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annotate Objects/sliceobject.c @ 19283:b865cd5c1925 legacy-trunk

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Added comments before recently added/assigned slots in the type object, so the backward compatibility issues will be easier to understand. I only added comments indicating additions and assignments back to Python 2.0.
author Fred Drake <fdrake@acm.org>
date Wed, 15 Aug 2001 18:32:33 +0000
parents 09df3254b49d
children 3faabf54b8b8
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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 PyString_FromString("Ellipsis");
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23 }
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24
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25 static PyTypeObject PyEllipsis_Type = {
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26 PyObject_HEAD_INIT(&PyType_Type)
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27 0,
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28 "ellipsis",
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29 0,
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30 0,
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31 0, /*tp_dealloc*/ /*never called*/
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32 0, /*tp_print*/
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33 0, /*tp_getattr*/
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34 0, /*tp_setattr*/
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35 0, /*tp_compare*/
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36 (reprfunc)ellipsis_repr, /*tp_repr*/
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37 0, /*tp_as_number*/
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38 0, /*tp_as_sequence*/
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39 0, /*tp_as_mapping*/
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40 0, /*tp_hash */
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41 };
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42
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43 PyObject _Py_EllipsisObject = {
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44 PyObject_HEAD_INIT(&PyEllipsis_Type)
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45 };
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46
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47
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48 /* Slice object implementation
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49
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50 start, stop, and step are python objects with None indicating no
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51 index is present.
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52 */
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53
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54 PyObject *
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55 PySlice_New(PyObject *start, PyObject *stop, PyObject *step)
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56 {
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57 PySliceObject *obj = PyObject_NEW(PySliceObject, &PySlice_Type);
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58
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59 if (obj == NULL)
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60 return NULL;
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61
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62 if (step == NULL) step = Py_None;
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63 Py_INCREF(step);
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64 if (start == NULL) start = Py_None;
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65 Py_INCREF(start);
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66 if (stop == NULL) stop = Py_None;
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67 Py_INCREF(stop);
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68
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69 obj->step = step;
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70 obj->start = start;
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71 obj->stop = stop;
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72
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73 return (PyObject *) obj;
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74 }
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75
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76 int
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77 PySlice_GetIndices(PySliceObject *r, int length,
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78 int *start, int *stop, int *step)
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79 {
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80 if (r->step == Py_None) {
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81 *step = 1;
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82 } else {
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83 if (!PyInt_Check(r->step)) return -1;
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84 *step = PyInt_AsLong(r->step);
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85 }
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86 if (r->start == Py_None) {
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87 *start = *step < 0 ? length-1 : 0;
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88 } else {
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89 if (!PyInt_Check(r->start)) return -1;
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90 *start = PyInt_AsLong(r->start);
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91 if (*start < 0) *start += length;
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92 }
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93 if (r->stop == Py_None) {
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94 *stop = *step < 0 ? -1 : length;
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95 } else {
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96 if (!PyInt_Check(r->stop)) return -1;
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97 *stop = PyInt_AsLong(r->stop);
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98 if (*stop < 0) *stop += length;
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99 }
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100 if (*stop > length) return -1;
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101 if (*start >= length) return -1;
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102 if (*step == 0) return -1;
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103 return 0;
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104 }
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105
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106 static void
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107 slice_dealloc(PySliceObject *r)
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108 {
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109 Py_DECREF(r->step);
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110 Py_DECREF(r->start);
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111 Py_DECREF(r->stop);
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112 PyObject_DEL(r);
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113 }
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114
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115 static PyObject *
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116 slice_repr(PySliceObject *r)
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117 {
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118 PyObject *s, *comma;
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119
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120 s = PyString_FromString("slice(");
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121 comma = PyString_FromString(", ");
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122 PyString_ConcatAndDel(&s, PyObject_Repr(r->start));
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123 PyString_Concat(&s, comma);
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124 PyString_ConcatAndDel(&s, PyObject_Repr(r->stop));
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125 PyString_Concat(&s, comma);
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126 PyString_ConcatAndDel(&s, PyObject_Repr(r->step));
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127 PyString_ConcatAndDel(&s, PyString_FromString(")"));
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128 Py_DECREF(comma);
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129 return s;
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130 }
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131
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132 static struct memberlist slice_members[] = {
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133 {"start", T_OBJECT, offsetof(PySliceObject, start), READONLY},
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134 {"stop", T_OBJECT, offsetof(PySliceObject, stop), READONLY},
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135 {"step", T_OBJECT, offsetof(PySliceObject, step), READONLY},
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136 {0}
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137 };
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138
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139 static int
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140 slice_compare(PySliceObject *v, PySliceObject *w)
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141 {
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142 int result = 0;
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143
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144 if (v == w)
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145 return 0;
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146
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147 if (PyObject_Cmp(v->start, w->start, &result) < 0)
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148 return -2;
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149 if (result != 0)
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150 return result;
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151 if (PyObject_Cmp(v->stop, w->stop, &result) < 0)
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152 return -2;
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153 if (result != 0)
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154 return result;
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155 if (PyObject_Cmp(v->step, w->step, &result) < 0)
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156 return -2;
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157 return result;
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158 }
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159
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160 PyTypeObject PySlice_Type = {
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161 PyObject_HEAD_INIT(&PyType_Type)
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162 0, /* Number of items for varobject */
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163 "slice", /* Name of this type */
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164 sizeof(PySliceObject), /* Basic object size */
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165 0, /* Item size for varobject */
18933
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166 (destructor)slice_dealloc, /* tp_dealloc */
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167 0, /* tp_print */
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168 0, /* tp_getattr */
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169 0, /* tp_setattr */
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170 (cmpfunc)slice_compare, /* tp_compare */
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171 (reprfunc)slice_repr, /* tp_repr */
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172 0, /* tp_as_number */
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173 0, /* tp_as_sequence */
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174 0, /* tp_as_mapping */
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175 0, /* tp_hash */
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176 0, /* tp_call */
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177 0, /* tp_str */
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178 PyObject_GenericGetAttr, /* tp_getattro */
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179 0, /* tp_setattro */
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180 0, /* tp_as_buffer */
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181 Py_TPFLAGS_DEFAULT, /* tp_flags */
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182 0, /* tp_doc */
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183 0, /* tp_traverse */
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184 0, /* tp_clear */
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185 0, /* tp_richcompare */
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186 0, /* tp_weaklistoffset */
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187 0, /* tp_iter */
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188 0, /* tp_iternext */
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189 0, /* tp_methods */
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190 slice_members, /* tp_members */
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191 0, /* tp_getset */
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192 0, /* tp_base */
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193 0, /* tp_dict */
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194 };