annotate Objects/boolobject.c @ 57303:4aa4c19dfaed legacy-trunk

#1757126: fix typo with the cyrillic_asian alias
author Philip Jenvey <pjenvey@underboss.org>
date Tue, 17 Nov 2009 02:42:26 +0000
parents 52294af4b663
children fd25030223b0
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /* Boolean type, a subtype of int */
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2
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3 #include "Python.h"
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4
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5 /* We need to define bool_print to override int_print */
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6
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7 static int
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8 bool_print(PyBoolObject *self, FILE *fp, int flags)
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9 {
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10 Py_BEGIN_ALLOW_THREADS
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11 fputs(self->ob_ival == 0 ? "False" : "True", fp);
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12 Py_END_ALLOW_THREADS
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13 return 0;
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14 }
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15
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16 /* We define bool_repr to return "False" or "True" */
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17
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18 static PyObject *false_str = NULL;
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19 static PyObject *true_str = NULL;
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20
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21 static PyObject *
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22 bool_repr(PyBoolObject *self)
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23 {
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24 PyObject *s;
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25
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26 if (self->ob_ival)
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27 s = true_str ? true_str :
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28 (true_str = PyString_InternFromString("True"));
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29 else
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30 s = false_str ? false_str :
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31 (false_str = PyString_InternFromString("False"));
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32 Py_XINCREF(s);
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33 return s;
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34 }
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35
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36 /* Function to return a bool from a C long */
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37
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38 PyObject *PyBool_FromLong(long ok)
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39 {
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40 PyObject *result;
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41
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42 if (ok)
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43 result = Py_True;
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44 else
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45 result = Py_False;
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46 Py_INCREF(result);
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47 return result;
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48 }
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49
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50 /* We define bool_new to always return either Py_True or Py_False */
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51
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52 static PyObject *
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53 bool_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
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54 {
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55 static char *kwlist[] = {"x", 0};
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56 PyObject *x = Py_False;
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57 long ok;
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58
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59 if (!PyArg_ParseTupleAndKeywords(args, kwds, "|O:bool", kwlist, &x))
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60 return NULL;
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61 ok = PyObject_IsTrue(x);
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62 if (ok < 0)
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63 return NULL;
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64 return PyBool_FromLong(ok);
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65 }
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66
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67 /* Arithmetic operations redefined to return bool if both args are bool. */
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68
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69 static PyObject *
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70 bool_and(PyObject *a, PyObject *b)
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71 {
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72 if (!PyBool_Check(a) || !PyBool_Check(b))
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73 return PyInt_Type.tp_as_number->nb_and(a, b);
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74 return PyBool_FromLong(
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75 ((PyBoolObject *)a)->ob_ival & ((PyBoolObject *)b)->ob_ival);
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76 }
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77
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78 static PyObject *
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79 bool_or(PyObject *a, PyObject *b)
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80 {
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81 if (!PyBool_Check(a) || !PyBool_Check(b))
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82 return PyInt_Type.tp_as_number->nb_or(a, b);
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83 return PyBool_FromLong(
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84 ((PyBoolObject *)a)->ob_ival | ((PyBoolObject *)b)->ob_ival);
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85 }
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86
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87 static PyObject *
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88 bool_xor(PyObject *a, PyObject *b)
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89 {
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90 if (!PyBool_Check(a) || !PyBool_Check(b))
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91 return PyInt_Type.tp_as_number->nb_xor(a, b);
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92 return PyBool_FromLong(
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93 ((PyBoolObject *)a)->ob_ival ^ ((PyBoolObject *)b)->ob_ival);
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94 }
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95
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96 /* Doc string */
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97
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98 PyDoc_STRVAR(bool_doc,
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99 "bool(x) -> bool\n\
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100 \n\
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101 Returns True when the argument x is true, False otherwise.\n\
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102 The builtins True and False are the only two instances of the class bool.\n\
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103 The class bool is a subclass of the class int, and cannot be subclassed.");
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104
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105 /* Arithmetic methods -- only so we can override &, |, ^. */
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106
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107 static PyNumberMethods bool_as_number = {
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108 0, /* nb_add */
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109 0, /* nb_subtract */
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110 0, /* nb_multiply */
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111 0, /* nb_divide */
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112 0, /* nb_remainder */
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113 0, /* nb_divmod */
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114 0, /* nb_power */
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115 0, /* nb_negative */
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116 0, /* nb_positive */
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117 0, /* nb_absolute */
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118 0, /* nb_nonzero */
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119 0, /* nb_invert */
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120 0, /* nb_lshift */
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121 0, /* nb_rshift */
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122 bool_and, /* nb_and */
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123 bool_xor, /* nb_xor */
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124 bool_or, /* nb_or */
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125 0, /* nb_coerce */
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126 0, /* nb_int */
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127 0, /* nb_long */
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128 0, /* nb_float */
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129 0, /* nb_oct */
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130 0, /* nb_hex */
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131 0, /* nb_inplace_add */
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132 0, /* nb_inplace_subtract */
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133 0, /* nb_inplace_multiply */
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134 0, /* nb_inplace_divide */
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135 0, /* nb_inplace_remainder */
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136 0, /* nb_inplace_power */
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137 0, /* nb_inplace_lshift */
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138 0, /* nb_inplace_rshift */
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139 0, /* nb_inplace_and */
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140 0, /* nb_inplace_xor */
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141 0, /* nb_inplace_or */
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142 0, /* nb_floor_divide */
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143 0, /* nb_true_divide */
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144 0, /* nb_inplace_floor_divide */
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145 0, /* nb_inplace_true_divide */
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146 };
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147
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148 /* The type object for bool. Note that this cannot be subclassed! */
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149
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150 PyTypeObject PyBool_Type = {
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151 PyVarObject_HEAD_INIT(&PyType_Type, 0)
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152 "bool",
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153 sizeof(PyIntObject),
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154 0,
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155 0, /* tp_dealloc */
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156 (printfunc)bool_print, /* tp_print */
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157 0, /* tp_getattr */
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158 0, /* tp_setattr */
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159 0, /* tp_compare */
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160 (reprfunc)bool_repr, /* tp_repr */
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161 &bool_as_number, /* tp_as_number */
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162 0, /* tp_as_sequence */
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163 0, /* tp_as_mapping */
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164 0, /* tp_hash */
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165 0, /* tp_call */
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166 (reprfunc)bool_repr, /* tp_str */
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167 0, /* tp_getattro */
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168 0, /* tp_setattro */
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169 0, /* tp_as_buffer */
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170 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_CHECKTYPES, /* tp_flags */
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171 bool_doc, /* tp_doc */
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172 0, /* tp_traverse */
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173 0, /* tp_clear */
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174 0, /* tp_richcompare */
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175 0, /* tp_weaklistoffset */
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176 0, /* tp_iter */
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177 0, /* tp_iternext */
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178 0, /* tp_methods */
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179 0, /* tp_members */
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180 0, /* tp_getset */
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181 &PyInt_Type, /* tp_base */
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182 0, /* tp_dict */
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183 0, /* tp_descr_get */
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184 0, /* tp_descr_set */
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185 0, /* tp_dictoffset */
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186 0, /* tp_init */
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187 0, /* tp_alloc */
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188 bool_new, /* tp_new */
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189 };
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190
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191 /* The objects representing bool values False and True */
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192
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193 /* Named Zero for link-level compatibility */
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194 PyIntObject _Py_ZeroStruct = {
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195 PyObject_HEAD_INIT(&PyBool_Type)
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196 0
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197 };
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198
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199 PyIntObject _Py_TrueStruct = {
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200 PyObject_HEAD_INIT(&PyBool_Type)
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201 1
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202 };