annotate Modules/operator.c @ 74006:88198b93ff2f

Issue #13560: Add PyUnicode_EncodeLocale() * Use PyUnicode_EncodeLocale() in time.strftime() if wcsftime() is not available * Document my last changes in Misc/NEWS
author Victor Stinner <victor.stinner@haypocalc.com>
date Sat, 17 Dec 2011 04:13:41 +0100
parents 8beaa9a37387
children c82451eeb595
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1
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2 #include "Python.h"
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3
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4 PyDoc_STRVAR(operator_doc,
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5 "Operator interface.\n\
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6 \n\
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7 This module exports a set of functions implemented in C corresponding\n\
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8 to the intrinsic operators of Python. For example, operator.add(x, y)\n\
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9 is equivalent to the expression x+y. The function names are those\n\
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10 used for special methods; variants without leading and trailing\n\
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11 '__' are also provided for convenience.");
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12
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13 #define spam1(OP,AOP) static PyObject *OP(PyObject *s, PyObject *a1) { \
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14 return AOP(a1); }
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15
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16 #define spam2(OP,AOP) static PyObject *OP(PyObject *s, PyObject *a) { \
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17 PyObject *a1, *a2; \
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18 if(! PyArg_UnpackTuple(a,#OP,2,2,&a1,&a2)) return NULL; \
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19 return AOP(a1,a2); }
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20
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21 #define spamoi(OP,AOP) static PyObject *OP(PyObject *s, PyObject *a) { \
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22 PyObject *a1; int a2; \
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23 if(! PyArg_ParseTuple(a,"Oi:" #OP,&a1,&a2)) return NULL; \
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24 return AOP(a1,a2); }
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25
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26 #define spam2n(OP,AOP) static PyObject *OP(PyObject *s, PyObject *a) { \
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27 PyObject *a1, *a2; \
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28 if(! PyArg_UnpackTuple(a,#OP,2,2,&a1,&a2)) return NULL; \
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29 if(-1 == AOP(a1,a2)) return NULL; \
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30 Py_INCREF(Py_None); \
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31 return Py_None; }
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32
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33 #define spam3n(OP,AOP) static PyObject *OP(PyObject *s, PyObject *a) { \
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34 PyObject *a1, *a2, *a3; \
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35 if(! PyArg_UnpackTuple(a,#OP,3,3,&a1,&a2,&a3)) return NULL; \
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36 if(-1 == AOP(a1,a2,a3)) return NULL; \
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37 Py_INCREF(Py_None); \
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38 return Py_None; }
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39
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40 #define spami(OP,AOP) static PyObject *OP(PyObject *s, PyObject *a1) { \
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41 long r; \
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42 if(-1 == (r=AOP(a1))) return NULL; \
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43 return PyBool_FromLong(r); }
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44
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45 #define spami2(OP,AOP) static PyObject *OP(PyObject *s, PyObject *a) { \
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46 PyObject *a1, *a2; long r; \
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47 if(! PyArg_UnpackTuple(a,#OP,2,2,&a1,&a2)) return NULL; \
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48 if(-1 == (r=AOP(a1,a2))) return NULL; \
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49 return PyLong_FromLong(r); }
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50
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51 #define spamn2(OP,AOP) static PyObject *OP(PyObject *s, PyObject *a) { \
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52 PyObject *a1, *a2; Py_ssize_t r; \
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53 if(! PyArg_UnpackTuple(a,#OP,2,2,&a1,&a2)) return NULL; \
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54 if(-1 == (r=AOP(a1,a2))) return NULL; \
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55 return PyLong_FromSsize_t(r); }
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56
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57 #define spami2b(OP,AOP) static PyObject *OP(PyObject *s, PyObject *a) { \
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58 PyObject *a1, *a2; long r; \
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59 if(! PyArg_UnpackTuple(a,#OP,2,2,&a1,&a2)) return NULL; \
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60 if(-1 == (r=AOP(a1,a2))) return NULL; \
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61 return PyBool_FromLong(r); }
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62
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63 #define spamrc(OP,A) static PyObject *OP(PyObject *s, PyObject *a) { \
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64 PyObject *a1, *a2; \
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65 if(! PyArg_UnpackTuple(a,#OP,2,2,&a1,&a2)) return NULL; \
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66 return PyObject_RichCompare(a1,a2,A); }
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67
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68 spami(truth , PyObject_IsTrue)
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69 spam2(op_add , PyNumber_Add)
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70 spam2(op_sub , PyNumber_Subtract)
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71 spam2(op_mul , PyNumber_Multiply)
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72 spam2(op_floordiv , PyNumber_FloorDivide)
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73 spam2(op_truediv , PyNumber_TrueDivide)
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74 spam2(op_mod , PyNumber_Remainder)
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75 spam1(op_neg , PyNumber_Negative)
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76 spam1(op_pos , PyNumber_Positive)
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77 spam1(op_abs , PyNumber_Absolute)
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78 spam1(op_inv , PyNumber_Invert)
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79 spam1(op_invert , PyNumber_Invert)
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80 spam2(op_lshift , PyNumber_Lshift)
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81 spam2(op_rshift , PyNumber_Rshift)
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82 spami(op_not_ , PyObject_Not)
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83 spam2(op_and_ , PyNumber_And)
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84 spam2(op_xor , PyNumber_Xor)
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85 spam2(op_or_ , PyNumber_Or)
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86 spam2(op_iadd , PyNumber_InPlaceAdd)
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87 spam2(op_isub , PyNumber_InPlaceSubtract)
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88 spam2(op_imul , PyNumber_InPlaceMultiply)
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89 spam2(op_ifloordiv , PyNumber_InPlaceFloorDivide)
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90 spam2(op_itruediv , PyNumber_InPlaceTrueDivide)
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91 spam2(op_imod , PyNumber_InPlaceRemainder)
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92 spam2(op_ilshift , PyNumber_InPlaceLshift)
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93 spam2(op_irshift , PyNumber_InPlaceRshift)
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94 spam2(op_iand , PyNumber_InPlaceAnd)
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95 spam2(op_ixor , PyNumber_InPlaceXor)
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96 spam2(op_ior , PyNumber_InPlaceOr)
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97 spam2(op_concat , PySequence_Concat)
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98 spam2(op_iconcat , PySequence_InPlaceConcat)
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99 spami2b(op_contains , PySequence_Contains)
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100 spamn2(indexOf , PySequence_Index)
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101 spamn2(countOf , PySequence_Count)
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102 spam2(op_getitem , PyObject_GetItem)
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103 spam2n(op_delitem , PyObject_DelItem)
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104 spam3n(op_setitem , PyObject_SetItem)
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105 spamrc(op_lt , Py_LT)
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106 spamrc(op_le , Py_LE)
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107 spamrc(op_eq , Py_EQ)
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108 spamrc(op_ne , Py_NE)
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109 spamrc(op_gt , Py_GT)
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110 spamrc(op_ge , Py_GE)
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111
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112 static PyObject*
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113 op_pow(PyObject *s, PyObject *a)
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114 {
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115 PyObject *a1, *a2;
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116 if (PyArg_UnpackTuple(a,"pow", 2, 2, &a1, &a2))
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117 return PyNumber_Power(a1, a2, Py_None);
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118 return NULL;
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119 }
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120
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121 static PyObject*
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122 op_ipow(PyObject *s, PyObject *a)
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123 {
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124 PyObject *a1, *a2;
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125 if (PyArg_UnpackTuple(a,"ipow", 2, 2, &a1, &a2))
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126 return PyNumber_InPlacePower(a1, a2, Py_None);
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127 return NULL;
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128 }
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129
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130 static PyObject *
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131 op_index(PyObject *s, PyObject *a)
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132 {
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133 return PyNumber_Index(a);
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134 }
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135
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136 static PyObject*
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137 is_(PyObject *s, PyObject *a)
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138 {
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139 PyObject *a1, *a2, *result = NULL;
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140 if (PyArg_UnpackTuple(a,"is_", 2, 2, &a1, &a2)) {
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141 result = (a1 == a2) ? Py_True : Py_False;
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142 Py_INCREF(result);
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143 }
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144 return result;
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145 }
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146
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147 static PyObject*
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148 is_not(PyObject *s, PyObject *a)
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149 {
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150 PyObject *a1, *a2, *result = NULL;
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151 if (PyArg_UnpackTuple(a,"is_not", 2, 2, &a1, &a2)) {
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152 result = (a1 != a2) ? Py_True : Py_False;
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153 Py_INCREF(result);
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154 }
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155 return result;
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156 }
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157
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158 #undef spam1
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159 #undef spam2
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160 #undef spam1o
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161 #undef spam1o
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162 #define spam1(OP,DOC) {#OP, OP, METH_VARARGS, PyDoc_STR(DOC)},
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163 #define spam2(OP,ALTOP,DOC) {#OP, op_##OP, METH_VARARGS, PyDoc_STR(DOC)}, \
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164 {#ALTOP, op_##OP, METH_VARARGS, PyDoc_STR(DOC)},
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165 #define spam1o(OP,DOC) {#OP, OP, METH_O, PyDoc_STR(DOC)},
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166 #define spam2o(OP,ALTOP,DOC) {#OP, op_##OP, METH_O, PyDoc_STR(DOC)}, \
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167 {#ALTOP, op_##OP, METH_O, PyDoc_STR(DOC)},
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168
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169 static struct PyMethodDef operator_methods[] = {
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170
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171 spam1o(truth,
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172 "truth(a) -- Return True if a is true, False otherwise.")
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173 spam2(contains,__contains__,
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174 "contains(a, b) -- Same as b in a (note reversed operands).")
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175 spam1(indexOf,
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176 "indexOf(a, b) -- Return the first index of b in a.")
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177 spam1(countOf,
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178 "countOf(a, b) -- Return the number of times b occurs in a.")
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179
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180 spam1(is_, "is_(a, b) -- Same as a is b.")
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181 spam1(is_not, "is_not(a, b) -- Same as a is not b.")
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182 spam2o(index, __index__, "index(a) -- Same as a.__index__()")
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183 spam2(add,__add__, "add(a, b) -- Same as a + b.")
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184 spam2(sub,__sub__, "sub(a, b) -- Same as a - b.")
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185 spam2(mul,__mul__, "mul(a, b) -- Same as a * b.")
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186 spam2(floordiv,__floordiv__, "floordiv(a, b) -- Same as a // b.")
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187 spam2(truediv,__truediv__, "truediv(a, b) -- Same as a / b.")
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188 spam2(mod,__mod__, "mod(a, b) -- Same as a % b.")
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189 spam2o(neg,__neg__, "neg(a) -- Same as -a.")
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190 spam2o(pos,__pos__, "pos(a) -- Same as +a.")
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191 spam2o(abs,__abs__, "abs(a) -- Same as abs(a).")
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192 spam2o(inv,__inv__, "inv(a) -- Same as ~a.")
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193 spam2o(invert,__invert__, "invert(a) -- Same as ~a.")
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194 spam2(lshift,__lshift__, "lshift(a, b) -- Same as a << b.")
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195 spam2(rshift,__rshift__, "rshift(a, b) -- Same as a >> b.")
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196 spam2o(not_,__not__, "not_(a) -- Same as not a.")
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197 spam2(and_,__and__, "and_(a, b) -- Same as a & b.")
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198 spam2(xor,__xor__, "xor(a, b) -- Same as a ^ b.")
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199 spam2(or_,__or__, "or_(a, b) -- Same as a | b.")
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200 spam2(iadd,__iadd__, "a = iadd(a, b) -- Same as a += b.")
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201 spam2(isub,__isub__, "a = isub(a, b) -- Same as a -= b.")
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202 spam2(imul,__imul__, "a = imul(a, b) -- Same as a *= b.")
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203 spam2(ifloordiv,__ifloordiv__, "a = ifloordiv(a, b) -- Same as a //= b.")
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204 spam2(itruediv,__itruediv__, "a = itruediv(a, b) -- Same as a /= b")
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205 spam2(imod,__imod__, "a = imod(a, b) -- Same as a %= b.")
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206 spam2(ilshift,__ilshift__, "a = ilshift(a, b) -- Same as a <<= b.")
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207 spam2(irshift,__irshift__, "a = irshift(a, b) -- Same as a >>= b.")
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208 spam2(iand,__iand__, "a = iand(a, b) -- Same as a &= b.")
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209 spam2(ixor,__ixor__, "a = ixor(a, b) -- Same as a ^= b.")
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210 spam2(ior,__ior__, "a = ior(a, b) -- Same as a |= b.")
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211 spam2(concat,__concat__,
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212 "concat(a, b) -- Same as a + b, for a and b sequences.")
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213 spam2(iconcat,__iconcat__,
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214 "a = iconcat(a, b) -- Same as a += b, for a and b sequences.")
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215 spam2(getitem,__getitem__,
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216 "getitem(a, b) -- Same as a[b].")
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217 spam2(setitem,__setitem__,
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218 "setitem(a, b, c) -- Same as a[b] = c.")
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219 spam2(delitem,__delitem__,
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220 "delitem(a, b) -- Same as del a[b].")
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221 spam2(pow,__pow__, "pow(a, b) -- Same as a ** b.")
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222 spam2(ipow,__ipow__, "a = ipow(a, b) -- Same as a **= b.")
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223 spam2(lt,__lt__, "lt(a, b) -- Same as a<b.")
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224 spam2(le,__le__, "le(a, b) -- Same as a<=b.")
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225 spam2(eq,__eq__, "eq(a, b) -- Same as a==b.")
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226 spam2(ne,__ne__, "ne(a, b) -- Same as a!=b.")
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227 spam2(gt,__gt__, "gt(a, b) -- Same as a>b.")
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228 spam2(ge,__ge__, "ge(a, b) -- Same as a>=b.")
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229
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230 {NULL, NULL} /* sentinel */
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231
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232 };
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233
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234 /* itemgetter object **********************************************************/
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235
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236 typedef struct {
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237 PyObject_HEAD
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238 Py_ssize_t nitems;
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239 PyObject *item;
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240 } itemgetterobject;
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241
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242 static PyTypeObject itemgetter_type;
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243
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244 static PyObject *
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245 itemgetter_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
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246 {
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247 itemgetterobject *ig;
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248 PyObject *item;
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249 Py_ssize_t nitems;
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250
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251 if (!_PyArg_NoKeywords("itemgetter()", kwds))
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252 return NULL;
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253
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254 nitems = PyTuple_GET_SIZE(args);
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255 if (nitems <= 1) {
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256 if (!PyArg_UnpackTuple(args, "itemgetter", 1, 1, &item))
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257 return NULL;
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258 } else
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259 item = args;
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260
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261 /* create itemgetterobject structure */
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262 ig = PyObject_GC_New(itemgetterobject, &itemgetter_type);
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263 if (ig == NULL)
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264 return NULL;
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265
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266 Py_INCREF(item);
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267 ig->item = item;
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268 ig->nitems = nitems;
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269
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270 PyObject_GC_Track(ig);
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271 return (PyObject *)ig;
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272 }
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273
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274 static void
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275 itemgetter_dealloc(itemgetterobject *ig)
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276 {
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277 PyObject_GC_UnTrack(ig);
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278 Py_XDECREF(ig->item);
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279 PyObject_GC_Del(ig);
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280 }
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281
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282 static int
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283 itemgetter_traverse(itemgetterobject *ig, visitproc visit, void *arg)
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284 {
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285 Py_VISIT(ig->item);
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286 return 0;
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287 }
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288
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289 static PyObject *
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290 itemgetter_call(itemgetterobject *ig, PyObject *args, PyObject *kw)
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291 {
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292 PyObject *obj, *result;
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293 Py_ssize_t i, nitems=ig->nitems;
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294
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295 if (!PyArg_UnpackTuple(args, "itemgetter", 1, 1, &obj))
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296 return NULL;
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297 if (nitems == 1)
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298 return PyObject_GetItem(obj, ig->item);
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299
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300 assert(PyTuple_Check(ig->item));
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301 assert(PyTuple_GET_SIZE(ig->item) == nitems);
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302
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303 result = PyTuple_New(nitems);
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304 if (result == NULL)
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305 return NULL;
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306
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307 for (i=0 ; i < nitems ; i++) {
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308 PyObject *item, *val;
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309 item = PyTuple_GET_ITEM(ig->item, i);
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310 val = PyObject_GetItem(obj, item);
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311 if (val == NULL) {
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312 Py_DECREF(result);
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313 return NULL;
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314 }
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315 PyTuple_SET_ITEM(result, i, val);
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316 }
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317 return result;
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318 }
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319
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320 PyDoc_STRVAR(itemgetter_doc,
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321 "itemgetter(item, ...) --> itemgetter object\n\
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322 \n\
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323 Return a callable object that fetches the given item(s) from its operand.\n\
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324 After, f=itemgetter(2), the call f(r) returns r[2].\n\
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325 After, g=itemgetter(2,5,3), the call g(r) returns (r[2], r[5], r[3])");
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326
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327 static PyTypeObject itemgetter_type = {
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328 PyVarObject_HEAD_INIT(NULL, 0)
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329 "operator.itemgetter", /* tp_name */
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330 sizeof(itemgetterobject), /* tp_basicsize */
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331 0, /* tp_itemsize */
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332 /* methods */
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333 (destructor)itemgetter_dealloc, /* tp_dealloc */
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334 0, /* tp_print */
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335 0, /* tp_getattr */
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336 0, /* tp_setattr */
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337 0, /* tp_reserved */
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338 0, /* tp_repr */
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339 0, /* tp_as_number */
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340 0, /* tp_as_sequence */
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341 0, /* tp_as_mapping */
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342 0, /* tp_hash */
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343 (ternaryfunc)itemgetter_call, /* tp_call */
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344 0, /* tp_str */
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345 PyObject_GenericGetAttr, /* tp_getattro */
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346 0, /* tp_setattro */
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347 0, /* tp_as_buffer */
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348 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */
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349 itemgetter_doc, /* tp_doc */
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350 (traverseproc)itemgetter_traverse, /* tp_traverse */
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351 0, /* tp_clear */
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352 0, /* tp_richcompare */
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353 0, /* tp_weaklistoffset */
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354 0, /* tp_iter */
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355 0, /* tp_iternext */
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356 0, /* tp_methods */
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357 0, /* tp_members */
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358 0, /* tp_getset */
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359 0, /* tp_base */
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360 0, /* tp_dict */
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361 0, /* tp_descr_get */
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362 0, /* tp_descr_set */
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363 0, /* tp_dictoffset */
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364 0, /* tp_init */
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365 0, /* tp_alloc */
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366 itemgetter_new, /* tp_new */
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367 0, /* tp_free */
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368 };
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369
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370
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371 /* attrgetter object **********************************************************/
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372
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373 typedef struct {
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374 PyObject_HEAD
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375 Py_ssize_t nattrs;
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376 PyObject *attr;
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377 } attrgetterobject;
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378
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379 static PyTypeObject attrgetter_type;
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380
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381 static PyObject *
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382 attrgetter_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
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diff changeset
383 {
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384 attrgetterobject *ag;
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385 PyObject *attr;
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386 Py_ssize_t nattrs, idx, char_idx;
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387
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388 if (!_PyArg_NoKeywords("attrgetter()", kwds))
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389 return NULL;
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390
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391 nattrs = PyTuple_GET_SIZE(args);
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392 if (nattrs <= 1) {
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393 if (!PyArg_UnpackTuple(args, "attrgetter", 1, 1, &attr))
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394 return NULL;
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395 }
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396
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397 attr = PyTuple_New(nattrs);
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398 if (attr == NULL)
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399 return NULL;
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400
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401 /* prepare attr while checking args */
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402 for (idx = 0; idx < nattrs; ++idx) {
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403 PyObject *item = PyTuple_GET_ITEM(args, idx);
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404 Py_ssize_t item_len;
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405 void *data;
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406 unsigned int kind;
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407 int dot_count;
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408
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409 if (!PyUnicode_Check(item)) {
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410 PyErr_SetString(PyExc_TypeError,
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411 "attribute name must be a string");
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412 Py_DECREF(attr);
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413 return NULL;
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414 }
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415 if (PyUnicode_READY(item)) {
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416 Py_DECREF(attr);
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417 return NULL;
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418 }
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419 item_len = PyUnicode_GET_LENGTH(item);
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420 kind = PyUnicode_KIND(item);
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421 data = PyUnicode_DATA(item);
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422
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423 /* check whethere the string is dotted */
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424 dot_count = 0;
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425 for (char_idx = 0; char_idx < item_len; ++char_idx) {
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426 if (PyUnicode_READ(kind, data, char_idx) == '.')
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427 ++dot_count;
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428 }
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429
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430 if (dot_count == 0) {
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431 Py_INCREF(item);
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432 PyUnicode_InternInPlace(&item);
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433 PyTuple_SET_ITEM(attr, idx, item);
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434 } else { /* make it a tuple of non-dotted attrnames */
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435 PyObject *attr_chain = PyTuple_New(dot_count + 1);
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436 PyObject *attr_chain_item;
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437 Py_ssize_t unibuff_from = 0;
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438 Py_ssize_t unibuff_till = 0;
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439 Py_ssize_t attr_chain_idx = 0;
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440
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441 if (attr_chain == NULL) {
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442 Py_DECREF(attr);
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443 return NULL;
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444 }
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445
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446 for (; dot_count > 0; --dot_count) {
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447 while (PyUnicode_READ(kind, data, unibuff_till) != '.') {
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448 ++unibuff_till;
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449 }
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450 attr_chain_item = PyUnicode_Substring(item,
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451 unibuff_from,
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452 unibuff_till);
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453 if (attr_chain_item == NULL) {
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454 Py_DECREF(attr_chain);
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455 Py_DECREF(attr);
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456 return NULL;
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457 }
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458 PyUnicode_InternInPlace(&attr_chain_item);
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459 PyTuple_SET_ITEM(attr_chain, attr_chain_idx, attr_chain_item);
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460 ++attr_chain_idx;
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461 unibuff_till = unibuff_from = unibuff_till + 1;
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462 }
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463
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464 /* now add the last dotless name */
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465 attr_chain_item = PyUnicode_Substring(item,
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466 unibuff_from, item_len);
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467 if (attr_chain_item == NULL) {
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468 Py_DECREF(attr_chain);
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469 Py_DECREF(attr);
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470 return NULL;
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471 }
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472 PyUnicode_InternInPlace(&attr_chain_item);
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473 PyTuple_SET_ITEM(attr_chain, attr_chain_idx, attr_chain_item);
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474
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475 PyTuple_SET_ITEM(attr, idx, attr_chain);
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476 }
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477 }
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478
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479 /* create attrgetterobject structure */
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diff changeset
480 ag = PyObject_GC_New(attrgetterobject, &attrgetter_type);
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481 if (ag == NULL) {
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482 Py_DECREF(attr);
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483 return NULL;
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484 }
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485
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486 ag->attr = attr;
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487 ag->nattrs = nattrs;
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488
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489 PyObject_GC_Track(ag);
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490 return (PyObject *)ag;
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491 }
456e274f8602 As discussed on python-dev, added two extractor functions to the
Raymond Hettinger <python@rcn.com>
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492
456e274f8602 As discussed on python-dev, added two extractor functions to the
Raymond Hettinger <python@rcn.com>
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diff changeset
493 static void
456e274f8602 As discussed on python-dev, added two extractor functions to the
Raymond Hettinger <python@rcn.com>
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diff changeset
494 attrgetter_dealloc(attrgetterobject *ag)
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parents: 27290
diff changeset
495 {
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496 PyObject_GC_UnTrack(ag);
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497 Py_XDECREF(ag->attr);
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diff changeset
498 PyObject_GC_Del(ag);
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499 }
456e274f8602 As discussed on python-dev, added two extractor functions to the
Raymond Hettinger <python@rcn.com>
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500
456e274f8602 As discussed on python-dev, added two extractor functions to the
Raymond Hettinger <python@rcn.com>
parents: 27290
diff changeset
501 static int
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502 attrgetter_traverse(attrgetterobject *ag, visitproc visit, void *arg)
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503 {
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504 Py_VISIT(ag->attr);
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505 return 0;
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506 }
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507
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508 static PyObject *
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509 dotted_getattr(PyObject *obj, PyObject *attr)
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510 {
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511 PyObject *newobj;
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512
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513 /* attr is either a tuple or instance of str.
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514 Ensured by the setup code of attrgetter_new */
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515 if (PyTuple_CheckExact(attr)) { /* chained getattr */
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516 Py_ssize_t name_idx = 0, name_count;
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517 PyObject *attr_name;
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518
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519 name_count = PyTuple_GET_SIZE(attr);
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520 Py_INCREF(obj);
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521 for (name_idx = 0; name_idx < name_count; ++name_idx) {
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522 attr_name = PyTuple_GET_ITEM(attr, name_idx);
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523 newobj = PyObject_GetAttr(obj, attr_name);
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524 Py_DECREF(obj);
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525 if (newobj == NULL) {
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526 return NULL;
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527 }
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528 /* here */
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529 obj = newobj;
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530 }
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531 } else { /* single getattr */
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532 newobj = PyObject_GetAttr(obj, attr);
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533 if (newobj == NULL)
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534 return NULL;
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535 obj = newobj;
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536 }
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537
61466
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538 return obj;
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539 }
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540
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541 static PyObject *
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542 attrgetter_call(attrgetterobject *ag, PyObject *args, PyObject *kw)
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543 {
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544 PyObject *obj, *result;
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545 Py_ssize_t i, nattrs=ag->nattrs;
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546
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547 if (!PyArg_UnpackTuple(args, "attrgetter", 1, 1, &obj))
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548 return NULL;
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549 if (ag->nattrs == 1) /* ag->attr is always a tuple */
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550 return dotted_getattr(obj, PyTuple_GET_ITEM(ag->attr, 0));
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551
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552 assert(PyTuple_Check(ag->attr));
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553 assert(PyTuple_GET_SIZE(ag->attr) == nattrs);
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554
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555 result = PyTuple_New(nattrs);
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556 if (result == NULL)
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557 return NULL;
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558
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559 for (i=0 ; i < nattrs ; i++) {
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560 PyObject *attr, *val;
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561 attr = PyTuple_GET_ITEM(ag->attr, i);
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562 val = dotted_getattr(obj, attr);
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563 if (val == NULL) {
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564 Py_DECREF(result);
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565 return NULL;
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566 }
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567 PyTuple_SET_ITEM(result, i, val);
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568 }
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569 return result;
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570 }
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571
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572 PyDoc_STRVAR(attrgetter_doc,
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573 "attrgetter(attr, ...) --> attrgetter object\n\
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574 \n\
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575 Return a callable object that fetches the given attribute(s) from its operand.\n\
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576 After, f=attrgetter('name'), the call f(r) returns r.name.\n\
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577 After, g=attrgetter('name', 'date'), the call g(r) returns (r.name, r.date).\n\
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578 After, h=attrgetter('name.first', 'name.last'), the call h(r) returns\n\
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579 (r.name.first, r.name.last).");
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580
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581 static PyTypeObject attrgetter_type = {
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582 PyVarObject_HEAD_INIT(NULL, 0)
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583 "operator.attrgetter", /* tp_name */
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584 sizeof(attrgetterobject), /* tp_basicsize */
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585 0, /* tp_itemsize */
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586 /* methods */
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587 (destructor)attrgetter_dealloc, /* tp_dealloc */
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588 0, /* tp_print */
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589 0, /* tp_getattr */
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590 0, /* tp_setattr */
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591 0, /* tp_reserved */
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592 0, /* tp_repr */
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593 0, /* tp_as_number */
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594 0, /* tp_as_sequence */
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595 0, /* tp_as_mapping */
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596 0, /* tp_hash */
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597 (ternaryfunc)attrgetter_call, /* tp_call */
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598 0, /* tp_str */
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599 PyObject_GenericGetAttr, /* tp_getattro */
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600 0, /* tp_setattro */
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601 0, /* tp_as_buffer */
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602 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */
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603 attrgetter_doc, /* tp_doc */
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604 (traverseproc)attrgetter_traverse, /* tp_traverse */
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605 0, /* tp_clear */
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606 0, /* tp_richcompare */
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607 0, /* tp_weaklistoffset */
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608 0, /* tp_iter */
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609 0, /* tp_iternext */
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610 0, /* tp_methods */
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611 0, /* tp_members */
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612 0, /* tp_getset */
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613 0, /* tp_base */
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614 0, /* tp_dict */
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615 0, /* tp_descr_get */
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616 0, /* tp_descr_set */
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617 0, /* tp_dictoffset */
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618 0, /* tp_init */
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619 0, /* tp_alloc */
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620 attrgetter_new, /* tp_new */
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621 0, /* tp_free */
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622 };
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623
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624
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625 /* methodcaller object **********************************************************/
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626
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627 typedef struct {
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628 PyObject_HEAD
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629 PyObject *name;
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630 PyObject *args;
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631 PyObject *kwds;
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632 } methodcallerobject;
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633
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634 static PyTypeObject methodcaller_type;
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635
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636 static PyObject *
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637 methodcaller_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
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638 {
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639 methodcallerobject *mc;
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640 PyObject *name, *newargs;
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641
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642 if (PyTuple_GET_SIZE(args) < 1) {
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643 PyErr_SetString(PyExc_TypeError, "methodcaller needs at least "
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644 "one argument, the method name");
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645 return NULL;
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646 }
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647
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648 /* create methodcallerobject structure */
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649 mc = PyObject_GC_New(methodcallerobject, &methodcaller_type);
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650 if (mc == NULL)
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651 return NULL;
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652
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653 newargs = PyTuple_GetSlice(args, 1, PyTuple_GET_SIZE(args));
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654 if (newargs == NULL) {
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655 Py_DECREF(mc);
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656 return NULL;
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657 }
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658 mc->args = newargs;
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659
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660 name = PyTuple_GET_ITEM(args, 0);
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661 Py_INCREF(name);
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662 mc->name = name;
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663
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664 Py_XINCREF(kwds);
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665 mc->kwds = kwds;
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666
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667 PyObject_GC_Track(mc);
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668 return (PyObject *)mc;
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669 }
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670
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671 static void
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672 methodcaller_dealloc(methodcallerobject *mc)
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673 {
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674 PyObject_GC_UnTrack(mc);
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675 Py_XDECREF(mc->name);
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676 Py_XDECREF(mc->args);
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677 Py_XDECREF(mc->kwds);
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678 PyObject_GC_Del(mc);
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679 }
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680
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681 static int
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682 methodcaller_traverse(methodcallerobject *mc, visitproc visit, void *arg)
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683 {
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684 Py_VISIT(mc->args);
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685 Py_VISIT(mc->kwds);
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686 return 0;
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687 }
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688
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689 static PyObject *
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690 methodcaller_call(methodcallerobject *mc, PyObject *args, PyObject *kw)
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691 {
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692 PyObject *method, *obj, *result;
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693
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694 if (!PyArg_UnpackTuple(args, "methodcaller", 1, 1, &obj))
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695 return NULL;
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696 method = PyObject_GetAttr(obj, mc->name);
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697 if (method == NULL)
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698 return NULL;
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699 result = PyObject_Call(method, mc->args, mc->kwds);
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700 Py_DECREF(method);
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701 return result;
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702 }
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703
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704 PyDoc_STRVAR(methodcaller_doc,
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705 "methodcaller(name, ...) --> methodcaller object\n\
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706 \n\
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707 Return a callable object that calls the given method on its operand.\n\
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708 After, f = methodcaller('name'), the call f(r) returns r.name().\n\
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709 After, g = methodcaller('name', 'date', foo=1), the call g(r) returns\n\
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710 r.name('date', foo=1).");
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711
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712 static PyTypeObject methodcaller_type = {
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713 PyVarObject_HEAD_INIT(NULL, 0)
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714 "operator.methodcaller", /* tp_name */
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715 sizeof(methodcallerobject), /* tp_basicsize */
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716 0, /* tp_itemsize */
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717 /* methods */
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718 (destructor)methodcaller_dealloc, /* tp_dealloc */
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719 0, /* tp_print */
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720 0, /* tp_getattr */
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721 0, /* tp_setattr */
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722 0, /* tp_reserved */
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723 0, /* tp_repr */
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724 0, /* tp_as_number */
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725 0, /* tp_as_sequence */
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726 0, /* tp_as_mapping */
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727 0, /* tp_hash */
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728 (ternaryfunc)methodcaller_call, /* tp_call */
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729 0, /* tp_str */
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730 PyObject_GenericGetAttr, /* tp_getattro */
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731 0, /* tp_setattro */
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732 0, /* tp_as_buffer */
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733 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,/* tp_flags */
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734 methodcaller_doc, /* tp_doc */
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735 (traverseproc)methodcaller_traverse, /* tp_traverse */
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736 0, /* tp_clear */
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737 0, /* tp_richcompare */
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738 0, /* tp_weaklistoffset */
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739 0, /* tp_iter */
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740 0, /* tp_iternext */
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741 0, /* tp_methods */
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742 0, /* tp_members */
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743 0, /* tp_getset */
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744 0, /* tp_base */
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745 0, /* tp_dict */
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746 0, /* tp_descr_get */
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747 0, /* tp_descr_set */
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748 0, /* tp_dictoffset */
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749 0, /* tp_init */
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750 0, /* tp_alloc */
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751 methodcaller_new, /* tp_new */
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752 0, /* tp_free */
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753 };
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754
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755
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756 /* Initialization function for the module (*must* be called PyInit_operator) */
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757
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758
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759 static struct PyModuleDef operatormodule = {
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760 PyModuleDef_HEAD_INIT,
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761 "operator",
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762 operator_doc,
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763 -1,
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764 operator_methods,
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765 NULL,
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766 NULL,
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767 NULL,
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768 NULL
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769 };
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770
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771 PyMODINIT_FUNC
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772 PyInit_operator(void)
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773 {
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774 PyObject *m;
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775
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776 /* Create the module and add the functions */
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777 m = PyModule_Create(&operatormodule);
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778 if (m == NULL)
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779 return NULL;
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780
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781 if (PyType_Ready(&itemgetter_type) < 0)
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782 return NULL;
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783 Py_INCREF(&itemgetter_type);
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784 PyModule_AddObject(m, "itemgetter", (PyObject *)&itemgetter_type);
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785
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786 if (PyType_Ready(&attrgetter_type) < 0)
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787 return NULL;
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788 Py_INCREF(&attrgetter_type);
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789 PyModule_AddObject(m, "attrgetter", (PyObject *)&attrgetter_type);
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790
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791 if (PyType_Ready(&methodcaller_type) < 0)
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792 return NULL;
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793 Py_INCREF(&methodcaller_type);
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794 PyModule_AddObject(m, "methodcaller", (PyObject *)&methodcaller_type);
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795 return m;
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796 }