Mercurial > cpython-lru_cache-weakref

annotate Objects/moduleobject.c @ 18572:9b8564f6e34d legacy-trunk

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Remove comments about XML and HTML; those sections are no longer part of this chapter. Minor change to match the style guide.
author Fred Drake <fdrake@acm.org>
date Sat, 14 Jul 2001 02:44:43 +0000
parents 222767eb28f7
children 09df3254b49d
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rev   line source
145
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1
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2 /* Module object implementation */
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3
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4 #include "Python.h"
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5
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6 typedef struct {
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7 PyObject_HEAD
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8 PyObject *md_dict;
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9 } PyModuleObject;
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10
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11 PyObject *
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12 PyModule_New(char *name)
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13 {
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14 PyModuleObject *m;
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15 PyObject *nameobj;
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16 m = PyObject_NEW(PyModuleObject, &PyModule_Type);
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17 if (m == NULL)
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18 return NULL;
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19 nameobj = PyString_FromString(name);
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20 m->md_dict = PyDict_New();
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21 PyObject_GC_Init(m);
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22 if (m->md_dict == NULL || nameobj == NULL)
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23 goto fail;
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24 if (PyDict_SetItemString(m->md_dict, "__name__", nameobj) != 0)
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25 goto fail;
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26 if (PyDict_SetItemString(m->md_dict, "__doc__", Py_None) != 0)
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27 goto fail;
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28 Py_DECREF(nameobj);
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29 return (PyObject *)m;
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30
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31 fail:
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32 Py_XDECREF(nameobj);
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33 Py_DECREF(m);
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34 return NULL;
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35 }
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36
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37 PyObject *
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38 PyModule_GetDict(PyObject *m)
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39 {
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40 if (!PyModule_Check(m)) {
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41 PyErr_BadInternalCall();
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42 return NULL;
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43 }
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44 return ((PyModuleObject *)m) -> md_dict;
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45 }
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46
43
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47 char *
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48 PyModule_GetName(PyObject *m)
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49 {
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50 PyObject *nameobj;
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51 if (!PyModule_Check(m)) {
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52 PyErr_BadArgument();
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53 return NULL;
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54 }
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55 nameobj = PyDict_GetItemString(((PyModuleObject *)m)->md_dict,
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56 "__name__");
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57 if (nameobj == NULL || !PyString_Check(nameobj)) {
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58 PyErr_SetString(PyExc_SystemError, "nameless module");
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59 return NULL;
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60 }
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61 return PyString_AsString(nameobj);
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62 }
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63
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64 char *
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65 PyModule_GetFilename(PyObject *m)
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66 {
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67 PyObject *fileobj;
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68 if (!PyModule_Check(m)) {
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69 PyErr_BadArgument();
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70 return NULL;
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71 }
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72 fileobj = PyDict_GetItemString(((PyModuleObject *)m)->md_dict,
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73 "__file__");
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74 if (fileobj == NULL || !PyString_Check(fileobj)) {
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75 PyErr_SetString(PyExc_SystemError, "module filename missing");
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76 return NULL;
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77 }
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78 return PyString_AsString(fileobj);
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79 }
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80
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81 void
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82 _PyModule_Clear(PyObject *m)
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83 {
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84 /* To make the execution order of destructors for global
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85 objects a bit more predictable, we first zap all objects
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86 whose name starts with a single underscore, before we clear
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87 the entire dictionary. We zap them by replacing them with
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88 None, rather than deleting them from the dictionary, to
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89 avoid rehashing the dictionary (to some extent). */
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90
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91 int pos;
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92 PyObject *key, *value;
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93 PyObject *d;
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94
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95 d = ((PyModuleObject *)m)->md_dict;
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96
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97 /* First, clear only names starting with a single underscore */
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98 pos = 0;
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99 while (PyDict_Next(d, &pos, &key, &value)) {
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100 if (value != Py_None && PyString_Check(key)) {
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101 char *s = PyString_AsString(key);
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102 if (s[0] == '_' && s[1] != '_') {
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103 if (Py_VerboseFlag > 1)
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104 PySys_WriteStderr("# clear[1] %s\n", s);
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105 PyDict_SetItem(d, key, Py_None);
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106 }
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107 }
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108 }
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109
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110 /* Next, clear all names except for __builtins__ */
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111 pos = 0;
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112 while (PyDict_Next(d, &pos, &key, &value)) {
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113 if (value != Py_None && PyString_Check(key)) {
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114 char *s = PyString_AsString(key);
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115 if (s[0] != '_' || strcmp(s, "__builtins__") != 0) {
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116 if (Py_VerboseFlag > 1)
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117 PySys_WriteStderr("# clear[2] %s\n", s);
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118 PyDict_SetItem(d, key, Py_None);
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119 }
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120 }
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121 }
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122
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123 /* Note: we leave __builtins__ in place, so that destructors
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124 of non-global objects defined in this module can still use
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125 builtins, in particularly 'None'. */
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126
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127 }
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128
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129 /* Methods */
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130
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131 static void
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132 module_dealloc(PyModuleObject *m)
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133 {
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134 PyObject_GC_Fini(m);
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135 if (m->md_dict != NULL) {
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136 _PyModule_Clear((PyObject *)m);
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137 Py_DECREF(m->md_dict);
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138 }
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139 PyObject_DEL(PyObject_AS_GC(m));
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140 }
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141
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142 static PyObject *
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143 module_repr(PyModuleObject *m)
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144 {
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145 char buf[400];
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146 char *name;
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147 char *filename;
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148 name = PyModule_GetName((PyObject *)m);
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149 if (name == NULL) {
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150 PyErr_Clear();
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151 name = "?";
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152 }
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153 filename = PyModule_GetFilename((PyObject *)m);
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154 if (filename == NULL) {
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155 PyErr_Clear();
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156 sprintf(buf, "<module '%.80s' (built-in)>", name);
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157 } else {
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158 sprintf(buf, "<module '%.80s' from '%.255s'>", name, filename);
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159 }
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160
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161 return PyString_FromString(buf);
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162 }
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163
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164 static PyObject *
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165 module_getattro(PyModuleObject *m, PyObject *name)
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166 {
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167 PyObject *res;
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168 char *sname = PyString_AsString(name);
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169
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170 if (sname[0] == '_' && strcmp(sname, "__dict__") == 0) {
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171 Py_INCREF(m->md_dict);
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172 return m->md_dict;
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173 }
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174 res = PyDict_GetItem(m->md_dict, name);
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175 if (res == NULL) {
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176 char *modname = PyModule_GetName((PyObject *)m);
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177 if (modname == NULL) {
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178 PyErr_Clear();
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179 modname = "?";
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180 }
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181 PyErr_Format(PyExc_AttributeError,
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182 "'%.50s' module has no attribute '%.400s'",
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183 modname, sname);
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184 }
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185 else
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186 Py_INCREF(res);
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187 return res;
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188 }
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189
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190 static int
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191 module_setattro(PyModuleObject *m, PyObject *name, PyObject *v)
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192 {
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193 char *sname = PyString_AsString(name);
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194 if (sname[0] == '_' && strcmp(sname, "__dict__") == 0) {
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195 PyErr_SetString(PyExc_TypeError,
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196 "read-only special attribute");
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197 return -1;
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198 }
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199 if (v == NULL) {
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200 int rv = PyDict_DelItem(m->md_dict, name);
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201 if (rv < 0) {
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202 char *modname = PyModule_GetName((PyObject *)m);
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203 if (modname == NULL) {
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204 PyErr_Clear();
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205 modname = "?";
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206 }
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207 PyErr_Format(PyExc_AttributeError,
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208 "'%.50s' module has no attribute '%.400s'",
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209 modname, sname);
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210 }
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211 return rv;
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212 }
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213 else
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214 return PyDict_SetItem(m->md_dict, name, v);
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215 }
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216
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217 /* We only need a traverse function, no clear function: If the module
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218 is in a cycle, md_dict will be cleared as well, which will break
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219 the cycle. */
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220 static int
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221 module_traverse(PyModuleObject *m, visitproc visit, void *arg)
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222 {
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223 if (m->md_dict != NULL)
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224 return visit(m->md_dict, arg);
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225 return 0;
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226 }
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227
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228 PyTypeObject PyModule_Type = {
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229 PyObject_HEAD_INIT(&PyType_Type)
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230 0, /* ob_size */
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231 "module", /* tp_name */
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232 sizeof(PyModuleObject) + PyGC_HEAD_SIZE,/* tp_size */
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233 0, /* tp_itemsize */
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234 (destructor)module_dealloc, /* tp_dealloc */
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235 0, /* tp_print */
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236 0, /* tp_getattr */
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237 0, /* tp_setattr */
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238 0, /* tp_compare */
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239 (reprfunc)module_repr, /* tp_repr */
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240 0, /* tp_as_number */
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241 0, /* tp_as_sequence */
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242 0, /* tp_as_mapping */
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243 0, /* tp_hash */
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244 0, /* tp_call */
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245 0, /* tp_str */
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246 (getattrofunc)module_getattro, /* tp_getattro */
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247 (setattrofunc)module_setattro, /* tp_setattro */
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248 0, /* tp_as_buffer */
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249 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_GC, /* tp_flags */
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250 0, /* tp_doc */
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251 (traverseproc)module_traverse, /* tp_traverse */
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252 };