Mercurial > cpython-lru_cache-weakref

annotate Python/symtable.c @ 24155:9456a2ccda61 legacy-trunk

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The Py_REF_DEBUG/COUNT_ALLOCS/Py_TRACE_REFS macro minefield: added more trivial lexical helper macros so that uses of these guys expand to nothing at all when they're not enabled. This should help sub- standard compilers that can't do a good job of optimizing away the previous "(void)0" expressions. Py_DECREF: There's only one definition of this now. Yay! That was that last one in the family defined multiple times in an #ifdef maze. Py_FatalError(): Changed the char* signature to const char*. _Py_NegativeRefcount(): New helper function for the Py_REF_DEBUG expansion of Py_DECREF. Calling an external function cuts down on the volume of generated code. The previous inline expansion of abort() didn't work as intended on Windows (the program often kept going, and the error msg scrolled off the screen unseen). _Py_NegativeRefcount calls Py_FatalError instead, which captures our best knowledge of how to abort effectively across platforms.
author Tim Peters <tim.peters@gmail.com>
date Tue, 09 Jul 2002 02:57:01 +0000
parents 8a26bb369f53
children 3aaf24b949df
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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
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8 for a code block. Each block is loaded twice, once during the
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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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14 module's parse tree can be assigned a unique id based on the order
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15 in which the nodes are visited by the compiler. This strategy
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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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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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63 ste->ste_opt_lineno = 0;
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64 ste->ste_lineno = lineno;
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65 switch (type) {
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66 case funcdef:
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67 case lambdef:
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68 ste->ste_type = TYPE_FUNCTION;
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69 break;
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70 case classdef:
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71 ste->ste_type = TYPE_CLASS;
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72 break;
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73 case single_input:
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74 case eval_input:
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75 case file_input:
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76 ste->ste_type = TYPE_MODULE;
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77 break;
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78 }
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79
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80 if (st->st_cur == NULL)
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81 ste->ste_nested = 0;
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82 else if (st->st_cur->ste_nested
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83 || st->st_cur->ste_type == TYPE_FUNCTION)
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84 ste->ste_nested = 1;
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85 else
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86 ste->ste_nested = 0;
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87 ste->ste_child_free = 0;
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88 ste->ste_generator = 0;
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89
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90 if (PyDict_SetItem(st->st_symbols, ste->ste_id, (PyObject *)ste) < 0)
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91 goto fail;
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92
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93 return (PyObject *)ste;
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94 fail:
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95 Py_XDECREF(ste);
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96 return NULL;
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97 }
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98
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99 static PyObject *
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100 ste_repr(PySymtableEntryObject *ste)
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101 {
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102 char buf[256];
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103
21090
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104 PyOS_snprintf(buf, sizeof(buf),
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105 "<symtable entry %.100s(%ld), line %d>",
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106 PyString_AS_STRING(ste->ste_name),
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107 PyInt_AS_LONG(ste->ste_id),
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108 ste->ste_lineno);
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109 return PyString_FromString(buf);
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110 }
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111
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112 static void
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113 ste_dealloc(PySymtableEntryObject *ste)
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114 {
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115 ste->ste_table = NULL;
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116 Py_XDECREF(ste->ste_id);
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117 Py_XDECREF(ste->ste_name);
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118 Py_XDECREF(ste->ste_symbols);
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119 Py_XDECREF(ste->ste_varnames);
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120 Py_XDECREF(ste->ste_children);
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121 PyObject_Del(ste);
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122 }
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123
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124 #define OFF(x) offsetof(PySymtableEntryObject, x)
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125
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126 static PyMemberDef ste_memberlist[] = {
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127 {"id", T_OBJECT, OFF(ste_id), READONLY},
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128 {"name", T_OBJECT, OFF(ste_name), READONLY},
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129 {"symbols", T_OBJECT, OFF(ste_symbols), READONLY},
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130 {"varnames", T_OBJECT, OFF(ste_varnames), READONLY},
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131 {"children", T_OBJECT, OFF(ste_children), READONLY},
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132 {"type", T_INT, OFF(ste_type), READONLY},
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133 {"lineno", T_INT, OFF(ste_lineno), READONLY},
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134 {"optimized",T_INT, OFF(ste_optimized), READONLY},
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135 {"nested", T_INT, OFF(ste_nested), READONLY},
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136 {NULL}
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137 };
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138
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139 PyTypeObject PySymtableEntry_Type = {
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140 PyObject_HEAD_INIT(&PyType_Type)
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141 0,
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142 "symtable entry",
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143 sizeof(PySymtableEntryObject),
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144 0,
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145 (destructor)ste_dealloc, /* tp_dealloc */
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146 0, /* tp_print */
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147 0, /* tp_getattr */
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148 0, /* tp_setattr */
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149 0, /* tp_compare */
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150 (reprfunc)ste_repr, /* tp_repr */
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151 0, /* tp_as_number */
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152 0, /* tp_as_sequence */
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153 0, /* tp_as_mapping */
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154 0, /* tp_hash */
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155 0, /* tp_call */
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156 0, /* tp_str */
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157 PyObject_GenericGetAttr, /* tp_getattro */
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158 0, /* tp_setattro */
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159 0, /* tp_as_buffer */
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160 Py_TPFLAGS_DEFAULT, /* tp_flags */
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161 0, /* tp_doc */
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162 0, /* tp_traverse */
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163 0, /* tp_clear */
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164 0, /* tp_richcompare */
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165 0, /* tp_weaklistoffset */
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166 0, /* tp_iter */
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167 0, /* tp_iternext */
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168 0, /* tp_methods */
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169 ste_memberlist, /* tp_members */
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170 0, /* tp_getset */
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171 0, /* tp_base */
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172 0, /* tp_dict */
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173 0, /* tp_descr_get */
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174 0, /* tp_descr_set */
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175 0, /* tp_dictoffset */
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176 0, /* tp_init */
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177 0, /* tp_alloc */
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178 0, /* tp_new */
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179 };