Mercurial > cpython-lru_cache-weakref

annotate Objects/enumobject.c @ 83447:678564fc0962 3.3

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#17789: test_random now works with unittest test discovery. Patch by Zachary Ware.
author Ezio Melotti <ezio.melotti@gmail.com>
date Fri, 19 Apr 2013 05:45:27 +0300
parents 4ff234337e24
children
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1 /* enumerate object */
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2
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3 #include "Python.h"
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4
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5 typedef struct {
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6 PyObject_HEAD
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7 Py_ssize_t en_index; /* current index of enumeration */
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8 PyObject* en_sit; /* secondary iterator of enumeration */
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9 PyObject* en_result; /* result tuple */
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10 PyObject* en_longindex; /* index for sequences >= PY_SSIZE_T_MAX */
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11 } enumobject;
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12
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13 static PyObject *
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14 enum_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
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15 {
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16 enumobject *en;
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17 PyObject *seq = NULL;
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18 PyObject *start = NULL;
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19 static char *kwlist[] = {"iterable", "start", 0};
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20
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21 if (!PyArg_ParseTupleAndKeywords(args, kwds, "O|O:enumerate", kwlist,
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22 &seq, &start))
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23 return NULL;
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24
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25 en = (enumobject *)type->tp_alloc(type, 0);
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26 if (en == NULL)
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27 return NULL;
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28 if (start != NULL) {
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29 start = PyNumber_Index(start);
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30 if (start == NULL) {
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31 Py_DECREF(en);
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32 return NULL;
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33 }
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34 assert(PyLong_Check(start));
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35 en->en_index = PyLong_AsSsize_t(start);
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36 if (en->en_index == -1 && PyErr_Occurred()) {
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37 PyErr_Clear();
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38 en->en_index = PY_SSIZE_T_MAX;
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39 en->en_longindex = start;
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40 } else {
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41 en->en_longindex = NULL;
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42 Py_DECREF(start);
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43 }
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44 } else {
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45 en->en_index = 0;
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46 en->en_longindex = NULL;
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47 }
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48 en->en_sit = PyObject_GetIter(seq);
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49 if (en->en_sit == NULL) {
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50 Py_DECREF(en);
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51 return NULL;
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52 }
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53 en->en_result = PyTuple_Pack(2, Py_None, Py_None);
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54 if (en->en_result == NULL) {
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55 Py_DECREF(en);
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56 return NULL;
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57 }
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58 return (PyObject *)en;
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59 }
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60
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61 static void
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62 enum_dealloc(enumobject *en)
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63 {
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64 PyObject_GC_UnTrack(en);
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65 Py_XDECREF(en->en_sit);
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66 Py_XDECREF(en->en_result);
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67 Py_XDECREF(en->en_longindex);
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68 Py_TYPE(en)->tp_free(en);
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69 }
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70
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71 static int
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72 enum_traverse(enumobject *en, visitproc visit, void *arg)
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73 {
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74 Py_VISIT(en->en_sit);
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75 Py_VISIT(en->en_result);
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76 Py_VISIT(en->en_longindex);
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77 return 0;
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78 }
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79
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80 static PyObject *
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81 enum_next_long(enumobject *en, PyObject* next_item)
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82 {
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83 static PyObject *one = NULL;
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84 PyObject *result = en->en_result;
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85 PyObject *next_index;
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86 PyObject *stepped_up;
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87
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88 if (en->en_longindex == NULL) {
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89 en->en_longindex = PyLong_FromSsize_t(PY_SSIZE_T_MAX);
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90 if (en->en_longindex == NULL)
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91 return NULL;
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92 }
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93 if (one == NULL) {
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94 one = PyLong_FromLong(1);
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95 if (one == NULL)
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96 return NULL;
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97 }
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98 next_index = en->en_longindex;
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99 assert(next_index != NULL);
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100 stepped_up = PyNumber_Add(next_index, one);
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101 if (stepped_up == NULL)
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102 return NULL;
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103 en->en_longindex = stepped_up;
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104
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105 if (result->ob_refcnt == 1) {
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106 Py_INCREF(result);
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107 Py_DECREF(PyTuple_GET_ITEM(result, 0));
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108 Py_DECREF(PyTuple_GET_ITEM(result, 1));
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109 } else {
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110 result = PyTuple_New(2);
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111 if (result == NULL) {
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112 Py_DECREF(next_index);
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113 Py_DECREF(next_item);
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114 return NULL;
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115 }
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116 }
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117 PyTuple_SET_ITEM(result, 0, next_index);
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118 PyTuple_SET_ITEM(result, 1, next_item);
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119 return result;
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120 }
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121
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122 static PyObject *
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123 enum_next(enumobject *en)
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124 {
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125 PyObject *next_index;
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126 PyObject *next_item;
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127 PyObject *result = en->en_result;
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128 PyObject *it = en->en_sit;
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129
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130 next_item = (*Py_TYPE(it)->tp_iternext)(it);
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131 if (next_item == NULL)
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132 return NULL;
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133
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134 if (en->en_index == PY_SSIZE_T_MAX)
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135 return enum_next_long(en, next_item);
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136
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137 next_index = PyLong_FromSsize_t(en->en_index);
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138 if (next_index == NULL) {
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139 Py_DECREF(next_item);
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140 return NULL;
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141 }
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142 en->en_index++;
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143
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144 if (result->ob_refcnt == 1) {
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145 Py_INCREF(result);
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146 Py_DECREF(PyTuple_GET_ITEM(result, 0));
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147 Py_DECREF(PyTuple_GET_ITEM(result, 1));
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148 } else {
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149 result = PyTuple_New(2);
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150 if (result == NULL) {
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151 Py_DECREF(next_index);
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152 Py_DECREF(next_item);
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153 return NULL;
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154 }
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155 }
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156 PyTuple_SET_ITEM(result, 0, next_index);
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157 PyTuple_SET_ITEM(result, 1, next_item);
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158 return result;
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159 }
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160
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161 static PyObject *
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162 enum_reduce(enumobject *en)
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163 {
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164 if (en->en_longindex != NULL)
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165 return Py_BuildValue("O(OO)", Py_TYPE(en), en->en_sit, en->en_longindex);
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166 else
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167 return Py_BuildValue("O(On)", Py_TYPE(en), en->en_sit, en->en_index);
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168 }
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169
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170 PyDoc_STRVAR(reduce_doc, "Return state information for pickling.");
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171
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172 static PyMethodDef enum_methods[] = {
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173 {"__reduce__", (PyCFunction)enum_reduce, METH_NOARGS, reduce_doc},
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174 {NULL, NULL} /* sentinel */
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175 };
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176
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177 PyDoc_STRVAR(enum_doc,
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178 "enumerate(iterable[, start]) -> iterator for index, value of iterable\n"
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179 "\n"
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180 "Return an enumerate object. iterable must be another object that supports\n"
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181 "iteration. The enumerate object yields pairs containing a count (from\n"
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182 "start, which defaults to zero) and a value yielded by the iterable argument.\n"
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183 "enumerate is useful for obtaining an indexed list:\n"
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184 " (0, seq[0]), (1, seq[1]), (2, seq[2]), ...");
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185
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186 PyTypeObject PyEnum_Type = {
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187 PyVarObject_HEAD_INIT(&PyType_Type, 0)
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188 "enumerate", /* tp_name */
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189 sizeof(enumobject), /* tp_basicsize */
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190 0, /* tp_itemsize */
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191 /* methods */
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192 (destructor)enum_dealloc, /* tp_dealloc */
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193 0, /* tp_print */
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194 0, /* tp_getattr */
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195 0, /* tp_setattr */
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196 0, /* tp_reserved */
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197 0, /* tp_repr */
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198 0, /* tp_as_number */
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199 0, /* tp_as_sequence */
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200 0, /* tp_as_mapping */
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201 0, /* tp_hash */
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202 0, /* tp_call */
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203 0, /* tp_str */
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204 PyObject_GenericGetAttr, /* tp_getattro */
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205 0, /* tp_setattro */
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206 0, /* tp_as_buffer */
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207 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
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208 Py_TPFLAGS_BASETYPE, /* tp_flags */
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209 enum_doc, /* tp_doc */
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210 (traverseproc)enum_traverse, /* tp_traverse */
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211 0, /* tp_clear */
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212 0, /* tp_richcompare */
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213 0, /* tp_weaklistoffset */
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214 PyObject_SelfIter, /* tp_iter */
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215 (iternextfunc)enum_next, /* tp_iternext */
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216 enum_methods, /* tp_methods */
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217 0, /* tp_members */
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218 0, /* tp_getset */
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219 0, /* tp_base */
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220 0, /* tp_dict */
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221 0, /* tp_descr_get */
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222 0, /* tp_descr_set */
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223 0, /* tp_dictoffset */
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224 0, /* tp_init */
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225 PyType_GenericAlloc, /* tp_alloc */
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226 enum_new, /* tp_new */
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227 PyObject_GC_Del, /* tp_free */
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228 };
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229
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230 /* Reversed Object ***************************************************************/
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231
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232 typedef struct {
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233 PyObject_HEAD
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234 Py_ssize_t index;
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235 PyObject* seq;
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236 } reversedobject;
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237
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238 static PyObject *
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239 reversed_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
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240 {
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241 Py_ssize_t n;
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242 PyObject *seq, *reversed_meth;
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243 reversedobject *ro;
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244 _Py_IDENTIFIER(__reversed__);
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245
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246 if (type == &PyReversed_Type && !_PyArg_NoKeywords("reversed()", kwds))
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247 return NULL;
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248
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249 if (!PyArg_UnpackTuple(args, "reversed", 1, 1, &seq) )
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250 return NULL;
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251
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252 reversed_meth = _PyObject_LookupSpecial(seq, &PyId___reversed__);
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253 if (reversed_meth != NULL) {
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254 PyObject *res = PyObject_CallFunctionObjArgs(reversed_meth, NULL);
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255 Py_DECREF(reversed_meth);
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256 return res;
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257 }
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258 else if (PyErr_Occurred())
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259 return NULL;
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260
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261 if (!PySequence_Check(seq)) {
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262 PyErr_SetString(PyExc_TypeError,
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263 "argument to reversed() must be a sequence");
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264 return NULL;
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265 }
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266
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267 n = PySequence_Size(seq);
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268 if (n == -1)
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269 return NULL;
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270
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271 ro = (reversedobject *)type->tp_alloc(type, 0);
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272 if (ro == NULL)
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273 return NULL;
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274
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275 ro->index = n-1;
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276 Py_INCREF(seq);
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277 ro->seq = seq;
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278 return (PyObject *)ro;
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279 }
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280
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281 static void
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282 reversed_dealloc(reversedobject *ro)
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283 {
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284 PyObject_GC_UnTrack(ro);
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285 Py_XDECREF(ro->seq);
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286 Py_TYPE(ro)->tp_free(ro);
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287 }
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288
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289 static int
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290 reversed_traverse(reversedobject *ro, visitproc visit, void *arg)
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291 {
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292 Py_VISIT(ro->seq);
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293 return 0;
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294 }
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295
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296 static PyObject *
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297 reversed_next(reversedobject *ro)
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298 {
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299 PyObject *item;
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300 Py_ssize_t index = ro->index;
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301
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302 if (index >= 0) {
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303 item = PySequence_GetItem(ro->seq, index);
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304 if (item != NULL) {
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305 ro->index--;
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306 return item;
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307 }
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308 if (PyErr_ExceptionMatches(PyExc_IndexError) ||
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309 PyErr_ExceptionMatches(PyExc_StopIteration))
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310 PyErr_Clear();
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311 }
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312 ro->index = -1;
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313 Py_CLEAR(ro->seq);
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314 return NULL;
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315 }
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316
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317 PyDoc_STRVAR(reversed_doc,
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318 "reversed(sequence) -> reverse iterator over values of the sequence\n"
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319 "\n"
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320 "Return a reverse iterator");
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321
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322 static PyObject *
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323 reversed_len(reversedobject *ro)
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324 {
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325 Py_ssize_t position, seqsize;
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326
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327 if (ro->seq == NULL)
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328 return PyLong_FromLong(0);
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329 seqsize = PySequence_Size(ro->seq);
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330 if (seqsize == -1)
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331 return NULL;
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332 position = ro->index + 1;
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333 return PyLong_FromSsize_t((seqsize < position) ? 0 : position);
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334 }
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335
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336 PyDoc_STRVAR(length_hint_doc, "Private method returning an estimate of len(list(it)).");
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337
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338 static PyObject *
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339 reversed_reduce(reversedobject *ro)
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340 {
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341 if (ro->seq)
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342 return Py_BuildValue("O(O)n", Py_TYPE(ro), ro->seq, ro->index);
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343 else
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344 return Py_BuildValue("O(())", Py_TYPE(ro));
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345 }
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346
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347 static PyObject *
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348 reversed_setstate(reversedobject *ro, PyObject *state)
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349 {
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350 Py_ssize_t index = PyLong_AsSsize_t(state);
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351 if (index == -1 && PyErr_Occurred())
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352 return NULL;
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353 if (ro->seq != 0) {
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354 Py_ssize_t n = PySequence_Size(ro->seq);
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355 if (n < 0)
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356 return NULL;
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357 if (index < -1)
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358 index = -1;
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359 else if (index > n-1)
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360 index = n-1;
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361 ro->index = index;
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362 }
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363 Py_RETURN_NONE;
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364 }
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365
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366 PyDoc_STRVAR(setstate_doc, "Set state information for unpickling.");
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367
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368 static PyMethodDef reversediter_methods[] = {
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369 {"__length_hint__", (PyCFunction)reversed_len, METH_NOARGS, length_hint_doc},
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370 {"__reduce__", (PyCFunction)reversed_reduce, METH_NOARGS, reduce_doc},
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371 {"__setstate__", (PyCFunction)reversed_setstate, METH_O, setstate_doc},
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372 {NULL, NULL} /* sentinel */
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373 };
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374
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375 PyTypeObject PyReversed_Type = {
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376 PyVarObject_HEAD_INIT(&PyType_Type, 0)
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377 "reversed", /* tp_name */
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378 sizeof(reversedobject), /* tp_basicsize */
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379 0, /* tp_itemsize */
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380 /* methods */
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381 (destructor)reversed_dealloc, /* tp_dealloc */
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382 0, /* tp_print */
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383 0, /* tp_getattr */
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384 0, /* tp_setattr */
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385 0, /* tp_reserved */
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386 0, /* tp_repr */
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387 0, /* tp_as_number */
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388 0, /* tp_as_sequence */
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389 0, /* tp_as_mapping */
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390 0, /* tp_hash */
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391 0, /* tp_call */
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392 0, /* tp_str */
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393 PyObject_GenericGetAttr, /* tp_getattro */
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394 0, /* tp_setattro */
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395 0, /* tp_as_buffer */
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396 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
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397 Py_TPFLAGS_BASETYPE, /* tp_flags */
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398 reversed_doc, /* tp_doc */
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399 (traverseproc)reversed_traverse,/* tp_traverse */
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400 0, /* tp_clear */
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401 0, /* tp_richcompare */
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402 0, /* tp_weaklistoffset */
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403 PyObject_SelfIter, /* tp_iter */
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404 (iternextfunc)reversed_next, /* tp_iternext */
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405 reversediter_methods, /* tp_methods */
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406 0, /* tp_members */
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407 0, /* tp_getset */
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408 0, /* tp_base */
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409 0, /* tp_dict */
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410 0, /* tp_descr_get */
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411 0, /* tp_descr_set */
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412 0, /* tp_dictoffset */
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413 0, /* tp_init */
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414 PyType_GenericAlloc, /* tp_alloc */
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415 reversed_new, /* tp_new */
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416 PyObject_GC_Del, /* tp_free */
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41c4e143e6e6 Implement and apply PEP 322, reverse iteration
Raymond Hettinger <python@rcn.com>
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417 };