Mercurial > cpython-lru_cache-weakref

annotate Modules/xxmodule.c @ 80661:94de77bd0b4b 2.7

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Issue #16194: document imp.load_dynamic problems when read several extension modules from the same binary object file.
author Andrew Svetlov <andrew.svetlov@gmail.com>
date Thu, 29 Nov 2012 19:51:28 +0200
parents fd25030223b0
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 static PyTypeObject Xxo_Type;
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27
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28 #define XxoObject_Check(v) (Py_TYPE(v) == &Xxo_Type)
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29
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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 PyDoc_STR("demo() -> None")},
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62 {NULL, NULL} /* sentinel */
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63 };
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64
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65 static PyObject *
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66 Xxo_getattr(XxoObject *self, char *name)
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67 {
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68 if (self->x_attr != NULL) {
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69 PyObject *v = PyDict_GetItemString(self->x_attr, name);
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70 if (v != NULL) {
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71 Py_INCREF(v);
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72 return v;
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73 }
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74 }
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75 return Py_FindMethod(Xxo_methods, (PyObject *)self, name);
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76 }
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77
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78 static int
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79 Xxo_setattr(XxoObject *self, char *name, PyObject *v)
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80 {
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81 if (self->x_attr == NULL) {
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82 self->x_attr = PyDict_New();
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83 if (self->x_attr == NULL)
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84 return -1;
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85 }
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86 if (v == NULL) {
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87 int rv = PyDict_DelItemString(self->x_attr, name);
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88 if (rv < 0)
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89 PyErr_SetString(PyExc_AttributeError,
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90 "delete non-existing Xxo attribute");
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91 return rv;
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92 }
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93 else
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94 return PyDict_SetItemString(self->x_attr, name, v);
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95 }
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96
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97 static PyTypeObject Xxo_Type = {
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98 /* The ob_type field must be initialized in the module init function
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99 * to be portable to Windows without using C++. */
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100 PyVarObject_HEAD_INIT(NULL, 0)
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101 "xxmodule.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 0, /*tp_call*/
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116 0, /*tp_str*/
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117 0, /*tp_getattro*/
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118 0, /*tp_setattro*/
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119 0, /*tp_as_buffer*/
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120 Py_TPFLAGS_DEFAULT, /*tp_flags*/
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121 0, /*tp_doc*/
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122 0, /*tp_traverse*/
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123 0, /*tp_clear*/
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124 0, /*tp_richcompare*/
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125 0, /*tp_weaklistoffset*/
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126 0, /*tp_iter*/
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127 0, /*tp_iternext*/
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128 0, /*tp_methods*/
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129 0, /*tp_members*/
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130 0, /*tp_getset*/
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131 0, /*tp_base*/
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132 0, /*tp_dict*/
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133 0, /*tp_descr_get*/
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134 0, /*tp_descr_set*/
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135 0, /*tp_dictoffset*/
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136 0, /*tp_init*/
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137 0, /*tp_alloc*/
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138 0, /*tp_new*/
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139 0, /*tp_free*/
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140 0, /*tp_is_gc*/
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141 };
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142 /* --------------------------------------------------------------------- */
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143
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144 /* Function of two integers returning integer */
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145
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146 PyDoc_STRVAR(xx_foo_doc,
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147 "foo(i,j)\n\
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148 \n\
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149 Return the sum of i and j.");
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150
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151 static PyObject *
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152 xx_foo(PyObject *self, PyObject *args)
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153 {
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154 long i, j;
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155 long res;
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156 if (!PyArg_ParseTuple(args, "ll:foo", &i, &j))
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157 return NULL;
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158 res = i+j; /* XXX Do something here */
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159 return PyInt_FromLong(res);
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160 }
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161
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162
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163 /* Function of no arguments returning new Xxo object */
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164
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165 static PyObject *
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166 xx_new(PyObject *self, PyObject *args)
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167 {
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168 XxoObject *rv;
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169
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170 if (!PyArg_ParseTuple(args, ":new"))
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171 return NULL;
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172 rv = newXxoObject(args);
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173 if (rv == NULL)
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174 return NULL;
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175 return (PyObject *)rv;
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176 }
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177
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178 /* Example with subtle bug from extensions manual ("Thin Ice"). */
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179
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180 static PyObject *
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181 xx_bug(PyObject *self, PyObject *args)
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182 {
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183 PyObject *list, *item;
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184
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185 if (!PyArg_ParseTuple(args, "O:bug", &list))
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186 return NULL;
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187
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188 item = PyList_GetItem(list, 0);
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189 /* Py_INCREF(item); */
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190 PyList_SetItem(list, 1, PyInt_FromLong(0L));
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191 PyObject_Print(item, stdout, 0);
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192 printf("\n");
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193 /* Py_DECREF(item); */
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194
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195 Py_INCREF(Py_None);
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196 return Py_None;
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197 }
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198
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199 /* Test bad format character */
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200
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201 static PyObject *
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202 xx_roj(PyObject *self, PyObject *args)
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203 {
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204 PyObject *a;
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205 long b;
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206 if (!PyArg_ParseTuple(args, "O#:roj", &a, &b))
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207 return NULL;
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208 Py_INCREF(Py_None);
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209 return Py_None;
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210 }
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211
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212
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213 /* ---------- */
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214
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215 static PyTypeObject Str_Type = {
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216 /* The ob_type field must be initialized in the module init function
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217 * to be portable to Windows without using C++. */
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218 PyVarObject_HEAD_INIT(NULL, 0)
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219 "xxmodule.Str", /*tp_name*/
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220 0, /*tp_basicsize*/
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221 0, /*tp_itemsize*/
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222 /* methods */
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223 0, /*tp_dealloc*/
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224 0, /*tp_print*/
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225 0, /*tp_getattr*/
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226 0, /*tp_setattr*/
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227 0, /*tp_compare*/
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228 0, /*tp_repr*/
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229 0, /*tp_as_number*/
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230 0, /*tp_as_sequence*/
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231 0, /*tp_as_mapping*/
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232 0, /*tp_hash*/
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233 0, /*tp_call*/
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234 0, /*tp_str*/
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235 0, /*tp_getattro*/
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236 0, /*tp_setattro*/
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237 0, /*tp_as_buffer*/
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238 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /*tp_flags*/
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239 0, /*tp_doc*/
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240 0, /*tp_traverse*/
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241 0, /*tp_clear*/
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242 0, /*tp_richcompare*/
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243 0, /*tp_weaklistoffset*/
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244 0, /*tp_iter*/
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245 0, /*tp_iternext*/
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246 0, /*tp_methods*/
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247 0, /*tp_members*/
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248 0, /*tp_getset*/
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249 0, /* see initxx */ /*tp_base*/
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250 0, /*tp_dict*/
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251 0, /*tp_descr_get*/
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252 0, /*tp_descr_set*/
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253 0, /*tp_dictoffset*/
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254 0, /*tp_init*/
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255 0, /*tp_alloc*/
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256 0, /*tp_new*/
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257 0, /*tp_free*/
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258 0, /*tp_is_gc*/
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259 };
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260
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261 /* ---------- */
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262
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263 static PyObject *
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264 null_richcompare(PyObject *self, PyObject *other, int op)
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265 {
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266 Py_INCREF(Py_NotImplemented);
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267 return Py_NotImplemented;
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268 }
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269
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270 static PyTypeObject Null_Type = {
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271 /* The ob_type field must be initialized in the module init function
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272 * to be portable to Windows without using C++. */
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273 PyVarObject_HEAD_INIT(NULL, 0)
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274 "xxmodule.Null", /*tp_name*/
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275 0, /*tp_basicsize*/
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276 0, /*tp_itemsize*/
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277 /* methods */
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278 0, /*tp_dealloc*/
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279 0, /*tp_print*/
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280 0, /*tp_getattr*/
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281 0, /*tp_setattr*/
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282 0, /*tp_compare*/
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283 0, /*tp_repr*/
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284 0, /*tp_as_number*/
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285 0, /*tp_as_sequence*/
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286 0, /*tp_as_mapping*/
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287 0, /*tp_hash*/
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288 0, /*tp_call*/
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289 0, /*tp_str*/
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290 0, /*tp_getattro*/
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291 0, /*tp_setattro*/
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292 0, /*tp_as_buffer*/
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293 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /*tp_flags*/
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294 0, /*tp_doc*/
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295 0, /*tp_traverse*/
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296 0, /*tp_clear*/
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297 null_richcompare, /*tp_richcompare*/
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298 0, /*tp_weaklistoffset*/
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299 0, /*tp_iter*/
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300 0, /*tp_iternext*/
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301 0, /*tp_methods*/
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302 0, /*tp_members*/
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303 0, /*tp_getset*/
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304 0, /* see initxx */ /*tp_base*/
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305 0, /*tp_dict*/
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306 0, /*tp_descr_get*/
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307 0, /*tp_descr_set*/
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308 0, /*tp_dictoffset*/
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309 0, /*tp_init*/
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310 0, /*tp_alloc*/
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311 0, /* see initxx */ /*tp_new*/
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312 0, /*tp_free*/
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313 0, /*tp_is_gc*/
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314 };
88a42a7c238a Another dummy type.
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315
27823
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316
651d1123ed6e Add Str, a subclass of str.
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317 /* ---------- */
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318
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319
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320 /* List of functions defined in the module */
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321
3845
d19338fd38eb Converted to new style
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322 static PyMethodDef xx_methods[] = {
61463
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323 {"roj", xx_roj, METH_VARARGS,
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324 PyDoc_STR("roj(a,b) -> None")},
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325 {"foo", xx_foo, METH_VARARGS,
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326 xx_foo_doc},
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327 {"new", xx_new, METH_VARARGS,
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328 PyDoc_STR("new() -> new Xx object")},
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329 {"bug", xx_bug, METH_VARARGS,
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330 PyDoc_STR("bug(o) -> None")},
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331 {NULL, NULL} /* sentinel */
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332 };
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333
24804
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Skip Montanaro <skip@pobox.com>
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334 PyDoc_STRVAR(module_doc,
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335 "This is a template module just for instruction.");
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336
72aceed365d4 * Makefile adapted to changes below.
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337 /* Initialization function for the module (*must* be called initxx) */
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338
24471
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Mark Hammond <mhammond@skippinet.com.au>
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339 PyMODINIT_FUNC
13651
8a063423e0b7 Bunch of minor ANSIfications: 'void initfunc()' -> 'void initfunc(void)',
Thomas Wouters <thomas@python.org>
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340 initxx(void)
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341 {
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342 PyObject *m;
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343
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344 /* Due to cross platform compiler issues the slots must be filled
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345 * here. It's required for portability to Windows without requiring
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346 * C++. */
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347 Null_Type.tp_base = &PyBaseObject_Type;
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348 Null_Type.tp_new = PyType_GenericNew;
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349 Str_Type.tp_base = &PyUnicode_Type;
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Christian Heimes <christian@cheimes.de>
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350
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351 /* Finalize the type object including setting type of the new type
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352 * object; doing it here is required for portability, too. */
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353 if (PyType_Ready(&Xxo_Type) < 0)
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354 return;
10202
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Fred Drake <fdrake@acm.org>
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355
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356 /* Create the module and add the functions */
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357 m = Py_InitModule3("xx", xx_methods, module_doc);
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358 if (m == NULL)
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359 return;
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360
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361 /* Add some symbolic constants to the module */
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362 if (ErrorObject == NULL) {
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363 ErrorObject = PyErr_NewException("xx.error", NULL, NULL);
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364 if (ErrorObject == NULL)
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365 return;
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366 }
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367 Py_INCREF(ErrorObject);
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368 PyModule_AddObject(m, "error", ErrorObject);
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369
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370 /* Add Str */
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371 if (PyType_Ready(&Str_Type) < 0)
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372 return;
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373 PyModule_AddObject(m, "Str", (PyObject *)&Str_Type);
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374
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375 /* Add Null */
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376 if (PyType_Ready(&Null_Type) < 0)
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377 return;
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378 PyModule_AddObject(m, "Null", (PyObject *)&Null_Type);
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379 }