Mercurial > cpython-lru_cache-weakref

annotate Objects/moduleobject.c @ 11239:577ea261bdf2 legacy-trunk

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Find the help.txt file relative to __file__ or ".", not in sys.path. (Suggested by Moshe Zadka, but implemented differently.) Add <<python-docs>> event which, on Unix, brings up Netscape pointing to http://www.python.doc/current/ (a local copy would be nice but its location can't be predicted). Windows solution TBD.
author Guido van Rossum <guido@python.org>
date Thu, 26 Aug 1999 23:06:05 +0000
parents 5c1ebf23f1d7
children 1c7c2dd1beb1
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /***********************************************************
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2 Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
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3 The Netherlands.
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4
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5 All Rights Reserved
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6
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7 Permission to use, copy, modify, and distribute this software and its
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8 documentation for any purpose and without fee is hereby granted,
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9 provided that the above copyright notice appear in all copies and that
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10 both that copyright notice and this permission notice appear in
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11 supporting documentation, and that the names of Stichting Mathematisch
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12 Centrum or CWI or Corporation for National Research Initiatives or
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13 CNRI not be used in advertising or publicity pertaining to
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14 distribution of the software without specific, written prior
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15 permission.
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16
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17 While CWI is the initial source for this software, a modified version
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18 is made available by the Corporation for National Research Initiatives
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19 (CNRI) at the Internet address ftp://ftp.python.org.
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20
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21 STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
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22 REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
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23 MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
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24 CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
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25 DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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26 PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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27 TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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28 PERFORMANCE OF THIS SOFTWARE.
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29
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30 ******************************************************************/
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31
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32 /* Module object implementation */
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33
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34 #include "Python.h"
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35
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36 typedef struct {
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37 PyObject_HEAD
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38 PyObject *md_dict;
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39 } PyModuleObject;
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40
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41 PyObject *
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42 PyModule_New(name)
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43 char *name;
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44 {
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45 PyModuleObject *m;
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46 PyObject *nameobj;
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47 m = PyObject_NEW(PyModuleObject, &PyModule_Type);
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48 if (m == NULL)
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49 return NULL;
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50 nameobj = PyString_FromString(name);
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51 m->md_dict = PyDict_New();
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52 if (m->md_dict == NULL || nameobj == NULL)
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53 goto fail;
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54 if (PyDict_SetItemString(m->md_dict, "__name__", nameobj) != 0)
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55 goto fail;
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56 if (PyDict_SetItemString(m->md_dict, "__doc__", Py_None) != 0)
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57 goto fail;
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58 Py_DECREF(nameobj);
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59 return (PyObject *)m;
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60
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61 fail:
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62 Py_XDECREF(nameobj);
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63 Py_DECREF(m);
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64 return NULL;
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65 }
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66
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67 PyObject *
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68 PyModule_GetDict(m)
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69 PyObject *m;
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70 {
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71 if (!PyModule_Check(m)) {
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72 PyErr_BadInternalCall();
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73 return NULL;
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74 }
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75 return ((PyModuleObject *)m) -> md_dict;
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76 }
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77
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78 char *
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79 PyModule_GetName(m)
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80 PyObject *m;
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81 {
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82 PyObject *nameobj;
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83 if (!PyModule_Check(m)) {
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84 PyErr_BadArgument();
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85 return NULL;
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86 }
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87 nameobj = PyDict_GetItemString(((PyModuleObject *)m)->md_dict,
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88 "__name__");
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89 if (nameobj == NULL || !PyString_Check(nameobj)) {
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90 PyErr_SetString(PyExc_SystemError, "nameless module");
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91 return NULL;
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92 }
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93 return PyString_AsString(nameobj);
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94 }
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95
10161
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96 char *
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97 PyModule_GetFilename(m)
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98 PyObject *m;
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99 {
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100 PyObject *fileobj;
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101 if (!PyModule_Check(m)) {
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102 PyErr_BadArgument();
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103 return NULL;
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104 }
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105 fileobj = PyDict_GetItemString(((PyModuleObject *)m)->md_dict,
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106 "__file__");
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107 if (fileobj == NULL || !PyString_Check(fileobj)) {
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108 PyErr_SetString(PyExc_SystemError, "module filename missing");
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109 return NULL;
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110 }
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111 return PyString_AsString(fileobj);
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112 }
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113
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114 void
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115 _PyModule_Clear(m)
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116 PyObject *m;
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117 {
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118 /* To make the execution order of destructors for global
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119 objects a bit more predictable, we first zap all objects
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120 whose name starts with a single underscore, before we clear
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121 the entire dictionary. We zap them by replacing them with
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122 None, rather than deleting them from the dictionary, to
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123 avoid rehashing the dictionary (to some extent). */
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124
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125 int pos;
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126 PyObject *key, *value;
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127 PyObject *d;
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128
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129 d = ((PyModuleObject *)m)->md_dict;
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130
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131 /* First, clear only names starting with a single underscore */
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132 pos = 0;
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133 while (PyDict_Next(d, &pos, &key, &value)) {
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134 if (value != Py_None && PyString_Check(key)) {
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135 char *s = PyString_AsString(key);
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136 if (s[0] == '_' && s[1] != '_') {
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137 if (Py_VerboseFlag > 1)
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138 PySys_WriteStderr("# clear[1] %s\n", s);
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139 PyDict_SetItem(d, key, Py_None);
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140 }
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141 }
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142 }
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143
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144 /* Next, clear all names except for __builtins__ */
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145 pos = 0;
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146 while (PyDict_Next(d, &pos, &key, &value)) {
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147 if (value != Py_None && PyString_Check(key)) {
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148 char *s = PyString_AsString(key);
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149 if (s[0] != '_' || strcmp(s, "__builtins__") != 0) {
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150 if (Py_VerboseFlag > 1)
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151 PySys_WriteStderr("# clear[2] %s\n", s);
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152 PyDict_SetItem(d, key, Py_None);
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153 }
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154 }
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155 }
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156
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157 /* Note: we leave __builtins__ in place, so that destructors
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158 of non-global objects defined in this module can still use
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159 builtins, in particularly 'None'. */
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160
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161 }
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162
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163 /* Methods */
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164
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165 static void
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166 module_dealloc(m)
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167 PyModuleObject *m;
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168 {
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169 if (m->md_dict != NULL) {
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170 _PyModule_Clear((PyObject *)m);
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171 Py_DECREF(m->md_dict);
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172 }
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173 free((char *)m);
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174 }
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175
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176 static PyObject *
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177 module_repr(m)
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178 PyModuleObject *m;
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179 {
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180 char buf[400];
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181 char *name;
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182 char *filename;
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183 name = PyModule_GetName((PyObject *)m);
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184 if (name == NULL) {
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185 PyErr_Clear();
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186 name = "?";
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187 }
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188 filename = PyModule_GetFilename((PyObject *)m);
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189 if (filename == NULL) {
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190 PyErr_Clear();
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191 sprintf(buf, "<module '%.80s' (built-in)>", name);
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192 } else {
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193 sprintf(buf, "<module '%.80s' from '%.255s'>", name, filename);
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194 }
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195
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196 return PyString_FromString(buf);
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197 }
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198
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199 static PyObject *
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200 module_getattr(m, name)
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201 PyModuleObject *m;
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202 char *name;
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203 {
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204 PyObject *res;
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205 if (strcmp(name, "__dict__") == 0) {
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206 Py_INCREF(m->md_dict);
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207 return m->md_dict;
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208 }
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209 res = PyDict_GetItemString(m->md_dict, name);
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210 if (res == NULL)
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211 PyErr_SetString(PyExc_AttributeError, name);
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212 else
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213 Py_INCREF(res);
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214 return res;
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215 }
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216
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217 static int
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218 module_setattr(m, name, v)
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219 PyModuleObject *m;
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220 char *name;
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221 PyObject *v;
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222 {
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223 if (name[0] == '_' && strcmp(name, "__dict__") == 0) {
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224 PyErr_SetString(PyExc_TypeError,
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225 "read-only special attribute");
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226 return -1;
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227 }
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228 if (v == NULL) {
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229 int rv = PyDict_DelItemString(m->md_dict, name);
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230 if (rv < 0)
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231 PyErr_SetString(PyExc_AttributeError,
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232 "delete non-existing module attribute");
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233 return rv;
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234 }
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235 else
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236 return PyDict_SetItemString(m->md_dict, name, v);
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237 }
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238
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239 PyTypeObject PyModule_Type = {
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240 PyObject_HEAD_INIT(&PyType_Type)
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241 0, /*ob_size*/
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242 "module", /*tp_name*/
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243 sizeof(PyModuleObject), /*tp_size*/
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244 0, /*tp_itemsize*/
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245 (destructor)module_dealloc, /*tp_dealloc*/
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246 0, /*tp_print*/
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247 (getattrfunc)module_getattr, /*tp_getattr*/
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248 (setattrfunc)module_setattr, /*tp_setattr*/
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249 0, /*tp_compare*/
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250 (reprfunc)module_repr, /*tp_repr*/
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251 };