Mercurial > cpython-lru_cache-weakref

annotate Objects/rangeobject.c @ 22194:fc6dc2ea25cf legacy-trunk

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Fix leak of NotImplemented in previous checkin to PyNumber_Add(). If result == Py_NotImplemented, always DECREF it before assigning a new value to result.
author Jeremy Hylton <jeremy@alum.mit.edu>
date Fri, 08 Mar 2002 21:28:54 +0000
parents 070d392042e3
children 1c9ce34d529d d5aad6c581c9
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1
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2 /* Range object implementation */
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3
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4 #include "Python.h"
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5 #include "structmember.h"
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6 #include <string.h>
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7
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8 #define WARN(msg) if (PyErr_Warn(PyExc_DeprecationWarning, msg) < 0) \
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9 return NULL;
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10
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11 typedef struct {
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12 PyObject_HEAD
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13 long start;
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14 long step;
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15 long len;
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16 int reps;
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17 long totlen;
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18 } rangeobject;
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19
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20 static int
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21 long_mul(long i, long j, long *kk)
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22 {
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23 PyObject *a;
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24 PyObject *b;
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25 PyObject *c;
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26
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27 if ((a = PyInt_FromLong(i)) == NULL)
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28 return 0;
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29
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30 if ((b = PyInt_FromLong(j)) == NULL)
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31 return 0;
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32
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33 c = PyNumber_Multiply(a, b);
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34
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35 Py_DECREF(a);
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36 Py_DECREF(b);
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37
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38 if (c == NULL)
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39 return 0;
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40
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41 if (!PyInt_Check(c)) {
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42 Py_DECREF(c);
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43 goto overflow;
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44 }
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45
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46 *kk = PyInt_AS_LONG(c);
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47 Py_DECREF(c);
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48
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49 if (*kk > INT_MAX) {
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50 overflow:
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51 PyErr_SetString(PyExc_OverflowError,
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52 "integer multiplication");
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53 return 0;
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54 }
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55 else
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56 return 1;
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57 }
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58
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59 PyObject *
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60 PyRange_New(long start, long len, long step, int reps)
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61 {
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62 long totlen = -1;
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63 rangeobject *obj = PyObject_NEW(rangeobject, &PyRange_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 (reps != 1)
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69 WARN("PyRange_New's 'repetitions' argument is deprecated");
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70
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71 if (len == 0 || reps <= 0) {
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72 start = 0;
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73 len = 0;
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74 step = 1;
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75 reps = 1;
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76 totlen = 0;
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77 }
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78 else {
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79 long last = start + (len - 1) * step;
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80 if ((step > 0) ?
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81 (last > (PyInt_GetMax() - step)) :
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82 (last < (-1 - PyInt_GetMax() - step))) {
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83 PyErr_SetString(PyExc_OverflowError,
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84 "integer addition");
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85 return NULL;
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86 }
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87 if (! long_mul(len, (long) reps, &totlen)) {
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88 if(!PyErr_ExceptionMatches(PyExc_OverflowError))
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89 return NULL;
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90 PyErr_Clear();
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91 totlen = -1;
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92 }
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93 }
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94
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95 obj->start = start;
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96 obj->len = len;
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97 obj->step = step;
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98 obj->reps = reps;
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99 obj->totlen = totlen;
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100
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101 return (PyObject *) obj;
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102 }
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103
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104 static void
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105 range_dealloc(rangeobject *r)
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106 {
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107 PyObject_DEL(r);
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108 }
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109
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110 static PyObject *
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111 range_item(rangeobject *r, int i)
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112 {
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113 if (i < 0 || i >= r->totlen)
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114 if (r->totlen!=-1) {
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115 PyErr_SetString(PyExc_IndexError,
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116 "xrange object index out of range");
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117 return NULL;
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118 }
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119
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120 return PyInt_FromLong(r->start + (i % r->len) * r->step);
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121 }
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122
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123 static int
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124 range_length(rangeobject *r)
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125 {
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126 if (r->totlen == -1)
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127 PyErr_SetString(PyExc_OverflowError,
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128 "xrange object has too many items");
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129 return r->totlen;
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130 }
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131
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132 static PyObject *
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133 range_repr(rangeobject *r)
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134 {
19476
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diff changeset
135 PyObject *rtn;
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parents: 19301
diff changeset
136
13848
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diff changeset
137 if (r->start == 0 && r->step == 1)
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parents: 19301
diff changeset
138 rtn = PyString_FromFormat("xrange(%ld)",
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diff changeset
139 r->start + r->len * r->step);
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parents: 13847
diff changeset
140
dd042f5a8fa2 Boost buffer sizes in the absence of snprintf on Windows.
Tim Peters <tim.peters@gmail.com>
parents: 13847
diff changeset
141 else if (r->step == 1)
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parents: 19301
diff changeset
142 rtn = PyString_FromFormat("xrange(%ld, %ld)",
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diff changeset
143 r->start,
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Barry Warsaw <barry@python.org>
parents: 19301
diff changeset
144 r->start + r->len * r->step);
13848
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Tim Peters <tim.peters@gmail.com>
parents: 13847
diff changeset
145
dd042f5a8fa2 Boost buffer sizes in the absence of snprintf on Windows.
Tim Peters <tim.peters@gmail.com>
parents: 13847
diff changeset
146 else
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parents: 19301
diff changeset
147 rtn = PyString_FromFormat("xrange(%ld, %ld, %ld)",
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diff changeset
148 r->start,
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parents: 19301
diff changeset
149 r->start + r->len * r->step,
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Barry Warsaw <barry@python.org>
parents: 19301
diff changeset
150 r->step);
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Barry Warsaw <barry@python.org>
parents: 19301
diff changeset
151 if (r->reps != 1) {
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parents: 19301
diff changeset
152 PyObject *extra = PyString_FromFormat(
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153 "(%s * %d)",
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Barry Warsaw <barry@python.org>
parents: 19301
diff changeset
154 PyString_AS_STRING(rtn), r->reps);
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Barry Warsaw <barry@python.org>
parents: 19301
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155 Py_DECREF(rtn);
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Barry Warsaw <barry@python.org>
parents: 19301
diff changeset
156 rtn = extra;
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parents: 19301
diff changeset
157 }
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parents: 19301
diff changeset
158 return rtn;
18436
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159 }
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parents: 18391
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160
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parents: 18391
diff changeset
161 static PyObject *
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diff changeset
162 range_repeat(rangeobject *r, int n)
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parents: 18391
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163 {
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Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
164 long lreps = 0;
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diff changeset
165
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166 WARN("xrange object multiplication is deprecated; "
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167 "convert to list instead");
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parents: 18391
diff changeset
168
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Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
169 if (n <= 0)
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Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
170 return (PyObject *) PyRange_New(0, 0, 1, 1);
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parents: 18391
diff changeset
171
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Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
172 else if (n == 1) {
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Thomas Wouters <thomas@python.org>
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diff changeset
173 Py_INCREF(r);
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Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
174 return (PyObject *) r;
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Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
175 }
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Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
176
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
177 else if (! long_mul((long) r->reps, (long) n, &lreps))
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diff changeset
178 return NULL;
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diff changeset
179
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diff changeset
180 else
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diff changeset
181 return (PyObject *) PyRange_New(
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diff changeset
182 r->start,
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parents: 18391
diff changeset
183 r->len,
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diff changeset
184 r->step,
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Thomas Wouters <thomas@python.org>
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diff changeset
185 (int) lreps);
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Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
186 }
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parents: 18391
diff changeset
187
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
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diff changeset
188 static int
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diff changeset
189 range_compare(rangeobject *r1, rangeobject *r2)
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Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
190 {
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parents: 18391
diff changeset
191
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
192 if (PyErr_Warn(PyExc_DeprecationWarning,
21833
070d392042e3 Fix spelling mistakes. Bugfix candidates.
Neal Norwitz <nnorwitz@gmail.com>
parents: 21189
diff changeset
193 "xrange object comparison is deprecated; "
18436
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diff changeset
194 "convert to list instead") < 0)
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diff changeset
195 return -1;
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diff changeset
196
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
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diff changeset
197 if (r1->start != r2->start)
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diff changeset
198 return r1->start - r2->start;
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diff changeset
199
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
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diff changeset
200 else if (r1->step != r2->step)
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diff changeset
201 return r1->step - r2->step;
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diff changeset
202
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diff changeset
203 else if (r1->len != r2->len)
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diff changeset
204 return r1->len - r2->len;
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diff changeset
205
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
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diff changeset
206 else
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Thomas Wouters <thomas@python.org>
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diff changeset
207 return r1->reps - r2->reps;
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Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
208 }
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
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parents: 18391
diff changeset
209
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
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parents: 18391
diff changeset
210 static PyObject *
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
211 range_slice(rangeobject *r, int low, int high)
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Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
212 {
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
213 WARN("xrange object slicing is deprecated; "
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
214 "convert to list instead");
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Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
215
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
216 if (r->reps != 1) {
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
217 PyErr_SetString(PyExc_TypeError,
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
218 "cannot slice a replicated xrange");
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
219 return NULL;
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
220 }
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
221 if (low < 0)
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
222 low = 0;
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
223 else if (low > r->len)
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
224 low = r->len;
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
225 if (high < 0)
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
226 high = 0;
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
227 if (high < low)
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
228 high = low;
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
229 else if (high > r->len)
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
230 high = r->len;
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
231
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
232 if (low == 0 && high == r->len) {
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
233 Py_INCREF(r);
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
234 return (PyObject *) r;
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
235 }
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
236
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
237 return (PyObject *) PyRange_New(
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
238 low * r->step + r->start,
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
239 high - low,
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Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
240 r->step,
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
241 1);
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
242 }
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
243
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
244 static PyObject *
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
245 range_tolist(rangeobject *self, PyObject *args)
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
246 {
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
247 PyObject *thelist;
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
248 int j;
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
249
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
250 WARN("xrange.tolist() is deprecated; use list(xrange) instead");
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parents: 18391
diff changeset
251
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
252 if (self->totlen == -1)
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
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diff changeset
253 return PyErr_NoMemory();
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
254
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
255 if ((thelist = PyList_New(self->totlen)) == NULL)
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
256 return NULL;
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
257
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
258 for (j = 0; j < self->totlen; ++j)
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
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parents: 18391
diff changeset
259 if ((PyList_SetItem(thelist, j, (PyObject *) PyInt_FromLong(
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
260 self->start + (j % self->len) * self->step))) < 0)
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
261 return NULL;
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
262
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
263 return thelist;
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
264 }
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
Thomas Wouters <thomas@python.org>
parents: 18391
diff changeset
265
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
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parents: 18391
diff changeset
266 static PyObject *
9653272f036f Re-add 'advanced' xrange features, adding DeprecationWarnings as discussed
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parents: 18391
diff changeset
267 range_getattr(rangeobject *r, char *name)
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268 {
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269 PyObject *result;
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270
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271 static PyMethodDef range_methods[] = {
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272 {"tolist", (PyCFunction)range_tolist, METH_NOARGS,
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273 "tolist() -> list\n"
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274 "Return a list object with the same values.\n"
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275 "(This method is deprecated; use list() instead.)"},
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276 {NULL, NULL}
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277 };
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278 static struct memberlist range_members[] = {
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279 {"step", T_LONG, offsetof(rangeobject, step), RO},
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280 {"start", T_LONG, offsetof(rangeobject, start), RO},
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281 {"stop", T_LONG, 0, RO},
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282 {NULL, 0, 0, 0}
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283 };
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284
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285 result = Py_FindMethod(range_methods, (PyObject *) r, name);
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286 if (result == NULL) {
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287 PyErr_Clear();
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288 if (strcmp("stop", name) == 0)
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289 result = PyInt_FromLong(r->start + (r->len * r->step));
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290 else
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291 result = PyMember_Get((char *)r, range_members, name);
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292 if (result)
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293 WARN("xrange object's 'start', 'stop' and 'step' "
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294 "attributes are deprecated");
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295 }
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296 return result;
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297 }
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298
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299 static PySequenceMethods range_as_sequence = {
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300 (inquiry)range_length, /*sq_length*/
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301 0, /*sq_concat*/
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302 (intargfunc)range_repeat, /*sq_repeat*/
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303 (intargfunc)range_item, /*sq_item*/
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304 (intintargfunc)range_slice, /*sq_slice*/
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305 0, /*sq_ass_item*/
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306 0, /*sq_ass_slice*/
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307 0, /*sq_contains*/
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308 };
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309
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310 PyTypeObject PyRange_Type = {
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311 PyObject_HEAD_INIT(&PyType_Type)
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312 0, /* Number of items for varobject */
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313 "xrange", /* Name of this type */
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314 sizeof(rangeobject), /* Basic object size */
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315 0, /* Item size for varobject */
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316 (destructor)range_dealloc, /*tp_dealloc*/
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317 0, /*tp_print*/
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318 (getattrfunc)range_getattr, /*tp_getattr*/
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319 0, /*tp_setattr*/
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320 (cmpfunc)range_compare, /*tp_compare*/
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321 (reprfunc)range_repr, /*tp_repr*/
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322 0, /*tp_as_number*/
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323 &range_as_sequence, /*tp_as_sequence*/
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324 0, /*tp_as_mapping*/
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325 0, /*tp_hash*/
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326 0, /*tp_call*/
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327 0, /*tp_str*/
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328 PyObject_GenericGetAttr, /*tp_getattro*/
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329 0, /*tp_setattro*/
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330 0, /*tp_as_buffer*/
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331 Py_TPFLAGS_DEFAULT, /*tp_flags*/
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332 0, /* tp_doc */
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333 0, /* tp_traverse */
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334 0, /* tp_clear */
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335 0, /* tp_richcompare */
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336 0, /* tp_weaklistoffset */
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337 0, /* tp_iter */
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338 0, /* tp_iternext */
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339 0, /* tp_methods */
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340 0, /* tp_members */
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341 0, /* tp_getset */
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342 0, /* tp_base */
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343 0, /* tp_dict */
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344 };
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345
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346 #undef WARN