Mercurial > cpython-lru_cache-weakref

annotate Modules/xxmodule.c @ 5817:48b94de85bf3 legacy-trunk

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Extensive changes by AMK.
author Guido van Rossum <guido@python.org>
date Thu, 17 Jul 1997 16:29:42 +0000
parents 0c6c69b0d3e9
children 2c29b8982643
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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 /* Use this file as a template to start implementing a module that
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33 also declares objects types. All occurrences of 'Xxo' should be changed
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34 to something reasonable for your objects. After that, all other
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35 occurrences of 'xx' should be changed to something reasonable for your
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36 module. If your module is named foo your sourcefile should be named
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37 foomodule.c.
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38
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39 You will probably want to delete all references to 'x_attr' and add
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40 your own types of attributes instead. Maybe you want to name your
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41 local variables other than 'self'. If your object type is needed in
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42 other files, you'll have to create a file "foobarobject.h"; see
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43 intobject.h for an example. */
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44
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45 /* Xxo objects */
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46
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47 #include "Python.h"
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48
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49 static PyObject *ErrorObject;
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50
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51 typedef struct {
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52 PyObject_HEAD
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53 PyObject *x_attr; /* Attributes dictionary */
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54 } XxoObject;
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55
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56 staticforward PyTypeObject Xxo_Type;
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57
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58 #define XxoObject_Check(v) ((v)->ob_type == &Xxo_Type)
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59
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60 static XxoObject *
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61 newXxoObject(arg)
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62 PyObject *arg;
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63 {
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64 XxoObject *self;
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65 self = PyObject_NEW(XxoObject, &Xxo_Type);
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66 if (self == NULL)
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67 return NULL;
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68 self->x_attr = NULL;
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69 return self;
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70 }
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71
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72 /* Xxo methods */
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73
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74 static void
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75 Xxo_dealloc(self)
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76 XxoObject *self;
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77 {
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78 Py_XDECREF(self->x_attr);
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79 PyMem_DEL(self);
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80 }
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81
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82 static PyObject *
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83 Xxo_demo(self, args)
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84 XxoObject *self;
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85 PyObject *args;
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86 {
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87 if (!PyArg_ParseTuple(args, ""))
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88 return NULL;
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89 Py_INCREF(Py_None);
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90 return Py_None;
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91 }
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92
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93 static PyMethodDef Xxo_methods[] = {
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94 {"demo", (PyCFunction)Xxo_demo, 1},
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95 {NULL, NULL} /* sentinel */
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96 };
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97
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98 static PyObject *
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99 Xxo_getattr(self, name)
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100 XxoObject *self;
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101 char *name;
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102 {
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103 if (self->x_attr != NULL) {
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104 PyObject *v = PyDict_GetItemString(self->x_attr, name);
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105 if (v != NULL) {
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106 Py_INCREF(v);
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107 return v;
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108 }
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109 }
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110 return Py_FindMethod(Xxo_methods, (PyObject *)self, name);
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111 }
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112
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113 static int
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114 Xxo_setattr(self, name, v)
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115 XxoObject *self;
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116 char *name;
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117 PyObject *v;
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118 {
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119 if (self->x_attr == NULL) {
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120 self->x_attr = PyDict_New();
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121 if (self->x_attr == NULL)
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122 return -1;
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123 }
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124 if (v == NULL) {
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125 int rv = PyDict_DelItemString(self->x_attr, name);
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126 if (rv < 0)
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127 PyErr_SetString(PyExc_AttributeError,
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128 "delete non-existing Xxo attribute");
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129 return rv;
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130 }
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131 else
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132 return PyDict_SetItemString(self->x_attr, name, v);
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133 }
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134
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135 staticforward PyTypeObject Xxo_Type = {
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136 PyObject_HEAD_INIT(&PyType_Type)
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137 0, /*ob_size*/
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138 "Xxo", /*tp_name*/
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139 sizeof(XxoObject), /*tp_basicsize*/
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140 0, /*tp_itemsize*/
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141 /* methods */
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142 (destructor)Xxo_dealloc, /*tp_dealloc*/
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143 0, /*tp_print*/
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144 (getattrfunc)Xxo_getattr, /*tp_getattr*/
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145 (setattrfunc)Xxo_setattr, /*tp_setattr*/
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146 0, /*tp_compare*/
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147 0, /*tp_repr*/
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148 0, /*tp_as_number*/
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149 0, /*tp_as_sequence*/
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150 0, /*tp_as_mapping*/
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151 0, /*tp_hash*/
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152 };
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153 /* --------------------------------------------------------------------- */
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154
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155 /* Function of two integers returning integer */
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156
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157 static PyObject *
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158 xx_foo(self, args)
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159 PyObject *self; /* Not used */
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160 PyObject *args;
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161 {
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162 long i, j;
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163 long res;
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164 if (!PyArg_ParseTuple(args, "ll", &i, &j))
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165 return NULL;
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166 res = i+j; /* XXX Do something here */
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167 return PyInt_FromLong(res);
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168 }
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169
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170
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171 /* Function of no arguments returning new Xxo object */
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172
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173 static PyObject *
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174 xx_new(self, args)
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175 PyObject *self; /* Not used */
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176 PyObject *args;
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177 {
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178 XxoObject *rv;
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179
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180 if (!PyArg_ParseTuple(args, ""))
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181 return NULL;
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182 rv = newXxoObject(args);
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183 if ( rv == NULL )
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184 return NULL;
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185 return (PyObject *)rv;
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186 }
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187
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188 /* Example with subtle bug from extensions manual ("Thin Ice"). */
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189
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190 static PyObject *
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191 xx_bug(self, args)
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192 PyObject *self;
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193 PyObject *args;
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194 {
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195 PyObject *list, *item;
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196
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197 if (!PyArg_ParseTuple(args, "O", &list))
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198 return NULL;
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199
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200 item = PyList_GetItem(list, 0);
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201 /* Py_INCREF(item); */
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202 PyList_SetItem(list, 1, PyInt_FromLong(0L));
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203 PyObject_Print(item, stdout, 0);
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204 printf("\n");
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205 /* Py_DECREF(item); */
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206
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207 Py_INCREF(Py_None);
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208 return Py_None;
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209 }
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210
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211
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212 /* List of functions defined in the module */
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213
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214 static PyMethodDef xx_methods[] = {
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215 {"foo", xx_foo, 1},
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216 {"new", xx_new, 1},
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217 {"bug", xx_bug, 1},
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218 {NULL, NULL} /* sentinel */
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219 };
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220
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221
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222 /* Initialization function for the module (*must* be called initxx) */
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223
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224 void
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225 initxx()
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226 {
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227 PyObject *m, *d;
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228
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229 /* Create the module and add the functions */
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230 m = Py_InitModule("xx", xx_methods);
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231
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232 /* Add some symbolic constants to the module */
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233 d = PyModule_GetDict(m);
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234 ErrorObject = PyString_FromString("xx.error");
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235 PyDict_SetItemString(d, "error", ErrorObject);
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236
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237 /* Check for errors */
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238 if (PyErr_Occurred())
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239 Py_FatalError("can't initialize module xx");
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240 }