Mercurial > cpython-lru_cache-weakref

annotate Modules/_functoolsmodule.c @ 81343:3a7cd8efc19f

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#16852: merge with 3.3.
author Ezio Melotti <ezio.melotti@gmail.com>
date Thu, 10 Jan 2013 03:29:45 +0200
parents f029312764b4
children e0ee10f27e5f
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1
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2 #include "Python.h"
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3 #include "structmember.h"
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4
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5 /* _functools module written and maintained
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6 by Hye-Shik Chang <perky@FreeBSD.org>
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7 with adaptations by Raymond Hettinger <python@rcn.com>
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8 Copyright (c) 2004, 2005, 2006 Python Software Foundation.
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9 All rights reserved.
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10 */
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11
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12 /* partial object **********************************************************/
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13
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14 typedef struct {
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15 PyObject_HEAD
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16 PyObject *fn;
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17 PyObject *args;
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18 PyObject *kw;
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19 PyObject *dict;
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20 PyObject *weakreflist; /* List of weak references */
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21 } partialobject;
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22
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23 static PyTypeObject partial_type;
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24
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25 static PyObject *
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26 partial_new(PyTypeObject *type, PyObject *args, PyObject *kw)
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27 {
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28 PyObject *func;
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29 partialobject *pto;
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30
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31 if (PyTuple_GET_SIZE(args) < 1) {
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32 PyErr_SetString(PyExc_TypeError,
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33 "type 'partial' takes at least one argument");
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34 return NULL;
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35 }
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36
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37 func = PyTuple_GET_ITEM(args, 0);
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38 if (!PyCallable_Check(func)) {
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39 PyErr_SetString(PyExc_TypeError,
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40 "the first argument must be callable");
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41 return NULL;
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42 }
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43
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44 /* create partialobject structure */
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45 pto = (partialobject *)type->tp_alloc(type, 0);
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46 if (pto == NULL)
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47 return NULL;
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48
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49 pto->fn = func;
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50 Py_INCREF(func);
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51 pto->args = PyTuple_GetSlice(args, 1, PY_SSIZE_T_MAX);
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52 if (pto->args == NULL) {
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53 pto->kw = NULL;
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54 Py_DECREF(pto);
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55 return NULL;
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56 }
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57 if (kw != NULL) {
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58 pto->kw = PyDict_Copy(kw);
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59 if (pto->kw == NULL) {
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60 Py_DECREF(pto);
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61 return NULL;
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62 }
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63 } else {
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64 pto->kw = Py_None;
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65 Py_INCREF(Py_None);
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66 }
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67
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68 pto->weakreflist = NULL;
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69 pto->dict = NULL;
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70
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71 return (PyObject *)pto;
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72 }
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73
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74 static void
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75 partial_dealloc(partialobject *pto)
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76 {
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77 PyObject_GC_UnTrack(pto);
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78 if (pto->weakreflist != NULL)
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79 PyObject_ClearWeakRefs((PyObject *) pto);
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80 Py_XDECREF(pto->fn);
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81 Py_XDECREF(pto->args);
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82 Py_XDECREF(pto->kw);
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83 Py_XDECREF(pto->dict);
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84 Py_TYPE(pto)->tp_free(pto);
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85 }
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86
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87 static PyObject *
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88 partial_call(partialobject *pto, PyObject *args, PyObject *kw)
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89 {
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90 PyObject *ret;
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91 PyObject *argappl = NULL, *kwappl = NULL;
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92
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93 assert (PyCallable_Check(pto->fn));
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94 assert (PyTuple_Check(pto->args));
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95 assert (pto->kw == Py_None || PyDict_Check(pto->kw));
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96
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97 if (PyTuple_GET_SIZE(pto->args) == 0) {
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98 argappl = args;
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99 Py_INCREF(args);
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100 } else if (PyTuple_GET_SIZE(args) == 0) {
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101 argappl = pto->args;
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102 Py_INCREF(pto->args);
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103 } else {
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104 argappl = PySequence_Concat(pto->args, args);
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105 if (argappl == NULL)
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106 return NULL;
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107 }
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108
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109 if (pto->kw == Py_None) {
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110 kwappl = kw;
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111 Py_XINCREF(kw);
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112 } else {
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113 kwappl = PyDict_Copy(pto->kw);
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114 if (kwappl == NULL) {
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115 Py_DECREF(argappl);
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116 return NULL;
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117 }
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118 if (kw != NULL) {
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119 if (PyDict_Merge(kwappl, kw, 1) != 0) {
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120 Py_DECREF(argappl);
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121 Py_DECREF(kwappl);
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122 return NULL;
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123 }
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124 }
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125 }
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126
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127 ret = PyObject_Call(pto->fn, argappl, kwappl);
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128 Py_DECREF(argappl);
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129 Py_XDECREF(kwappl);
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130 return ret;
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131 }
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132
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133 static int
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134 partial_traverse(partialobject *pto, visitproc visit, void *arg)
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135 {
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136 Py_VISIT(pto->fn);
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137 Py_VISIT(pto->args);
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138 Py_VISIT(pto->kw);
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139 Py_VISIT(pto->dict);
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140 return 0;
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141 }
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142
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143 PyDoc_STRVAR(partial_doc,
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144 "partial(func, *args, **keywords) - new function with partial application\n\
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145 of the given arguments and keywords.\n");
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146
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147 #define OFF(x) offsetof(partialobject, x)
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148 static PyMemberDef partial_memberlist[] = {
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149 {"func", T_OBJECT, OFF(fn), READONLY,
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150 "function object to use in future partial calls"},
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151 {"args", T_OBJECT, OFF(args), READONLY,
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152 "tuple of arguments to future partial calls"},
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153 {"keywords", T_OBJECT, OFF(kw), READONLY,
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154 "dictionary of keyword arguments to future partial calls"},
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155 {NULL} /* Sentinel */
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156 };
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157
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158 static PyGetSetDef partial_getsetlist[] = {
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159 {"__dict__", PyObject_GenericGetDict, PyObject_GenericSetDict},
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160 {NULL} /* Sentinel */
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161 };
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162
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163 static PyObject *
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164 partial_repr(partialobject *pto)
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165 {
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166 PyObject *result;
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167 PyObject *arglist;
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168 PyObject *tmp;
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169 Py_ssize_t i, n;
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170
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171 arglist = PyUnicode_FromString("");
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172 if (arglist == NULL) {
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173 return NULL;
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174 }
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175 /* Pack positional arguments */
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176 assert (PyTuple_Check(pto->args));
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177 n = PyTuple_GET_SIZE(pto->args);
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178 for (i = 0; i < n; i++) {
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179 tmp = PyUnicode_FromFormat("%U, %R", arglist,
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180 PyTuple_GET_ITEM(pto->args, i));
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181 Py_DECREF(arglist);
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182 if (tmp == NULL)
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183 return NULL;
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184 arglist = tmp;
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185 }
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186 /* Pack keyword arguments */
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187 assert (pto->kw == Py_None || PyDict_Check(pto->kw));
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188 if (pto->kw != Py_None) {
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189 PyObject *key, *value;
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190 for (i = 0; PyDict_Next(pto->kw, &i, &key, &value);) {
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191 tmp = PyUnicode_FromFormat("%U, %U=%R", arglist,
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192 key, value);
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193 Py_DECREF(arglist);
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194 if (tmp == NULL)
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195 return NULL;
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196 arglist = tmp;
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197 }
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198 }
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199 result = PyUnicode_FromFormat("%s(%R%U)", Py_TYPE(pto)->tp_name,
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200 pto->fn, arglist);
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201 Py_DECREF(arglist);
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202 return result;
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203 }
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204
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205 /* Pickle strategy:
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206 __reduce__ by itself doesn't support getting kwargs in the unpickle
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207 operation so we define a __setstate__ that replaces all the information
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208 about the partial. If we only replaced part of it someone would use
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209 it as a hook to do strange things.
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210 */
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211
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212 static PyObject *
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213 partial_reduce(partialobject *pto, PyObject *unused)
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214 {
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215 return Py_BuildValue("O(O)(OOOO)", Py_TYPE(pto), pto->fn, pto->fn,
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216 pto->args, pto->kw,
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217 pto->dict ? pto->dict : Py_None);
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218 }
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219
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220 static PyObject *
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221 partial_setstate(partialobject *pto, PyObject *args)
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222 {
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223 PyObject *fn, *fnargs, *kw, *dict;
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224 if (!PyArg_ParseTuple(args, "(OOOO):__setstate__",
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225 &fn, &fnargs, &kw, &dict))
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226 return NULL;
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227 Py_XDECREF(pto->fn);
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228 Py_XDECREF(pto->args);
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229 Py_XDECREF(pto->kw);
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230 Py_XDECREF(pto->dict);
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231 pto->fn = fn;
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232 pto->args = fnargs;
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233 pto->kw = kw;
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234 if (dict != Py_None) {
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235 pto->dict = dict;
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236 Py_INCREF(dict);
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237 } else {
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238 pto->dict = NULL;
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239 }
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240 Py_INCREF(fn);
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241 Py_INCREF(fnargs);
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242 Py_INCREF(kw);
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243 Py_RETURN_NONE;
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244 }
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245
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246 static PyMethodDef partial_methods[] = {
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247 {"__reduce__", (PyCFunction)partial_reduce, METH_NOARGS},
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248 {"__setstate__", (PyCFunction)partial_setstate, METH_VARARGS},
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249 {NULL, NULL} /* sentinel */
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250 };
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251
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252 static PyTypeObject partial_type = {
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253 PyVarObject_HEAD_INIT(NULL, 0)
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254 "functools.partial", /* tp_name */
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255 sizeof(partialobject), /* tp_basicsize */
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256 0, /* tp_itemsize */
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257 /* methods */
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258 (destructor)partial_dealloc, /* tp_dealloc */
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259 0, /* tp_print */
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260 0, /* tp_getattr */
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261 0, /* tp_setattr */
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262 0, /* tp_reserved */
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263 (reprfunc)partial_repr, /* tp_repr */
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264 0, /* tp_as_number */
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265 0, /* tp_as_sequence */
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266 0, /* tp_as_mapping */
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267 0, /* tp_hash */
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268 (ternaryfunc)partial_call, /* tp_call */
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269 0, /* tp_str */
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270 PyObject_GenericGetAttr, /* tp_getattro */
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271 PyObject_GenericSetAttr, /* tp_setattro */
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272 0, /* tp_as_buffer */
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273 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
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274 Py_TPFLAGS_BASETYPE, /* tp_flags */
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275 partial_doc, /* tp_doc */
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276 (traverseproc)partial_traverse, /* tp_traverse */
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277 0, /* tp_clear */
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278 0, /* tp_richcompare */
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279 offsetof(partialobject, weakreflist), /* tp_weaklistoffset */
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280 0, /* tp_iter */
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281 0, /* tp_iternext */
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282 partial_methods, /* tp_methods */
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283 partial_memberlist, /* tp_members */
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284 partial_getsetlist, /* tp_getset */
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285 0, /* tp_base */
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286 0, /* tp_dict */
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287 0, /* tp_descr_get */
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288 0, /* tp_descr_set */
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289 offsetof(partialobject, dict), /* tp_dictoffset */
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290 0, /* tp_init */
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291 0, /* tp_alloc */
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292 partial_new, /* tp_new */
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293 PyObject_GC_Del, /* tp_free */
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294 };
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295
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296
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297 /* cmp_to_key ***************************************************************/
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298
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299 typedef struct {
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300 PyObject_HEAD
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301 PyObject *cmp;
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302 PyObject *object;
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303 } keyobject;
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304
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305 static void
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306 keyobject_dealloc(keyobject *ko)
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307 {
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308 Py_DECREF(ko->cmp);
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309 Py_XDECREF(ko->object);
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310 PyObject_FREE(ko);
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311 }
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312
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313 static int
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314 keyobject_traverse(keyobject *ko, visitproc visit, void *arg)
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315 {
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316 Py_VISIT(ko->cmp);
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317 if (ko->object)
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318 Py_VISIT(ko->object);
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319 return 0;
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320 }
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321
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322 static int
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323 keyobject_clear(keyobject *ko)
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324 {
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325 Py_CLEAR(ko->cmp);
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326 if (ko->object)
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327 Py_CLEAR(ko->object);
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328 return 0;
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329 }
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330
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331 static PyMemberDef keyobject_members[] = {
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332 {"obj", T_OBJECT,
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333 offsetof(keyobject, object), 0,
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334 PyDoc_STR("Value wrapped by a key function.")},
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335 {NULL}
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336 };
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337
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338 static PyObject *
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339 keyobject_call(keyobject *ko, PyObject *args, PyObject *kwds);
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340
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341 static PyObject *
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342 keyobject_richcompare(PyObject *ko, PyObject *other, int op);
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343
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344 static PyTypeObject keyobject_type = {
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345 PyVarObject_HEAD_INIT(&PyType_Type, 0)
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346 "functools.KeyWrapper", /* tp_name */
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347 sizeof(keyobject), /* tp_basicsize */
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348 0, /* tp_itemsize */
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349 /* methods */
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350 (destructor)keyobject_dealloc, /* tp_dealloc */
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351 0, /* tp_print */
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352 0, /* tp_getattr */
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353 0, /* tp_setattr */
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354 0, /* tp_reserved */
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355 0, /* tp_repr */
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356 0, /* tp_as_number */
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357 0, /* tp_as_sequence */
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358 0, /* tp_as_mapping */
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359 0, /* tp_hash */
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360 (ternaryfunc)keyobject_call, /* tp_call */
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361 0, /* tp_str */
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362 PyObject_GenericGetAttr, /* tp_getattro */
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363 0, /* tp_setattro */
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364 0, /* tp_as_buffer */
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365 Py_TPFLAGS_DEFAULT, /* tp_flags */
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366 0, /* tp_doc */
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367 (traverseproc)keyobject_traverse, /* tp_traverse */
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368 (inquiry)keyobject_clear, /* tp_clear */
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369 keyobject_richcompare, /* tp_richcompare */
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370 0, /* tp_weaklistoffset */
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371 0, /* tp_iter */
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372 0, /* tp_iternext */
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373 0, /* tp_methods */
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374 keyobject_members, /* tp_members */
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375 0, /* tp_getset */
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376 };
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377
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378 static PyObject *
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379 keyobject_call(keyobject *ko, PyObject *args, PyObject *kwds)
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380 {
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381 PyObject *object;
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382 keyobject *result;
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383 static char *kwargs[] = {"obj", NULL};
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384
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parents: 68586
diff changeset
385 if (!PyArg_ParseTupleAndKeywords(args, kwds, "O:K", kwargs, &object))
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
386 return NULL;
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
387 result = PyObject_New(keyobject, &keyobject_type);
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
388 if (!result)
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
389 return NULL;
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
390 Py_INCREF(ko->cmp);
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
391 result->cmp = ko->cmp;
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
392 Py_INCREF(object);
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
393 result->object = object;
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
394 return (PyObject *)result;
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
395 }
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
396
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
397 static PyObject *
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
398 keyobject_richcompare(PyObject *ko, PyObject *other, int op)
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
399 {
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
400 PyObject *res;
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
401 PyObject *args;
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
402 PyObject *x;
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
403 PyObject *y;
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
404 PyObject *compare;
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
405 PyObject *answer;
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
406 static PyObject *zero;
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
407
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
408 if (zero == NULL) {
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
409 zero = PyLong_FromLong(0);
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
410 if (!zero)
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
411 return NULL;
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
412 }
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
413
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
414 if (Py_TYPE(other) != &keyobject_type){
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
415 PyErr_Format(PyExc_TypeError, "other argument must be K instance");
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
416 return NULL;
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
417 }
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
418 compare = ((keyobject *) ko)->cmp;
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
419 assert(compare != NULL);
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
420 x = ((keyobject *) ko)->object;
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
421 y = ((keyobject *) other)->object;
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
422 if (!x || !y){
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
423 PyErr_Format(PyExc_AttributeError, "object");
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
424 return NULL;
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
425 }
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
426
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
427 /* Call the user's comparison function and translate the 3-way
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
428 * result into true or false (or error).
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
429 */
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
430 args = PyTuple_New(2);
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
431 if (args == NULL)
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
432 return NULL;
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
433 Py_INCREF(x);
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
434 Py_INCREF(y);
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
435 PyTuple_SET_ITEM(args, 0, x);
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
436 PyTuple_SET_ITEM(args, 1, y);
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
437 res = PyObject_Call(compare, args, NULL);
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
438 Py_DECREF(args);
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
439 if (res == NULL)
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
440 return NULL;
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
441 answer = PyObject_RichCompare(res, zero, op);
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
442 Py_DECREF(res);
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
443 return answer;
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
444 }
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
445
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
446 static PyObject *
69151
76ed6a061ebe Issue #11707: Fix compilation errors with Visual Studio
Victor Stinner <victor.stinner@haypocalc.com>
parents: 69150
diff changeset
447 functools_cmp_to_key(PyObject *self, PyObject *args, PyObject *kwds)
76ed6a061ebe Issue #11707: Fix compilation errors with Visual Studio
Victor Stinner <victor.stinner@haypocalc.com>
parents: 69150
diff changeset
448 {
76ed6a061ebe Issue #11707: Fix compilation errors with Visual Studio
Victor Stinner <victor.stinner@haypocalc.com>
parents: 69150
diff changeset
449 PyObject *cmp;
69150
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
450 static char *kwargs[] = {"mycmp", NULL};
69151
76ed6a061ebe Issue #11707: Fix compilation errors with Visual Studio
Victor Stinner <victor.stinner@haypocalc.com>
parents: 69150
diff changeset
451 keyobject *object;
69150
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
452
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
453 if (!PyArg_ParseTupleAndKeywords(args, kwds, "O:cmp_to_key", kwargs, &cmp))
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
454 return NULL;
69151
76ed6a061ebe Issue #11707: Fix compilation errors with Visual Studio
Victor Stinner <victor.stinner@haypocalc.com>
parents: 69150
diff changeset
455 object = PyObject_New(keyobject, &keyobject_type);
69150
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
456 if (!object)
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
457 return NULL;
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
458 Py_INCREF(cmp);
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
459 object->cmp = cmp;
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
460 object->object = NULL;
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
461 return (PyObject *)object;
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
462 }
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
463
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
464 PyDoc_STRVAR(functools_cmp_to_key_doc,
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
465 "Convert a cmp= function into a key= function.");
a03fb2fc3ed8 Issue #11707: Fast C version of functools.cmp_to_key()
Raymond Hettinger <python@rcn.com>
parents: 68586
diff changeset
466
39691
c4d8c054616c Part of SF patch #1513870 (the still relevant part) -- add reduce() to
Guido van Rossum <guido@python.org>
parents: 39222
diff changeset
467 /* reduce (used to be a builtin) ********************************************/
c4d8c054616c Part of SF patch #1513870 (the still relevant part) -- add reduce() to
Guido van Rossum <guido@python.org>
parents: 39222
diff changeset
468
c4d8c054616c Part of SF patch #1513870 (the still relevant part) -- add reduce() to
Guido van Rossum <guido@python.org>
parents: 39222
diff changeset
469 static PyObject *
c4d8c054616c Part of SF patch #1513870 (the still relevant part) -- add reduce() to
Guido van Rossum <guido@python.org>
parents: 39222
diff changeset
470 functools_reduce(PyObject *self, PyObject *args)
c4d8c054616c Part of SF patch #1513870 (the still relevant part) -- add reduce() to
Guido van Rossum <guido@python.org>
parents: 39222
diff changeset
471 {
61466
cab14be0ada1 Recorded merge of revisions 81029 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 54320
diff changeset
472 PyObject *seq, *func, *result = NULL, *it;
39691
c4d8c054616c Part of SF patch #1513870 (the still relevant part) -- add reduce() to
Guido van Rossum <guido@python.org>
parents: 39222
diff changeset
473
61466
cab14be0ada1 Recorded merge of revisions 81029 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 54320
diff changeset
474 if (!PyArg_UnpackTuple(args, "reduce", 2, 3, &func, &seq, &result))
cab14be0ada1 Recorded merge of revisions 81029 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 54320
diff changeset
475 return NULL;
cab14be0ada1 Recorded merge of revisions 81029 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 54320
diff changeset
476 if (result != NULL)
cab14be0ada1 Recorded merge of revisions 81029 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 54320
diff changeset
477 Py_INCREF(result);
39691
c4d8c054616c Part of SF patch #1513870 (the still relevant part) -- add reduce() to
Guido van Rossum <guido@python.org>
parents: 39222
diff changeset
478
61466
cab14be0ada1 Recorded merge of revisions 81029 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 54320
diff changeset
479 it = PyObject_GetIter(seq);
cab14be0ada1 Recorded merge of revisions 81029 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 54320
diff changeset
480 if (it == NULL) {
64068
715c44b60ef3 Issue #665761: functools.reduce() will no longer mask exceptions other
Alexander Belopolsky <alexander.belopolsky@gmail.com>
parents: 61466
diff changeset
481 if (PyErr_ExceptionMatches(PyExc_TypeError))
715c44b60ef3 Issue #665761: functools.reduce() will no longer mask exceptions other
Alexander Belopolsky <alexander.belopolsky@gmail.com>
parents: 61466
diff changeset
482 PyErr_SetString(PyExc_TypeError,
715c44b60ef3 Issue #665761: functools.reduce() will no longer mask exceptions other
Alexander Belopolsky <alexander.belopolsky@gmail.com>
parents: 61466
diff changeset
483 "reduce() arg 2 must support iteration");
61466
cab14be0ada1 Recorded merge of revisions 81029 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 54320
diff changeset
484 Py_XDECREF(result);
cab14be0ada1 Recorded merge of revisions 81029 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 54320
diff changeset
485 return NULL;
cab14be0ada1 Recorded merge of revisions 81029 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 54320
diff changeset
486 }
39691
c4d8c054616c Part of SF patch #1513870 (the still relevant part) -- add reduce() to
Guido van Rossum <guido@python.org>
parents: 39222
diff changeset
487
61466
cab14be0ada1 Recorded merge of revisions 81029 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 54320
diff changeset
488 if ((args = PyTuple_New(2)) == NULL)
cab14be0ada1 Recorded merge of revisions 81029 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 54320
diff changeset
489 goto Fail;
39691
c4d8c054616c Part of SF patch #1513870 (the still relevant part) -- add reduce() to
Guido van Rossum <guido@python.org>
parents: 39222
diff changeset
490
61466
cab14be0ada1 Recorded merge of revisions 81029 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 54320
diff changeset
491 for (;;) {
cab14be0ada1 Recorded merge of revisions 81029 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 54320
diff changeset
492 PyObject *op2;
39691
c4d8c054616c Part of SF patch #1513870 (the still relevant part) -- add reduce() to
Guido van Rossum <guido@python.org>
parents: 39222
diff changeset
493
61466
cab14be0ada1 Recorded merge of revisions 81029 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 54320
diff changeset
494 if (args->ob_refcnt > 1) {
cab14be0ada1 Recorded merge of revisions 81029 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 54320
diff changeset
495 Py_DECREF(args);
cab14be0ada1 Recorded merge of revisions 81029 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 54320
diff changeset
496 if ((args = PyTuple_New(2)) == NULL)
cab14be0ada1 Recorded merge of revisions 81029 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 54320
diff changeset
497 goto Fail;
cab14be0ada1 Recorded merge of revisions 81029 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 54320
diff changeset
498 }
39691
c4d8c054616c Part of SF patch #1513870 (the still relevant part) -- add reduce() to
Guido van Rossum <guido@python.org>
parents: 39222
diff changeset
499
61466
cab14be0ada1 Recorded merge of revisions 81029 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 54320
diff changeset
500 op2 = PyIter_Next(it);
cab14be0ada1 Recorded merge of revisions 81029 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 54320
diff changeset
501 if (op2 == NULL) {
cab14be0ada1 Recorded merge of revisions 81029 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 54320
diff changeset
502 if (PyErr_Occurred())
cab14be0ada1 Recorded merge of revisions 81029 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 54320
diff changeset
503 goto Fail;
cab14be0ada1 Recorded merge of revisions 81029 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 54320
diff changeset
504 break;
cab14be0ada1 Recorded merge of revisions 81029 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 54320
diff changeset
505 }
39691
c4d8c054616c Part of SF patch #1513870 (the still relevant part) -- add reduce() to
Guido van Rossum <guido@python.org>
parents: 39222
diff changeset
506
61466
cab14be0ada1 Recorded merge of revisions 81029 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 54320
diff changeset
507 if (result == NULL)
cab14be0ada1 Recorded merge of revisions 81029 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 54320
diff changeset
508 result = op2;
cab14be0ada1 Recorded merge of revisions 81029 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 54320
diff changeset
509 else {
cab14be0ada1 Recorded merge of revisions 81029 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 54320
diff changeset
510 PyTuple_SetItem(args, 0, result);
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511 PyTuple_SetItem(args, 1, op2);
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512 if ((result = PyEval_CallObject(func, args)) == NULL)
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513 goto Fail;
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514 }
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515 }
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516
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517 Py_DECREF(args);
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518
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519 if (result == NULL)
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520 PyErr_SetString(PyExc_TypeError,
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521 "reduce() of empty sequence with no initial value");
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522
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523 Py_DECREF(it);
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524 return result;
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525
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526 Fail:
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527 Py_XDECREF(args);
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528 Py_XDECREF(result);
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529 Py_DECREF(it);
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530 return NULL;
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531 }
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532
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533 PyDoc_STRVAR(functools_reduce_doc,
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534 "reduce(function, sequence[, initial]) -> value\n\
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535 \n\
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536 Apply a function of two arguments cumulatively to the items of a sequence,\n\
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537 from left to right, so as to reduce the sequence to a single value.\n\
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538 For example, reduce(lambda x, y: x+y, [1, 2, 3, 4, 5]) calculates\n\
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539 ((((1+2)+3)+4)+5). If initial is present, it is placed before the items\n\
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540 of the sequence in the calculation, and serves as a default when the\n\
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541 sequence is empty.");
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542
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543 /* module level code ********************************************************/
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544
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545 PyDoc_STRVAR(module_doc,
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546 "Tools that operate on functions.");
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547
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548 static PyMethodDef module_methods[] = {
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549 {"reduce", functools_reduce, METH_VARARGS, functools_reduce_doc},
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550 {"cmp_to_key", (PyCFunction)functools_cmp_to_key,
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551 METH_VARARGS | METH_KEYWORDS, functools_cmp_to_key_doc},
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552 {NULL, NULL} /* sentinel */
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553 };
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554
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Martin v. Löwis <martin@v.loewis.de>
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555
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556 static struct PyModuleDef _functoolsmodule = {
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557 PyModuleDef_HEAD_INIT,
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558 "_functools",
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559 module_doc,
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560 -1,
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561 module_methods,
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562 NULL,
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563 NULL,
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564 NULL,
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565 NULL
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566 };
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567
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568 PyMODINIT_FUNC
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569 PyInit__functools(void)
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570 {
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571 int i;
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572 PyObject *m;
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573 char *name;
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574 PyTypeObject *typelist[] = {
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575 &partial_type,
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576 NULL
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577 };
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578
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579 m = PyModule_Create(&_functoolsmodule);
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580 if (m == NULL)
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581 return NULL;
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582
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583 for (i=0 ; typelist[i] != NULL ; i++) {
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584 if (PyType_Ready(typelist[i]) < 0) {
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585 Py_DECREF(m);
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586 return NULL;
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587 }
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588 name = strchr(typelist[i]->tp_name, '.');
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589 assert (name != NULL);
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590 Py_INCREF(typelist[i]);
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591 PyModule_AddObject(m, name+1, (PyObject *)typelist[i]);
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592 }
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593 return m;
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594 }