Mercurial > cpython-lru_cache-weakref

annotate Modules/xxmodule.c @ 16798:258dcafe2d0b legacy-trunk

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Gustavo Niemeyer <niemeyer@conectiva.com>: Fixed recno support (keys are integers rather than strings). Work around DB bug that cause stdin to be closed by rnopen() when the DB file needed to exist but did not (no longer segfaults). This closes SF tracker patch #403445. Also wrapped some long lines and added whitespace around operators -- FLD.
author Fred Drake <fdrake@acm.org>
date Tue, 27 Feb 2001 18:56:46 +0000
parents 6f6f965c5e2d
children b32d66a4b5e6
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1
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2 /* Use this file as a template to start implementing a module that
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3 also declares object types. All occurrences of 'Xxo' should be changed
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4 to something reasonable for your objects. After that, all other
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5 occurrences of 'xx' should be changed to something reasonable for your
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6 module. If your module is named foo your sourcefile should be named
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7 foomodule.c.
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8
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9 You will probably want to delete all references to 'x_attr' and add
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10 your own types of attributes instead. Maybe you want to name your
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11 local variables other than 'self'. If your object type is needed in
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12 other files, you'll have to create a file "foobarobject.h"; see
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13 intobject.h for an example. */
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14
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15 /* Xxo objects */
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17 #include "Python.h"
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18
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19 static PyObject *ErrorObject;
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20
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21 typedef struct {
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22 PyObject_HEAD
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23 PyObject *x_attr; /* Attributes dictionary */
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24 } XxoObject;
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25
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26 staticforward PyTypeObject Xxo_Type;
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28 #define XxoObject_Check(v) ((v)->ob_type == &Xxo_Type)
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30 static XxoObject *
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31 newXxoObject(PyObject *arg)
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32 {
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33 XxoObject *self;
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34 self = PyObject_New(XxoObject, &Xxo_Type);
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35 if (self == NULL)
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36 return NULL;
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37 self->x_attr = NULL;
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38 return self;
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39 }
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40
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41 /* Xxo methods */
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42
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43 static void
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44 Xxo_dealloc(XxoObject *self)
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45 {
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46 Py_XDECREF(self->x_attr);
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47 PyObject_Del(self);
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48 }
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49
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50 static PyObject *
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51 Xxo_demo(XxoObject *self, PyObject *args)
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52 {
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53 if (!PyArg_ParseTuple(args, ":demo"))
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54 return NULL;
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55 Py_INCREF(Py_None);
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56 return Py_None;
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57 }
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58
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59 static PyMethodDef Xxo_methods[] = {
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60 {"demo", (PyCFunction)Xxo_demo, METH_VARARGS},
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61 {NULL, NULL} /* sentinel */
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62 };
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64 static PyObject *
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65 Xxo_getattr(XxoObject *self, char *name)
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66 {
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67 if (self->x_attr != NULL) {
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68 PyObject *v = PyDict_GetItemString(self->x_attr, name);
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69 if (v != NULL) {
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70 Py_INCREF(v);
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71 return v;
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72 }
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73 }
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74 return Py_FindMethod(Xxo_methods, (PyObject *)self, name);
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75 }
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76
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77 static int
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78 Xxo_setattr(XxoObject *self, char *name, PyObject *v)
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79 {
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80 if (self->x_attr == NULL) {
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81 self->x_attr = PyDict_New();
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82 if (self->x_attr == NULL)
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83 return -1;
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84 }
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85 if (v == NULL) {
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86 int rv = PyDict_DelItemString(self->x_attr, name);
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87 if (rv < 0)
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88 PyErr_SetString(PyExc_AttributeError,
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89 "delete non-existing Xxo attribute");
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90 return rv;
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91 }
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92 else
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93 return PyDict_SetItemString(self->x_attr, name, v);
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94 }
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95
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96 statichere PyTypeObject Xxo_Type = {
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97 /* The ob_type field must be initialized in the module init function
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98 * to be portable to Windows without using C++. */
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99 PyObject_HEAD_INIT(NULL)
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100 0, /*ob_size*/
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101 "Xxo", /*tp_name*/
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102 sizeof(XxoObject), /*tp_basicsize*/
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103 0, /*tp_itemsize*/
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104 /* methods */
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105 (destructor)Xxo_dealloc, /*tp_dealloc*/
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106 0, /*tp_print*/
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107 (getattrfunc)Xxo_getattr, /*tp_getattr*/
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108 (setattrfunc)Xxo_setattr, /*tp_setattr*/
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109 0, /*tp_compare*/
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110 0, /*tp_repr*/
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111 0, /*tp_as_number*/
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112 0, /*tp_as_sequence*/
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113 0, /*tp_as_mapping*/
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114 0, /*tp_hash*/
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115 };
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116 /* --------------------------------------------------------------------- */
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117
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118 /* Function of two integers returning integer */
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119
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120 static PyObject *
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121 xx_foo(PyObject *self, PyObject *args)
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122 {
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123 long i, j;
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124 long res;
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125 if (!PyArg_ParseTuple(args, "ll:foo", &i, &j))
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126 return NULL;
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127 res = i+j; /* XXX Do something here */
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128 return PyInt_FromLong(res);
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129 }
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130
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131
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132 /* Function of no arguments returning new Xxo object */
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133
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134 static PyObject *
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135 xx_new(PyObject *self, PyObject *args)
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136 {
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137 XxoObject *rv;
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138
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139 if (!PyArg_ParseTuple(args, ":new"))
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140 return NULL;
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141 rv = newXxoObject(args);
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142 if ( rv == NULL )
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143 return NULL;
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144 return (PyObject *)rv;
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145 }
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146
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147 /* Example with subtle bug from extensions manual ("Thin Ice"). */
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148
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149 static PyObject *
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150 xx_bug(PyObject *self, PyObject *args)
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151 {
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152 PyObject *list, *item;
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153
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154 if (!PyArg_ParseTuple(args, "O:bug", &list))
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155 return NULL;
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156
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157 item = PyList_GetItem(list, 0);
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158 /* Py_INCREF(item); */
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159 PyList_SetItem(list, 1, PyInt_FromLong(0L));
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160 PyObject_Print(item, stdout, 0);
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161 printf("\n");
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162 /* Py_DECREF(item); */
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163
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164 Py_INCREF(Py_None);
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165 return Py_None;
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166 }
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167
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168 /* Test bad format character */
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169
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170 static PyObject *
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171 xx_roj(PyObject *self, PyObject *args)
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172 {
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173 PyObject *a;
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174 long b;
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175 if (!PyArg_ParseTuple(args, "O#:roj", &a, &b))
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176 return NULL;
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177 Py_INCREF(Py_None);
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178 return Py_None;
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179 }
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180
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181
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182 /* List of functions defined in the module */
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183
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184 static PyMethodDef xx_methods[] = {
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185 {"roj", xx_roj, METH_VARARGS},
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186 {"foo", xx_foo, METH_VARARGS},
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187 {"new", xx_new, METH_VARARGS},
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188 {"bug", xx_bug, METH_VARARGS},
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189 {NULL, NULL} /* sentinel */
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190 };
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191
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192
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193 /* Initialization function for the module (*must* be called initxx) */
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194
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195 DL_EXPORT(void)
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196 initxx(void)
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197 {
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198 PyObject *m, *d;
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199
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200 /* Initialize the type of the new type object here; doing it here
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201 * is required for portability to Windows without requiring C++. */
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202 Xxo_Type.ob_type = &PyType_Type;
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203
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204 /* Create the module and add the functions */
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205 m = Py_InitModule("xx", xx_methods);
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206
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207 /* Add some symbolic constants to the module */
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208 d = PyModule_GetDict(m);
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209 ErrorObject = PyErr_NewException("xx.error", NULL, NULL);
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210 PyDict_SetItemString(d, "error", ErrorObject);
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211 }