Mercurial > cpython-lru_cache-weakref

annotate Python/symtable.c @ 31058:bf7df48012cb 2.3

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Py_Finalize(): disabled the second call of cyclic gc, and added extensive comments about why both calls to cyclic gc here can cause problems. Already fixed on the trunk. Since the calls were introduced in 2.3, that's the end of it.
author Tim Peters <tim.peters@gmail.com>
date Mon, 01 Dec 2003 22:13:12 +0000
parents 3aaf24b949df
children 302d399cfd37
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 #include "Python.h"
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08d937107fe6 Improved __future__ parser; still more to do
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2 #include "compile.h"
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3 #include "symtable.h"
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4 #include "graminit.h"
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5 #include "structmember.h"
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6
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8a26bb369f53 Add a comment explaining the st_symbols cache.
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7 /* The compiler uses this function to load a PySymtableEntry object
8a26bb369f53 Add a comment explaining the st_symbols cache.
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8 for a code block. Each block is loaded twice, once during the
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parents: 21314
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9 symbol table pass and once during the code gen pass. Entries
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10 created during the first pass are cached for the second pass, using
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11 the st_symbols dictionary.
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12
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13 The cache is keyed by st_nscopes. Each code block node in a
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parents: 21314
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14 module's parse tree can be assigned a unique id based on the order
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parents: 21314
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15 in which the nodes are visited by the compiler. This strategy
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parents: 21314
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16 works so long as the symbol table and codegen passes visit the same
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17 nodes in the same order.
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18 */
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19
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20
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21 PyObject *
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22 PySymtableEntry_New(struct symtable *st, char *name, int type, int lineno)
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23 {
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24 PySymtableEntryObject *ste = NULL;
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25 PyObject *k, *v;
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26
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27 k = PyInt_FromLong(st->st_nscopes++);
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28 if (k == NULL)
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29 goto fail;
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30 v = PyDict_GetItem(st->st_symbols, k);
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31 if (v) {
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4d5098cfa781 PySymtableEntry_New(): I'm not sure what this routine is doing, but it
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32 Py_DECREF(k);
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33 Py_INCREF(v);
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34 return v;
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35 }
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36
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37 ste = (PySymtableEntryObject *)PyObject_New(PySymtableEntryObject,
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38 &PySymtableEntry_Type);
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39 ste->ste_table = st;
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40 ste->ste_id = k;
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41
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42 v = PyString_FromString(name);
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43 if (v == NULL)
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44 goto fail;
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45 ste->ste_name = v;
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46
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47 v = PyDict_New();
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48 if (v == NULL)
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49 goto fail;
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50 ste->ste_symbols = v;
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51
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52 v = PyList_New(0);
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53 if (v == NULL)
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54 goto fail;
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55 ste->ste_varnames = v;
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56
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57 v = PyList_New(0);
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58 if (v == NULL)
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59 goto fail;
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60 ste->ste_children = v;
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61
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62 ste->ste_optimized = 0;
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485422900ef0 SF bug #488687 reported by Neal Norwitz
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63 ste->ste_opt_lineno = 0;
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64 ste->ste_tmpname = 0;
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65 ste->ste_lineno = lineno;
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66 switch (type) {
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67 case funcdef:
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68 case lambdef:
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69 ste->ste_type = TYPE_FUNCTION;
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70 break;
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71 case classdef:
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72 ste->ste_type = TYPE_CLASS;
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73 break;
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74 case single_input:
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75 case eval_input:
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76 case file_input:
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77 ste->ste_type = TYPE_MODULE;
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78 break;
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79 }
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80
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81 if (st->st_cur == NULL)
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82 ste->ste_nested = 0;
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83 else if (st->st_cur->ste_nested
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84 || st->st_cur->ste_type == TYPE_FUNCTION)
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85 ste->ste_nested = 1;
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86 else
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87 ste->ste_nested = 0;
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88 ste->ste_child_free = 0;
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7bc473b2c654 Merging the gen-branch into the main line, at Guido's direction. Yay!
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89 ste->ste_generator = 0;
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90
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91 if (PyDict_SetItem(st->st_symbols, ste->ste_id, (PyObject *)ste) < 0)
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92 goto fail;
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93
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94 return (PyObject *)ste;
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95 fail:
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96 Py_XDECREF(ste);
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97 return NULL;
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98 }
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99
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100 static PyObject *
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101 ste_repr(PySymtableEntryObject *ste)
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102 {
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103 char buf[256];
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104
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105 PyOS_snprintf(buf, sizeof(buf),
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106 "<symtable entry %.100s(%ld), line %d>",
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107 PyString_AS_STRING(ste->ste_name),
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108 PyInt_AS_LONG(ste->ste_id),
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109 ste->ste_lineno);
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110 return PyString_FromString(buf);
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111 }
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112
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113 static void
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114 ste_dealloc(PySymtableEntryObject *ste)
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115 {
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116 ste->ste_table = NULL;
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117 Py_XDECREF(ste->ste_id);
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118 Py_XDECREF(ste->ste_name);
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119 Py_XDECREF(ste->ste_symbols);
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120 Py_XDECREF(ste->ste_varnames);
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121 Py_XDECREF(ste->ste_children);
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122 PyObject_Del(ste);
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123 }
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124
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125 #define OFF(x) offsetof(PySymtableEntryObject, x)
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126
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127 static PyMemberDef ste_memberlist[] = {
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128 {"id", T_OBJECT, OFF(ste_id), READONLY},
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129 {"name", T_OBJECT, OFF(ste_name), READONLY},
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130 {"symbols", T_OBJECT, OFF(ste_symbols), READONLY},
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131 {"varnames", T_OBJECT, OFF(ste_varnames), READONLY},
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132 {"children", T_OBJECT, OFF(ste_children), READONLY},
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133 {"type", T_INT, OFF(ste_type), READONLY},
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134 {"lineno", T_INT, OFF(ste_lineno), READONLY},
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135 {"optimized",T_INT, OFF(ste_optimized), READONLY},
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136 {"nested", T_INT, OFF(ste_nested), READONLY},
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137 {NULL}
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138 };
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139
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140 PyTypeObject PySymtableEntry_Type = {
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141 PyObject_HEAD_INIT(&PyType_Type)
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142 0,
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143 "symtable entry",
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144 sizeof(PySymtableEntryObject),
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145 0,
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146 (destructor)ste_dealloc, /* tp_dealloc */
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147 0, /* tp_print */
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148 0, /* tp_getattr */
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149 0, /* tp_setattr */
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150 0, /* tp_compare */
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151 (reprfunc)ste_repr, /* tp_repr */
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152 0, /* tp_as_number */
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153 0, /* tp_as_sequence */
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154 0, /* tp_as_mapping */
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155 0, /* tp_hash */
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156 0, /* tp_call */
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157 0, /* tp_str */
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158 PyObject_GenericGetAttr, /* tp_getattro */
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159 0, /* tp_setattro */
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160 0, /* tp_as_buffer */
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161 Py_TPFLAGS_DEFAULT, /* tp_flags */
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162 0, /* tp_doc */
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163 0, /* tp_traverse */
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164 0, /* tp_clear */
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165 0, /* tp_richcompare */
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166 0, /* tp_weaklistoffset */
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167 0, /* tp_iter */
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168 0, /* tp_iternext */
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169 0, /* tp_methods */
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170 ste_memberlist, /* tp_members */
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171 0, /* tp_getset */
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172 0, /* tp_base */
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173 0, /* tp_dict */
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174 0, /* tp_descr_get */
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175 0, /* tp_descr_set */
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176 0, /* tp_dictoffset */
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177 0, /* tp_init */
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178 0, /* tp_alloc */
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179 0, /* tp_new */
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180 };