Mercurial > cpython-lru_cache-weakref

annotate Modules/_functoolsmodule.c @ 71285:8bc9dbc61ba6 3.2

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Issue #12326: document the recommended idiom for checking sys.platform on Unix systems. Also, point to the various alternatives.
author Antoine Pitrou <solipsis@pitrou.net>
date Sat, 09 Jul 2011 15:54:23 +0200
parents dc245d681901
children 4bac47eb444c a03fb2fc3ed8
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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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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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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 PyObject *
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159 partial_get_dict(partialobject *pto)
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160 {
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161 if (pto->dict == NULL) {
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162 pto->dict = PyDict_New();
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163 if (pto->dict == NULL)
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164 return NULL;
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165 }
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166 Py_INCREF(pto->dict);
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167 return pto->dict;
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168 }
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169
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170 static int
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171 partial_set_dict(partialobject *pto, PyObject *value)
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172 {
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173 PyObject *tmp;
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174
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175 /* It is illegal to del p.__dict__ */
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176 if (value == NULL) {
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177 PyErr_SetString(PyExc_TypeError,
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178 "a partial object's dictionary may not be deleted");
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179 return -1;
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180 }
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181 /* Can only set __dict__ to a dictionary */
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182 if (!PyDict_Check(value)) {
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183 PyErr_SetString(PyExc_TypeError,
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184 "setting partial object's dictionary to a non-dict");
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185 return -1;
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186 }
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187 tmp = pto->dict;
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188 Py_INCREF(value);
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189 pto->dict = value;
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190 Py_XDECREF(tmp);
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191 return 0;
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192 }
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193
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194 static PyGetSetDef partial_getsetlist[] = {
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195 {"__dict__", (getter)partial_get_dict, (setter)partial_set_dict},
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196 {NULL} /* Sentinel */
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197 };
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198
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199 static PyObject *
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200 partial_repr(partialobject *pto)
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201 {
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202 PyObject *result;
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203 PyObject *arglist;
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204 PyObject *tmp;
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205 Py_ssize_t i, n;
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206
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207 arglist = PyUnicode_FromString("");
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208 if (arglist == NULL) {
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209 return NULL;
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210 }
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211 /* Pack positional arguments */
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212 assert (PyTuple_Check(pto->args));
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213 n = PyTuple_GET_SIZE(pto->args);
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214 for (i = 0; i < n; i++) {
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215 tmp = PyUnicode_FromFormat("%U, %R", arglist,
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216 PyTuple_GET_ITEM(pto->args, i));
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217 Py_DECREF(arglist);
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218 if (tmp == NULL)
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219 return NULL;
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220 arglist = tmp;
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221 }
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222 /* Pack keyword arguments */
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223 assert (pto->kw == Py_None || PyDict_Check(pto->kw));
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224 if (pto->kw != Py_None) {
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225 PyObject *key, *value;
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226 for (i = 0; PyDict_Next(pto->kw, &i, &key, &value);) {
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227 tmp = PyUnicode_FromFormat("%U, %U=%R", arglist,
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228 key, value);
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229 Py_DECREF(arglist);
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230 if (tmp == NULL)
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231 return NULL;
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232 arglist = tmp;
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233 }
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234 }
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235 result = PyUnicode_FromFormat("%s(%R%U)", Py_TYPE(pto)->tp_name,
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236 pto->fn, arglist);
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237 Py_DECREF(arglist);
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238 return result;
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239 }
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240
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241 /* Pickle strategy:
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242 __reduce__ by itself doesn't support getting kwargs in the unpickle
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243 operation so we define a __setstate__ that replaces all the information
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244 about the partial. If we only replaced part of it someone would use
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245 it as a hook to do strange things.
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246 */
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247
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248 static PyObject *
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249 partial_reduce(partialobject *pto, PyObject *unused)
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250 {
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251 return Py_BuildValue("O(O)(OOOO)", Py_TYPE(pto), pto->fn, pto->fn,
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252 pto->args, pto->kw,
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253 pto->dict ? pto->dict : Py_None);
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254 }
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255
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256 static PyObject *
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257 partial_setstate(partialobject *pto, PyObject *args)
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258 {
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259 PyObject *fn, *fnargs, *kw, *dict;
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260 if (!PyArg_ParseTuple(args, "(OOOO):__setstate__",
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261 &fn, &fnargs, &kw, &dict))
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262 return NULL;
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263 Py_XDECREF(pto->fn);
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264 Py_XDECREF(pto->args);
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265 Py_XDECREF(pto->kw);
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266 Py_XDECREF(pto->dict);
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267 pto->fn = fn;
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268 pto->args = fnargs;
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269 pto->kw = kw;
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270 if (dict != Py_None) {
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271 pto->dict = dict;
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272 Py_INCREF(dict);
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273 } else {
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274 pto->dict = NULL;
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275 }
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276 Py_INCREF(fn);
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277 Py_INCREF(fnargs);
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278 Py_INCREF(kw);
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279 Py_RETURN_NONE;
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280 }
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281
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282 static PyMethodDef partial_methods[] = {
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283 {"__reduce__", (PyCFunction)partial_reduce, METH_NOARGS},
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284 {"__setstate__", (PyCFunction)partial_setstate, METH_VARARGS},
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285 {NULL, NULL} /* sentinel */
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286 };
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287
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288 static PyTypeObject partial_type = {
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289 PyVarObject_HEAD_INIT(NULL, 0)
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290 "functools.partial", /* tp_name */
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291 sizeof(partialobject), /* tp_basicsize */
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292 0, /* tp_itemsize */
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293 /* methods */
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294 (destructor)partial_dealloc, /* tp_dealloc */
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295 0, /* tp_print */
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296 0, /* tp_getattr */
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297 0, /* tp_setattr */
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298 0, /* tp_reserved */
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299 (reprfunc)partial_repr, /* tp_repr */
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300 0, /* tp_as_number */
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301 0, /* tp_as_sequence */
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302 0, /* tp_as_mapping */
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303 0, /* tp_hash */
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304 (ternaryfunc)partial_call, /* tp_call */
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305 0, /* tp_str */
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306 PyObject_GenericGetAttr, /* tp_getattro */
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307 PyObject_GenericSetAttr, /* tp_setattro */
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308 0, /* tp_as_buffer */
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309 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
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310 Py_TPFLAGS_BASETYPE, /* tp_flags */
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311 partial_doc, /* tp_doc */
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312 (traverseproc)partial_traverse, /* tp_traverse */
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313 0, /* tp_clear */
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314 0, /* tp_richcompare */
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315 offsetof(partialobject, weakreflist), /* tp_weaklistoffset */
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316 0, /* tp_iter */
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317 0, /* tp_iternext */
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318 partial_methods, /* tp_methods */
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319 partial_memberlist, /* tp_members */
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320 partial_getsetlist, /* tp_getset */
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321 0, /* tp_base */
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322 0, /* tp_dict */
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323 0, /* tp_descr_get */
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324 0, /* tp_descr_set */
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325 offsetof(partialobject, dict), /* tp_dictoffset */
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326 0, /* tp_init */
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327 0, /* tp_alloc */
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328 partial_new, /* tp_new */
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329 PyObject_GC_Del, /* tp_free */
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330 };
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331
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332
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333 /* reduce (used to be a builtin) ********************************************/
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334
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335 static PyObject *
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336 functools_reduce(PyObject *self, PyObject *args)
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337 {
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338 PyObject *seq, *func, *result = NULL, *it;
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339
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340 if (!PyArg_UnpackTuple(args, "reduce", 2, 3, &func, &seq, &result))
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341 return NULL;
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342 if (result != NULL)
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343 Py_INCREF(result);
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344
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345 it = PyObject_GetIter(seq);
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346 if (it == NULL) {
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347 if (PyErr_ExceptionMatches(PyExc_TypeError))
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348 PyErr_SetString(PyExc_TypeError,
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349 "reduce() arg 2 must support iteration");
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350 Py_XDECREF(result);
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351 return NULL;
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352 }
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353
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354 if ((args = PyTuple_New(2)) == NULL)
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355 goto Fail;
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356
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357 for (;;) {
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358 PyObject *op2;
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359
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360 if (args->ob_refcnt > 1) {
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361 Py_DECREF(args);
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362 if ((args = PyTuple_New(2)) == NULL)
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363 goto Fail;
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364 }
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365
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366 op2 = PyIter_Next(it);
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367 if (op2 == NULL) {
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368 if (PyErr_Occurred())
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369 goto Fail;
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370 break;
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371 }
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372
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373 if (result == NULL)
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374 result = op2;
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375 else {
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376 PyTuple_SetItem(args, 0, result);
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377 PyTuple_SetItem(args, 1, op2);
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378 if ((result = PyEval_CallObject(func, args)) == NULL)
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379 goto Fail;
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380 }
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381 }
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382
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383 Py_DECREF(args);
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384
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385 if (result == NULL)
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386 PyErr_SetString(PyExc_TypeError,
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387 "reduce() of empty sequence with no initial value");
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388
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389 Py_DECREF(it);
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390 return result;
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391
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392 Fail:
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393 Py_XDECREF(args);
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394 Py_XDECREF(result);
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395 Py_DECREF(it);
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396 return NULL;
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397 }
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398
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399 PyDoc_STRVAR(functools_reduce_doc,
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400 "reduce(function, sequence[, initial]) -> value\n\
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401 \n\
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402 Apply a function of two arguments cumulatively to the items of a sequence,\n\
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403 from left to right, so as to reduce the sequence to a single value.\n\
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404 For example, reduce(lambda x, y: x+y, [1, 2, 3, 4, 5]) calculates\n\
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405 ((((1+2)+3)+4)+5). If initial is present, it is placed before the items\n\
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406 of the sequence in the calculation, and serves as a default when the\n\
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407 sequence is empty.");
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408
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409 /* module level code ********************************************************/
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410
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411 PyDoc_STRVAR(module_doc,
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412 "Tools that operate on functions.");
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413
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414 static PyMethodDef module_methods[] = {
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415 {"reduce", functools_reduce, METH_VARARGS, functools_reduce_doc},
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416 {NULL, NULL} /* sentinel */
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417 };
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418
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419
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420 static struct PyModuleDef _functoolsmodule = {
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421 PyModuleDef_HEAD_INIT,
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422 "_functools",
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423 module_doc,
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424 -1,
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425 module_methods,
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426 NULL,
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427 NULL,
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428 NULL,
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429 NULL
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430 };
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431
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432 PyMODINIT_FUNC
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433 PyInit__functools(void)
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434 {
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435 int i;
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436 PyObject *m;
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437 char *name;
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438 PyTypeObject *typelist[] = {
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439 &partial_type,
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440 NULL
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441 };
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442
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443 m = PyModule_Create(&_functoolsmodule);
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444 if (m == NULL)
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445 return NULL;
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446
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447 for (i=0 ; typelist[i] != NULL ; i++) {
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448 if (PyType_Ready(typelist[i]) < 0) {
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449 Py_DECREF(m);
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450 return NULL;
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451 }
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452 name = strchr(typelist[i]->tp_name, '.');
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453 assert (name != NULL);
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454 Py_INCREF(typelist[i]);
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455 PyModule_AddObject(m, name+1, (PyObject *)typelist[i]);
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456 }
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457 return m;
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458 }