n\
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diff changeset
810 Convert a function to be a class method.\n\
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811 \n\
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parents: 21167
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812 A class method receives the class as implicit first argument,\n\
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813 just like an instance method receives the instance.\n\
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814 To declare a class method, use this idiom:\n\
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815 \n\
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816 class C:\n\
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817 def f(cls, arg1, arg2, ...): ...\n\
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818 f = classmethod(f)\n\
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819 \n\
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820 It can be called either on the class (e.g. C.f()) or on an instance\n\
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821 (e.g. C().f()). The instance is ignored except for its class.\n\
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diff changeset
822 If a class method is called for a derived class, the derived class\n\
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diff changeset
823 object is passed as the implied first argument.\n\
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77c7476f41bd Portability fix: Not every compiler implements the extension of
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diff changeset
824 \n\
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825 Class methods are different than C++ or Java static methods.\n\
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826 If you want those, see the staticmethod builtin.");
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827
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828 PyTypeObject PyClassMethod_Type = {
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829 PyVarObject_HEAD_INIT(&PyType_Type, 0)
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830 "classmethod",
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831 sizeof(classmethod),
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832 0,
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833 (destructor)cm_dealloc, /* tp_dealloc */
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834 0, /* tp_print */
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835 0, /* tp_getattr */
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836 0, /* tp_setattr */
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837 0, /* tp_reserved */
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838 0, /* tp_repr */
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839 0, /* tp_as_number */
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840 0, /* tp_as_sequence */
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841 0, /* tp_as_mapping */
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842 0, /* tp_hash */
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843 0, /* tp_call */
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844 0, /* tp_str */
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845 0, /* tp_getattro */
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846 0, /* tp_setattro */
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847 0, /* tp_as_buffer */
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848 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC,
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849 classmethod_doc, /* tp_doc */
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850 (traverseproc)cm_traverse, /* tp_traverse */
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851 (inquiry)cm_clear, /* tp_clear */
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852 0, /* tp_richcompare */
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853 0, /* tp_weaklistoffset */
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854 0, /* tp_iter */
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855 0, /* tp_iternext */
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856 0, /* tp_methods */
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857 cm_memberlist, /* tp_members */
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858 cm_getsetlist, /* tp_getset */
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859 0, /* tp_base */
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860 0, /* tp_dict */
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861 cm_descr_get, /* tp_descr_get */
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862 0, /* tp_descr_set */
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863 offsetof(classmethod, cm_dict), /* tp_dictoffset */
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864 cm_init, /* tp_init */
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865 PyType_GenericAlloc, /* tp_alloc */
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866 PyType_GenericNew, /* tp_new */
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867 PyObject_GC_Del, /* tp_free */
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868 };
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869
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870 PyObject *
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871 PyClassMethod_New(PyObject *callable)
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872 {
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873 classmethod *cm = (classmethod *)
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874 PyType_GenericAlloc(&PyClassMethod_Type, 0);
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875 if (cm != NULL) {
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876 Py_INCREF(callable);
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877 cm->cm_callable = callable;
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878 }
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879 return (PyObject *)cm;
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880 }
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881
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882
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883 /* Static method object */
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884
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885 /* A static method does not receive an implicit first argument.
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886 To declare a static method, use this idiom:
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887
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888 class C:
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889 def f(arg1, arg2, ...): ...
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890 f = staticmethod(f)
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891
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892 It can be called either on the class (e.g. C.f()) or on an instance
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893 (e.g. C().f()); the instance is ignored except for its class.
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894
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895 Static methods in Python are similar to those found in Java or C++.
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896 For a more advanced concept, see class methods above.
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897 */
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898
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899 typedef struct {
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900 PyObject_HEAD
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901 PyObject *sm_callable;
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902 PyObject *sm_dict;
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903 } staticmethod;
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904
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905 static void
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906 sm_dealloc(staticmethod *sm)
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907 {
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908 _PyObject_GC_UNTRACK((PyObject *)sm);
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909 Py_XDECREF(sm->sm_callable);
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910 Py_XDECREF(sm->sm_dict);
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911 Py_TYPE(sm)->tp_free((PyObject *)sm);
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912 }
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913
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914 static int
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915 sm_traverse(staticmethod *sm, visitproc visit, void *arg)
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916 {
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917 Py_VISIT(sm->sm_callable);
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918 Py_VISIT(sm->sm_dict);
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919 return 0;
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920 }
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921
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922 static int
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923 sm_clear(staticmethod *sm)
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924 {
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925 Py_CLEAR(sm->sm_callable);
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926 Py_CLEAR(sm->sm_dict);
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927 return 0;
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928 }
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929
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930 static PyObject *
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931 sm_descr_get(PyObject *self, PyObject *obj, PyObject *type)
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932 {
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933 staticmethod *sm = (staticmethod *)self;
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934
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935 if (sm->sm_callable == NULL) {
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936 PyErr_SetString(PyExc_RuntimeError,
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937 "uninitialized staticmethod object");
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938 return NULL;
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939 }
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940 Py_INCREF(sm->sm_callable);
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941 return sm->sm_callable;
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942 }
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943
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944 static int
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945 sm_init(PyObject *self, PyObject *args, PyObject *kwds)
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946 {
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947 staticmethod *sm = (staticmethod *)self;
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948 PyObject *callable;
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949
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950 if (!PyArg_UnpackTuple(args, "staticmethod", 1, 1, &callable))
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951 return -1;
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952 if (!_PyArg_NoKeywords("staticmethod", kwds))
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953 return -1;
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954 Py_INCREF(callable);
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955 sm->sm_callable = callable;
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956 return 0;
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957 }
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958
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959 static PyMemberDef sm_memberlist[] = {
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960 {"__func__", T_OBJECT, offsetof(staticmethod, sm_callable), READONLY},
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961 {NULL} /* Sentinel */
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962 };
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963
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964 static PyObject *
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965 sm_get___isabstractmethod__(staticmethod *sm, void *closure)
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966 {
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967 int res = _PyObject_IsAbstract(sm->sm_callable);
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968 if (res == -1) {
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969 return NULL;
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970 }
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971 else if (res) {
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972 Py_RETURN_TRUE;
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973 }
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974 Py_RETURN_FALSE;
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975 }
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976
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977 static PyGetSetDef sm_getsetlist[] = {
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978 {"__isabstractmethod__",
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979 (getter)sm_get___isabstractmethod__, NULL,
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980 NULL,
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981 NULL},
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982 {"__dict__", PyObject_GenericGetDict, PyObject_GenericSetDict, NULL, NULL},
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983 {NULL} /* Sentinel */
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984 };
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985
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986 PyDoc_STRVAR(staticmethod_doc,
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987 "staticmethod(function) -> method\n\
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988 \n\
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989 Convert a function to be a static method.\n\
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990 \n\
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991 A static method does not receive an implicit first argument.\n\
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992 To declare a static method, use this idiom:\n\
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993 \n\
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994 class C:\n\
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995 def f(arg1, arg2, ...): ...\n\
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996 f = staticmethod(f)\n\
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997 \n\
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998 It can be called either on the class (e.g. C.f()) or on an instance\n\
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999 (e.g. C().f()). The instance is ignored except for its class.\n\
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1000 \n\
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1001 Static methods in Python are similar to those found in Java or C++.\n\
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1002 For a more advanced concept, see the classmethod builtin.");
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1003
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1004 PyTypeObject PyStaticMethod_Type = {
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1005 PyVarObject_HEAD_INIT(&PyType_Type, 0)
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1006 "staticmethod",
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1007 sizeof(staticmethod),
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1008 0,
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1009 (destructor)sm_dealloc, /* tp_dealloc */
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1010 0, /* tp_print */
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1011 0, /* tp_getattr */
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1012 0, /* tp_setattr */
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1013 0, /* tp_reserved */
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1014 0, /* tp_repr */
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1015 0, /* tp_as_number */
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1016 0, /* tp_as_sequence */
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1017 0, /* tp_as_mapping */
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1018 0, /* tp_hash */
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1019 0, /* tp_call */
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1020 0, /* tp_str */
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1021 0, /* tp_getattro */
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1022 0, /* tp_setattro */
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1023 0, /* tp_as_buffer */
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1024 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC,
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1025 staticmethod_doc, /* tp_doc */
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1026 (traverseproc)sm_traverse, /* tp_traverse */
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1027 (inquiry)sm_clear, /* tp_clear */
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1028 0, /* tp_richcompare */
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1029 0, /* tp_weaklistoffset */
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1030 0, /* tp_iter */
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1031 0, /* tp_iternext */
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1032 0, /* tp_methods */
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1033 sm_memberlist, /* tp_members */
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1034 sm_getsetlist, /* tp_getset */
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1035 0, /* tp_base */
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1036 0, /* tp_dict */
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1037 sm_descr_get, /* tp_descr_get */
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1038 0, /* tp_descr_set */
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1039 offsetof(staticmethod, sm_dict), /* tp_dictoffset */
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1040 sm_init, /* tp_init */
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1041 PyType_GenericAlloc, /* tp_alloc */
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1042 PyType_GenericNew, /* tp_new */
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1043 PyObject_GC_Del, /* tp_free */
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1044 };
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1045
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1046 PyObject *
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1047 PyStaticMethod_New(PyObject *callable)
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1048 {
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1049 staticmethod *sm = (staticmethod *)
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1050 PyType_GenericAlloc(&PyStaticMethod_Type, 0);
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1051 if (sm != NULL) {
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1052 Py_INCREF(callable);
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1053 sm->sm_callable = callable;
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1054 }
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1055 return (PyObject *)sm;
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1056 }