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annotate Modules/xxmodule.c @ 15842:f6cd36498a50 legacy-trunk

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author Martin v. Löwis <martin@v.loewis.de>
date Sat, 13 Jan 2001 09:54:41 +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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16
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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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27
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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 }