Mercurial > cpython-lru_cache-weakref

annotate Objects/namespaceobject.c @ 80779:10d04bdb05ab 3.3

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Issue #16248: Disable code execution from the user's home directory by tkinter when the -E flag is passed to Python. Patch by Zachary Ware.
author Antoine Pitrou <solipsis@pitrou.net>
date Sun, 09 Dec 2012 14:46:46 +0100
parents c5124145e79e
children 3b93ab8c9c20
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
77339
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1 /* namespace object implementation */
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2
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3 #include "Python.h"
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4 #include "structmember.h"
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5
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6
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7 typedef struct {
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8 PyObject_HEAD
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9 PyObject *ns_dict;
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10 } _PyNamespaceObject;
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11
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12
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13 static PyMemberDef namespace_members[] = {
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14 {"__dict__", T_OBJECT, offsetof(_PyNamespaceObject, ns_dict), READONLY},
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15 {NULL}
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16 };
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17
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18
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19 /* Methods */
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20
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21 static PyObject *
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22 namespace_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
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23 {
79776
c5124145e79e Close #16160: Subclass support now works for types.SimpleNamespace. Thanks to RDM for noticing.
Eric Snow <ericsnowcurrently@gmail.com>
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24 PyObject *self;
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25
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c5124145e79e Close #16160: Subclass support now works for types.SimpleNamespace. Thanks to RDM for noticing.
Eric Snow <ericsnowcurrently@gmail.com>
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26 assert(type != NULL && type->tp_alloc != NULL);
c5124145e79e Close #16160: Subclass support now works for types.SimpleNamespace. Thanks to RDM for noticing.
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27 self = type->tp_alloc(type, 0);
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28 if (self != NULL) {
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29 _PyNamespaceObject *ns = (_PyNamespaceObject *)self;
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30 ns->ns_dict = PyDict_New();
c5124145e79e Close #16160: Subclass support now works for types.SimpleNamespace. Thanks to RDM for noticing.
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31 if (ns->ns_dict == NULL) {
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32 Py_DECREF(ns);
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33 return NULL;
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34 }
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35 }
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36 return self;
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37 }
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38
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39
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40 static int
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41 namespace_init(_PyNamespaceObject *ns, PyObject *args, PyObject *kwds)
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42 {
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43 /* ignore args if it's NULL or empty */
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44 if (args != NULL) {
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45 Py_ssize_t argcount = PyObject_Size(args);
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46 if (argcount < 0)
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47 return argcount;
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48 else if (argcount > 0) {
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49 PyErr_Format(PyExc_TypeError, "no positional arguments expected");
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50 return -1;
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51 }
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52 }
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53 if (kwds == NULL)
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54 return 0;
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55 return PyDict_Update(ns->ns_dict, kwds);
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56 }
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57
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58
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59 static void
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60 namespace_dealloc(_PyNamespaceObject *ns)
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61 {
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62 PyObject_GC_UnTrack(ns);
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63 Py_CLEAR(ns->ns_dict);
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64 Py_TYPE(ns)->tp_free((PyObject *)ns);
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65 }
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66
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67
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68 static PyObject *
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69 namespace_repr(_PyNamespaceObject *ns)
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70 {
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71 int i, loop_error = 0;
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72 PyObject *pairs = NULL, *d = NULL, *keys = NULL, *keys_iter = NULL;
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73 PyObject *key;
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74 PyObject *separator, *pairsrepr, *repr = NULL;
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75
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76 i = Py_ReprEnter((PyObject *)ns);
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77 if (i != 0) {
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78 return i > 0 ? PyUnicode_FromString("namespace(...)") : NULL;
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79 }
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80
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81 pairs = PyList_New(0);
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82 if (pairs == NULL)
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83 goto error;
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84
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85 d = ((_PyNamespaceObject *)ns)->ns_dict;
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86 assert(d != NULL);
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87 Py_INCREF(d);
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88
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89 keys = PyDict_Keys(d);
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90 if (keys == NULL)
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91 goto error;
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92 if (PyList_Sort(keys) != 0)
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93 goto error;
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94
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95 keys_iter = PyObject_GetIter(keys);
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96 if (keys_iter == NULL)
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97 goto error;
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98
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99 while ((key = PyIter_Next(keys_iter)) != NULL) {
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100 if (PyUnicode_Check(key) && PyUnicode_GET_SIZE(key) > 0) {
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101 PyObject *value, *item;
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102
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103 value = PyDict_GetItem(d, key);
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104 assert(value != NULL);
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105
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106 item = PyUnicode_FromFormat("%S=%R", key, value);
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107 if (item == NULL) {
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108 loop_error = 1;
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109 }
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110 else {
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111 loop_error = PyList_Append(pairs, item);
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112 Py_DECREF(item);
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113 }
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114 }
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115
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116 Py_DECREF(key);
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117 if (loop_error)
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118 goto error;
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119 }
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120
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121 separator = PyUnicode_FromString(", ");
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122 if (separator == NULL)
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123 goto error;
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124
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125 pairsrepr = PyUnicode_Join(separator, pairs);
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126 Py_DECREF(separator);
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127 if (pairsrepr == NULL)
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128 goto error;
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129
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130 repr = PyUnicode_FromFormat("%s(%S)",
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131 ((PyObject *)ns)->ob_type->tp_name, pairsrepr);
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132 Py_DECREF(pairsrepr);
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133
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134 error:
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135 Py_XDECREF(pairs);
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136 Py_XDECREF(d);
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137 Py_XDECREF(keys);
9c445f4695c1 Eric Snow's implementation of PEP 421.
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138 Py_XDECREF(keys_iter);
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139 Py_ReprLeave((PyObject *)ns);
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140
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141 return repr;
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142 }
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143
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144
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145 static int
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146 namespace_traverse(_PyNamespaceObject *ns, visitproc visit, void *arg)
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147 {
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148 Py_VISIT(ns->ns_dict);
9c445f4695c1 Eric Snow's implementation of PEP 421.
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149 return 0;
9c445f4695c1 Eric Snow's implementation of PEP 421.
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150 }
9c445f4695c1 Eric Snow's implementation of PEP 421.
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151
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152
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153 static int
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154 namespace_clear(_PyNamespaceObject *ns)
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155 {
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Barry Warsaw <barry@python.org>
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156 Py_CLEAR(ns->ns_dict);
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157 return 0;
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158 }
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159
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160
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161 PyDoc_STRVAR(namespace_doc,
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162 "A simple attribute-based namespace.\n\
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163 \n\
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164 namespace(**kwargs)");
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165
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166 PyTypeObject _PyNamespace_Type = {
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167 PyVarObject_HEAD_INIT(&PyType_Type, 0)
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168 "namespace", /* tp_name */
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169 sizeof(_PyNamespaceObject), /* tp_size */
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170 0, /* tp_itemsize */
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171 (destructor)namespace_dealloc, /* tp_dealloc */
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172 0, /* tp_print */
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173 0, /* tp_getattr */
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174 0, /* tp_setattr */
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175 0, /* tp_reserved */
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176 (reprfunc)namespace_repr, /* tp_repr */
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177 0, /* tp_as_number */
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178 0, /* tp_as_sequence */
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179 0, /* tp_as_mapping */
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180 0, /* tp_hash */
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181 0, /* tp_call */
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182 0, /* tp_str */
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183 PyObject_GenericGetAttr, /* tp_getattro */
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184 PyObject_GenericSetAttr, /* tp_setattro */
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185 0, /* tp_as_buffer */
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186 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
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187 Py_TPFLAGS_BASETYPE, /* tp_flags */
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188 namespace_doc, /* tp_doc */
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189 (traverseproc)namespace_traverse, /* tp_traverse */
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190 (inquiry)namespace_clear, /* tp_clear */
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191 0, /* tp_richcompare */
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192 0, /* tp_weaklistoffset */
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193 0, /* tp_iter */
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194 0, /* tp_iternext */
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195 0, /* tp_methods */
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196 namespace_members, /* tp_members */
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197 0, /* tp_getset */
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198 0, /* tp_base */
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199 0, /* tp_dict */
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200 0, /* tp_descr_get */
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201 0, /* tp_descr_set */
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202 offsetof(_PyNamespaceObject, ns_dict), /* tp_dictoffset */
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203 (initproc)namespace_init, /* tp_init */
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204 PyType_GenericAlloc, /* tp_alloc */
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205 (newfunc)namespace_new, /* tp_new */
9c445f4695c1 Eric Snow's implementation of PEP 421.
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206 PyObject_GC_Del, /* tp_free */
9c445f4695c1 Eric Snow's implementation of PEP 421.
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207 };
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208
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209
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210 PyObject *
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211 _PyNamespace_New(PyObject *kwds)
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212 {
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213 PyObject *ns = namespace_new(&_PyNamespace_Type, NULL, NULL);
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214 if (ns == NULL)
9c445f4695c1 Eric Snow's implementation of PEP 421.
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215 return NULL;
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216
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217 if (kwds == NULL)
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218 return ns;
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219 if (PyDict_Update(((_PyNamespaceObject *)ns)->ns_dict, kwds) != 0) {
9c445f4695c1 Eric Snow's implementation of PEP 421.
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220 Py_DECREF(ns);
9c445f4695c1 Eric Snow's implementation of PEP 421.
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221 return NULL;
9c445f4695c1 Eric Snow's implementation of PEP 421.
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222 }
9c445f4695c1 Eric Snow's implementation of PEP 421.
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223
9c445f4695c1 Eric Snow's implementation of PEP 421.
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224 return (PyObject *)ns;
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225 }