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annotate Objects/sliceobject.c @ 70817:dd775b1561ba

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Fix markup.
author Georg Brandl <georg@python.org>
date Tue, 14 Jun 2011 21:09:55 +0200
parents 62b61abd02b8
children 53c87a0275ab 84c3be27b4c7
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1 /*
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2 Written by Jim Hugunin and Chris Chase.
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3
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4 This includes both the singular ellipsis object and slice objects.
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5
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6 Guido, feel free to do whatever you want in the way of copyrights
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7 for this file.
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8 */
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9
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10 /*
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11 Py_Ellipsis encodes the '...' rubber index token. It is similar to
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12 the Py_NoneStruct in that there is no way to create other objects of
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13 this type and there is exactly one in existence.
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14 */
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15
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16 #include "Python.h"
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17 #include "structmember.h"
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18
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19 static PyObject *
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20 ellipsis_repr(PyObject *op)
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21 {
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22 return PyUnicode_FromString("Ellipsis");
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23 }
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24
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25 PyTypeObject PyEllipsis_Type = {
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26 PyVarObject_HEAD_INIT(&PyType_Type, 0)
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27 "ellipsis", /* tp_name */
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28 0, /* tp_basicsize */
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29 0, /* tp_itemsize */
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30 0, /*never called*/ /* tp_dealloc */
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31 0, /* tp_print */
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32 0, /* tp_getattr */
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33 0, /* tp_setattr */
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34 0, /* tp_reserved */
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35 ellipsis_repr, /* tp_repr */
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36 0, /* tp_as_number */
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37 0, /* tp_as_sequence */
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38 0, /* tp_as_mapping */
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39 0, /* tp_hash */
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40 0, /* tp_call */
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41 0, /* tp_str */
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42 PyObject_GenericGetAttr, /* tp_getattro */
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43 0, /* tp_setattro */
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44 0, /* tp_as_buffer */
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45 Py_TPFLAGS_DEFAULT, /* tp_flags */
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46 };
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47
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48 PyObject _Py_EllipsisObject = {
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49 _PyObject_EXTRA_INIT
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50 1, &PyEllipsis_Type
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51 };
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52
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53
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54 /* Slice object implementation
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55
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56 start, stop, and step are python objects with None indicating no
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57 index is present.
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58 */
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59
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60 PyObject *
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61 PySlice_New(PyObject *start, PyObject *stop, PyObject *step)
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62 {
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63 PySliceObject *obj = PyObject_New(PySliceObject, &PySlice_Type);
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64
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65 if (obj == NULL)
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66 return NULL;
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67
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68 if (step == NULL) step = Py_None;
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69 Py_INCREF(step);
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70 if (start == NULL) start = Py_None;
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71 Py_INCREF(start);
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72 if (stop == NULL) stop = Py_None;
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73 Py_INCREF(stop);
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74
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75 obj->step = step;
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76 obj->start = start;
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77 obj->stop = stop;
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78
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79 return (PyObject *) obj;
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80 }
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81
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82 PyObject *
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83 _PySlice_FromIndices(Py_ssize_t istart, Py_ssize_t istop)
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84 {
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85 PyObject *start, *end, *slice;
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86 start = PyLong_FromSsize_t(istart);
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87 if (!start)
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88 return NULL;
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89 end = PyLong_FromSsize_t(istop);
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90 if (!end) {
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91 Py_DECREF(start);
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92 return NULL;
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93 }
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94
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95 slice = PySlice_New(start, end, NULL);
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96 Py_DECREF(start);
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97 Py_DECREF(end);
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98 return slice;
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99 }
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100
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101 int
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102 PySlice_GetIndices(PyObject *_r, Py_ssize_t length,
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103 Py_ssize_t *start, Py_ssize_t *stop, Py_ssize_t *step)
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104 {
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105 PySliceObject *r = (PySliceObject*)_r;
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106 /* XXX support long ints */
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107 if (r->step == Py_None) {
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108 *step = 1;
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109 } else {
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110 if (!PyLong_Check(r->step)) return -1;
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111 *step = PyLong_AsSsize_t(r->step);
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112 }
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113 if (r->start == Py_None) {
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114 *start = *step < 0 ? length-1 : 0;
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115 } else {
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116 if (!PyLong_Check(r->start)) return -1;
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117 *start = PyLong_AsSsize_t(r->start);
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118 if (*start < 0) *start += length;
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119 }
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120 if (r->stop == Py_None) {
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121 *stop = *step < 0 ? -1 : length;
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122 } else {
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123 if (!PyLong_Check(r->stop)) return -1;
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124 *stop = PyLong_AsSsize_t(r->stop);
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125 if (*stop < 0) *stop += length;
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126 }
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127 if (*stop > length) return -1;
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128 if (*start >= length) return -1;
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129 if (*step == 0) return -1;
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130 return 0;
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131 }
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132
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133 int
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134 PySlice_GetIndicesEx(PyObject *_r, Py_ssize_t length,
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135 Py_ssize_t *start, Py_ssize_t *stop, Py_ssize_t *step,
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136 Py_ssize_t *slicelength)
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137 {
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138 PySliceObject *r = (PySliceObject*)_r;
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139 /* this is harder to get right than you might think */
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140
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141 Py_ssize_t defstart, defstop;
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142
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143 if (r->step == Py_None) {
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144 *step = 1;
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145 }
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146 else {
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147 if (!_PyEval_SliceIndex(r->step, step)) return -1;
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148 if (*step == 0) {
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149 PyErr_SetString(PyExc_ValueError,
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150 "slice step cannot be zero");
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151 return -1;
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152 }
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153 /* Here *step might be -PY_SSIZE_T_MAX-1; in this case we replace it
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154 * with -PY_SSIZE_T_MAX. This doesn't affect the semantics, and it
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155 * guards against later undefined behaviour resulting from code that
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156 * does "step = -step" as part of a slice reversal.
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157 */
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158 if (*step < -PY_SSIZE_T_MAX)
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159 *step = -PY_SSIZE_T_MAX;
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160 }
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161
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162 defstart = *step < 0 ? length-1 : 0;
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163 defstop = *step < 0 ? -1 : length;
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164
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165 if (r->start == Py_None) {
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166 *start = defstart;
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167 }
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168 else {
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169 if (!_PyEval_SliceIndex(r->start, start)) return -1;
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170 if (*start < 0) *start += length;
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171 if (*start < 0) *start = (*step < 0) ? -1 : 0;
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172 if (*start >= length)
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173 *start = (*step < 0) ? length - 1 : length;
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174 }
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175
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176 if (r->stop == Py_None) {
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177 *stop = defstop;
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178 }
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179 else {
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180 if (!_PyEval_SliceIndex(r->stop, stop)) return -1;
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181 if (*stop < 0) *stop += length;
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182 if (*stop < 0) *stop = (*step < 0) ? -1 : 0;
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183 if (*stop >= length)
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184 *stop = (*step < 0) ? length - 1 : length;
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185 }
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186
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187 if ((*step < 0 && *stop >= *start)
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188 || (*step > 0 && *start >= *stop)) {
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189 *slicelength = 0;
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190 }
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191 else if (*step < 0) {
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192 *slicelength = (*stop-*start+1)/(*step)+1;
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193 }
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194 else {
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195 *slicelength = (*stop-*start-1)/(*step)+1;
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196 }
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197
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198 return 0;
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199 }
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200
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201 static PyObject *
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202 slice_new(PyTypeObject *type, PyObject *args, PyObject *kw)
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203 {
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204 PyObject *start, *stop, *step;
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205
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206 start = stop = step = NULL;
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207
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208 if (!_PyArg_NoKeywords("slice()", kw))
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209 return NULL;
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210
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211 if (!PyArg_UnpackTuple(args, "slice", 1, 3, &start, &stop, &step))
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212 return NULL;
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213
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214 /* This swapping of stop and start is to maintain similarity with
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215 range(). */
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216 if (stop == NULL) {
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217 stop = start;
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218 start = NULL;
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219 }
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220 return PySlice_New(start, stop, step);
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221 }
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222
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223 PyDoc_STRVAR(slice_doc,
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224 "slice([start,] stop[, step])\n\
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225 \n\
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226 Create a slice object. This is used for extended slicing (e.g. a[0:10:2]).");
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227
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228 static void
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229 slice_dealloc(PySliceObject *r)
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230 {
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231 Py_DECREF(r->step);
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232 Py_DECREF(r->start);
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233 Py_DECREF(r->stop);
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234 PyObject_Del(r);
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235 }
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236
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237 static PyObject *
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238 slice_repr(PySliceObject *r)
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239 {
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240 return PyUnicode_FromFormat("slice(%R, %R, %R)", r->start, r->stop, r->step);
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241 }
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242
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243 static PyMemberDef slice_members[] = {
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244 {"start", T_OBJECT, offsetof(PySliceObject, start), READONLY},
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245 {"stop", T_OBJECT, offsetof(PySliceObject, stop), READONLY},
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246 {"step", T_OBJECT, offsetof(PySliceObject, step), READONLY},
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247 {0}
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248 };
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249
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250 static PyObject*
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251 slice_indices(PySliceObject* self, PyObject* len)
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252 {
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253 Py_ssize_t ilen, start, stop, step, slicelength;
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254
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255 ilen = PyNumber_AsSsize_t(len, PyExc_OverflowError);
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256
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257 if (ilen == -1 && PyErr_Occurred()) {
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258 return NULL;
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259 }
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260
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261 if (PySlice_GetIndicesEx((PyObject*)self, ilen, &start, &stop,
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262 &step, &slicelength) < 0) {
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263 return NULL;
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264 }
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265
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266 return Py_BuildValue("(nnn)", start, stop, step);
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267 }
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268
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269 PyDoc_STRVAR(slice_indices_doc,
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270 "S.indices(len) -> (start, stop, stride)\n\
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271 \n\
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272 Assuming a sequence of length len, calculate the start and stop\n\
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273 indices, and the stride length of the extended slice described by\n\
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274 S. Out of bounds indices are clipped in a manner consistent with the\n\
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275 handling of normal slices.");
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276
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277 static PyObject *
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278 slice_reduce(PySliceObject* self)
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279 {
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280 return Py_BuildValue("O(OOO)", Py_TYPE(self), self->start, self->stop, self->step);
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281 }
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282
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283 PyDoc_STRVAR(reduce_doc, "Return state information for pickling.");
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284
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285 static PyMethodDef slice_methods[] = {
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286 {"indices", (PyCFunction)slice_indices,
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287 METH_O, slice_indices_doc},
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288 {"__reduce__", (PyCFunction)slice_reduce,
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289 METH_NOARGS, reduce_doc},
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290 {NULL, NULL}
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291 };
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292
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293 static PyObject *
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294 slice_richcompare(PyObject *v, PyObject *w, int op)
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295 {
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296 PyObject *t1;
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297 PyObject *t2;
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298 PyObject *res;
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299
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300 if (!PySlice_Check(v) || !PySlice_Check(w)) {
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301 Py_INCREF(Py_NotImplemented);
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302 return Py_NotImplemented;
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303 }
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304
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305 if (v == w) {
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306 /* XXX Do we really need this shortcut?
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307 There's a unit test for it, but is that fair? */
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308 switch (op) {
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309 case Py_EQ:
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310 case Py_LE:
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311 case Py_GE:
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312 res = Py_True;
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313 break;
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314 default:
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315 res = Py_False;
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316 break;
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317 }
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318 Py_INCREF(res);
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319 return res;
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320 }
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321
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322 t1 = PyTuple_New(3);
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323 t2 = PyTuple_New(3);
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324 if (t1 == NULL || t2 == NULL)
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325 return NULL;
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326
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327 PyTuple_SET_ITEM(t1, 0, ((PySliceObject *)v)->start);
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328 PyTuple_SET_ITEM(t1, 1, ((PySliceObject *)v)->stop);
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329 PyTuple_SET_ITEM(t1, 2, ((PySliceObject *)v)->step);
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330 PyTuple_SET_ITEM(t2, 0, ((PySliceObject *)w)->start);
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331 PyTuple_SET_ITEM(t2, 1, ((PySliceObject *)w)->stop);
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332 PyTuple_SET_ITEM(t2, 2, ((PySliceObject *)w)->step);
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333
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334 res = PyObject_RichCompare(t1, t2, op);
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335
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336 PyTuple_SET_ITEM(t1, 0, NULL);
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337 PyTuple_SET_ITEM(t1, 1, NULL);
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338 PyTuple_SET_ITEM(t1, 2, NULL);
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339 PyTuple_SET_ITEM(t2, 0, NULL);
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340 PyTuple_SET_ITEM(t2, 1, NULL);
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341 PyTuple_SET_ITEM(t2, 2, NULL);
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342
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343 Py_DECREF(t1);
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344 Py_DECREF(t2);
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345
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346 return res;
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347 }
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348
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349 PyTypeObject PySlice_Type = {
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350 PyVarObject_HEAD_INIT(&PyType_Type, 0)
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351 "slice", /* Name of this type */
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352 sizeof(PySliceObject), /* Basic object size */
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353 0, /* Item size for varobject */
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354 (destructor)slice_dealloc, /* tp_dealloc */
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355 0, /* tp_print */
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356 0, /* tp_getattr */
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357 0, /* tp_setattr */
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358 0, /* tp_reserved */
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359 (reprfunc)slice_repr, /* tp_repr */
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360 0, /* tp_as_number */
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361 0, /* tp_as_sequence */
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362 0, /* tp_as_mapping */
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363 PyObject_HashNotImplemented, /* tp_hash */
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364 0, /* tp_call */
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365 0, /* tp_str */
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366 PyObject_GenericGetAttr, /* tp_getattro */
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367 0, /* tp_setattro */
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368 0, /* tp_as_buffer */
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369 Py_TPFLAGS_DEFAULT, /* tp_flags */
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370 slice_doc, /* tp_doc */
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371 0, /* tp_traverse */
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372 0, /* tp_clear */
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373 slice_richcompare, /* tp_richcompare */
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374 0, /* tp_weaklistoffset */
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375 0, /* tp_iter */
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376 0, /* tp_iternext */
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377 slice_methods, /* tp_methods */
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378 slice_members, /* tp_members */
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379 0, /* tp_getset */
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380 0, /* tp_base */
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381 0, /* tp_dict */
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382 0, /* tp_descr_get */
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383 0, /* tp_descr_set */
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384 0, /* tp_dictoffset */
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385 0, /* tp_init */
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386 0, /* tp_alloc */
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387 slice_new, /* tp_new */
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388 };