Mercurial > cpython-lru_cache-weakref

annotate Objects/moduleobject.c @ 15164:8930ec3bc00a legacy-trunk

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Added additional test cases for pulldom modifications.
author Lars Gustäbel <lars@gustaebel.de>
date Wed, 11 Oct 2000 22:36:00 +0000
parents 6f6f965c5e2d
children 8aa947e1eee8
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
145
853b736a6a9e Added copyright notice.
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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 if (m->md_dict == NULL || nameobj == NULL)
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22 goto fail;
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23 if (PyDict_SetItemString(m->md_dict, "__name__", nameobj) != 0)
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24 goto fail;
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25 if (PyDict_SetItemString(m->md_dict, "__doc__", Py_None) != 0)
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26 goto fail;
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27 Py_DECREF(nameobj);
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28 return (PyObject *)m;
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29
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30 fail:
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31 Py_XDECREF(nameobj);
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32 Py_DECREF(m);
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33 return NULL;
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34 }
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35
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36 PyObject *
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37 PyModule_GetDict(PyObject *m)
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38 {
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39 if (!PyModule_Check(m)) {
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40 PyErr_BadInternalCall();
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41 return NULL;
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42 }
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43 return ((PyModuleObject *)m) -> md_dict;
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44 }
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45
43
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46 char *
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47 PyModule_GetName(PyObject *m)
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48 {
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49 PyObject *nameobj;
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50 if (!PyModule_Check(m)) {
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51 PyErr_BadArgument();
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52 return NULL;
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53 }
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54 nameobj = PyDict_GetItemString(((PyModuleObject *)m)->md_dict,
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55 "__name__");
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56 if (nameobj == NULL || !PyString_Check(nameobj)) {
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57 PyErr_SetString(PyExc_SystemError, "nameless module");
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58 return NULL;
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59 }
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60 return PyString_AsString(nameobj);
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61 }
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62
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63 char *
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64 PyModule_GetFilename(PyObject *m)
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65 {
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66 PyObject *fileobj;
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67 if (!PyModule_Check(m)) {
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68 PyErr_BadArgument();
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69 return NULL;
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70 }
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71 fileobj = PyDict_GetItemString(((PyModuleObject *)m)->md_dict,
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72 "__file__");
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73 if (fileobj == NULL || !PyString_Check(fileobj)) {
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74 PyErr_SetString(PyExc_SystemError, "module filename missing");
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75 return NULL;
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76 }
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77 return PyString_AsString(fileobj);
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78 }
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79
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80 void
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81 _PyModule_Clear(PyObject *m)
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82 {
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83 /* To make the execution order of destructors for global
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84 objects a bit more predictable, we first zap all objects
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85 whose name starts with a single underscore, before we clear
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86 the entire dictionary. We zap them by replacing them with
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87 None, rather than deleting them from the dictionary, to
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88 avoid rehashing the dictionary (to some extent). */
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89
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90 int pos;
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91 PyObject *key, *value;
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92 PyObject *d;
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93
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94 d = ((PyModuleObject *)m)->md_dict;
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95
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96 /* First, clear only names starting with a single underscore */
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97 pos = 0;
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98 while (PyDict_Next(d, &pos, &key, &value)) {
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99 if (value != Py_None && PyString_Check(key)) {
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100 char *s = PyString_AsString(key);
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101 if (s[0] == '_' && s[1] != '_') {
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102 if (Py_VerboseFlag > 1)
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103 PySys_WriteStderr("# clear[1] %s\n", s);
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104 PyDict_SetItem(d, key, Py_None);
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105 }
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106 }
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107 }
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108
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109 /* Next, clear all names except for __builtins__ */
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110 pos = 0;
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111 while (PyDict_Next(d, &pos, &key, &value)) {
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112 if (value != Py_None && PyString_Check(key)) {
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113 char *s = PyString_AsString(key);
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114 if (s[0] != '_' || strcmp(s, "__builtins__") != 0) {
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115 if (Py_VerboseFlag > 1)
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116 PySys_WriteStderr("# clear[2] %s\n", s);
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117 PyDict_SetItem(d, key, Py_None);
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118 }
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119 }
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120 }
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121
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122 /* Note: we leave __builtins__ in place, so that destructors
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123 of non-global objects defined in this module can still use
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124 builtins, in particularly 'None'. */
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125
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126 }
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127
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128 /* Methods */
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129
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130 static void
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131 module_dealloc(PyModuleObject *m)
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132 {
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133 if (m->md_dict != NULL) {
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134 _PyModule_Clear((PyObject *)m);
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135 Py_DECREF(m->md_dict);
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136 }
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1c7c2dd1beb1 Vladimir Marangozov's long-awaited malloc restructuring.
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137 PyObject_DEL(m);
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138 }
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139
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140 static PyObject *
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141 module_repr(PyModuleObject *m)
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142 {
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143 char buf[400];
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144 char *name;
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145 char *filename;
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146 name = PyModule_GetName((PyObject *)m);
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147 if (name == NULL) {
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148 PyErr_Clear();
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149 name = "?";
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150 }
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151 filename = PyModule_GetFilename((PyObject *)m);
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152 if (filename == NULL) {
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153 PyErr_Clear();
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154 sprintf(buf, "<module '%.80s' (built-in)>", name);
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155 } else {
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156 sprintf(buf, "<module '%.80s' from '%.255s'>", name, filename);
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157 }
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158
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159 return PyString_FromString(buf);
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160 }
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161
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162 static PyObject *
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163 module_getattr(PyModuleObject *m, char *name)
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164 {
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165 PyObject *res;
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166 if (strcmp(name, "__dict__") == 0) {
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167 Py_INCREF(m->md_dict);
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168 return m->md_dict;
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169 }
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170 res = PyDict_GetItemString(m->md_dict, name);
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171 if (res == NULL)
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172 PyErr_SetString(PyExc_AttributeError, name);
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173 else
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174 Py_INCREF(res);
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175 return res;
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176 }
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177
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178 static int
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179 module_setattr(PyModuleObject *m, char *name, PyObject *v)
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180 {
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181 if (name[0] == '_' && strcmp(name, "__dict__") == 0) {
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182 PyErr_SetString(PyExc_TypeError,
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183 "read-only special attribute");
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184 return -1;
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185 }
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186 if (v == NULL) {
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187 int rv = PyDict_DelItemString(m->md_dict, name);
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188 if (rv < 0)
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189 PyErr_SetString(PyExc_AttributeError,
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190 "delete non-existing module attribute");
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191 return rv;
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192 }
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193 else
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194 return PyDict_SetItemString(m->md_dict, name, v);
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195 }
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196
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197 PyTypeObject PyModule_Type = {
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198 PyObject_HEAD_INIT(&PyType_Type)
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199 0, /*ob_size*/
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200 "module", /*tp_name*/
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201 sizeof(PyModuleObject), /*tp_size*/
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202 0, /*tp_itemsize*/
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203 (destructor)module_dealloc, /*tp_dealloc*/
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204 0, /*tp_print*/
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205 (getattrfunc)module_getattr, /*tp_getattr*/
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206 (setattrfunc)module_setattr, /*tp_setattr*/
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207 0, /*tp_compare*/
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208 (reprfunc)module_repr, /*tp_repr*/
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209 };