Mercurial > cpython-lru_cache-weakref

annotate Objects/structseq.c @ 75815:ebffdfa529cd 3.2

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3.2.3rc1 done
author Georg Brandl <georg@python.org>
date Sat, 25 Feb 2012 18:30:26 +0100
parents 7f267a650a1d
children f5e0561e9aa9
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1 /* Implementation helper: a struct that looks like a tuple. See timemodule
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2 and posixmodule for example uses. */
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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
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7 static char visible_length_key[] = "n_sequence_fields";
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8 static char real_length_key[] = "n_fields";
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9 static char unnamed_fields_key[] = "n_unnamed_fields";
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10
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11 /* Fields with this name have only a field index, not a field name.
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12 They are only allowed for indices < n_visible_fields. */
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13 char *PyStructSequence_UnnamedField = "unnamed field";
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14
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15 #define VISIBLE_SIZE(op) Py_SIZE(op)
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16 #define VISIBLE_SIZE_TP(tp) PyLong_AsLong( \
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17 PyDict_GetItemString((tp)->tp_dict, visible_length_key))
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19 #define REAL_SIZE_TP(tp) PyLong_AsLong( \
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20 PyDict_GetItemString((tp)->tp_dict, real_length_key))
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21 #define REAL_SIZE(op) REAL_SIZE_TP(Py_TYPE(op))
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23 #define UNNAMED_FIELDS_TP(tp) PyLong_AsLong( \
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24 PyDict_GetItemString((tp)->tp_dict, unnamed_fields_key))
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25 #define UNNAMED_FIELDS(op) UNNAMED_FIELDS_TP(Py_TYPE(op))
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27
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28 PyObject *
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29 PyStructSequence_New(PyTypeObject *type)
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30 {
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31 PyStructSequence *obj;
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32 Py_ssize_t size = REAL_SIZE_TP(type), i;
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33
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34 obj = PyObject_GC_NewVar(PyStructSequence, type, size);
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35 if (obj == NULL)
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36 return NULL;
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37 /* Hack the size of the variable object, so invisible fields don't appear
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38 to Python code. */
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39 Py_SIZE(obj) = VISIBLE_SIZE_TP(type);
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40 for (i = 0; i < size; i++)
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41 obj->ob_item[i] = NULL;
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42
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43 return (PyObject*)obj;
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44 }
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45
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46 void
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47 PyStructSequence_SetItem(PyObject* op, Py_ssize_t i, PyObject* v)
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48 {
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49 PyStructSequence_SET_ITEM(op, i, v);
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50 }
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51
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52 PyObject*
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53 PyStructSequence_GetItem(PyObject* op, Py_ssize_t i)
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54 {
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55 return PyStructSequence_GET_ITEM(op, i);
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56 }
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57
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58 static void
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59 structseq_dealloc(PyStructSequence *obj)
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60 {
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61 Py_ssize_t i, size;
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62
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63 size = REAL_SIZE(obj);
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64 for (i = 0; i < size; ++i) {
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65 Py_XDECREF(obj->ob_item[i]);
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66 }
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67 PyObject_GC_Del(obj);
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68 }
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69
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70 static PyObject *
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71 structseq_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
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72 {
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73 PyObject *arg = NULL;
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74 PyObject *dict = NULL;
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75 PyObject *ob;
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76 PyStructSequence *res = NULL;
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77 Py_ssize_t len, min_len, max_len, i, n_unnamed_fields;
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78 static char *kwlist[] = {"sequence", "dict", 0};
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79
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80 if (!PyArg_ParseTupleAndKeywords(args, kwds, "O|O:structseq",
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81 kwlist, &arg, &dict))
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82 return NULL;
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83
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84 arg = PySequence_Fast(arg, "constructor requires a sequence");
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85
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86 if (!arg) {
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87 return NULL;
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88 }
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89
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90 if (dict && !PyDict_Check(dict)) {
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91 PyErr_Format(PyExc_TypeError,
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92 "%.500s() takes a dict as second arg, if any",
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93 type->tp_name);
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94 Py_DECREF(arg);
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95 return NULL;
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96 }
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97
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98 len = PySequence_Fast_GET_SIZE(arg);
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99 min_len = VISIBLE_SIZE_TP(type);
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100 max_len = REAL_SIZE_TP(type);
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101 n_unnamed_fields = UNNAMED_FIELDS_TP(type);
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102
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103 if (min_len != max_len) {
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104 if (len < min_len) {
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105 PyErr_Format(PyExc_TypeError,
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106 "%.500s() takes an at least %zd-sequence (%zd-sequence given)",
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107 type->tp_name, min_len, len);
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108 Py_DECREF(arg);
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109 return NULL;
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110 }
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111
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112 if (len > max_len) {
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113 PyErr_Format(PyExc_TypeError,
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114 "%.500s() takes an at most %zd-sequence (%zd-sequence given)",
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115 type->tp_name, max_len, len);
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116 Py_DECREF(arg);
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117 return NULL;
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118 }
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119 }
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120 else {
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121 if (len != min_len) {
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122 PyErr_Format(PyExc_TypeError,
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123 "%.500s() takes a %zd-sequence (%zd-sequence given)",
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124 type->tp_name, min_len, len);
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125 Py_DECREF(arg);
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126 return NULL;
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127 }
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128 }
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129
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130 res = (PyStructSequence*) PyStructSequence_New(type);
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131 if (res == NULL) {
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132 Py_DECREF(arg);
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133 return NULL;
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134 }
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135 for (i = 0; i < len; ++i) {
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136 PyObject *v = PySequence_Fast_GET_ITEM(arg, i);
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137 Py_INCREF(v);
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138 res->ob_item[i] = v;
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139 }
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140 for (; i < max_len; ++i) {
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141 if (dict && (ob = PyDict_GetItemString(
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142 dict, type->tp_members[i-n_unnamed_fields].name))) {
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143 }
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144 else {
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145 ob = Py_None;
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146 }
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147 Py_INCREF(ob);
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148 res->ob_item[i] = ob;
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149 }
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150
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151 Py_DECREF(arg);
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152 return (PyObject*) res;
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153 }
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154
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155
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156 static PyObject *
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157 structseq_repr(PyStructSequence *obj)
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158 {
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159 /* buffer and type size were chosen well considered. */
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160 #define REPR_BUFFER_SIZE 512
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161 #define TYPE_MAXSIZE 100
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162
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163 PyTypeObject *typ = Py_TYPE(obj);
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164 int i, removelast = 0;
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165 Py_ssize_t len;
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166 char buf[REPR_BUFFER_SIZE];
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167 char *endofbuf, *pbuf = buf;
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168
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169 /* pointer to end of writeable buffer; safes space for "...)\0" */
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170 endofbuf= &buf[REPR_BUFFER_SIZE-5];
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171
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172 /* "typename(", limited to TYPE_MAXSIZE */
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173 len = strlen(typ->tp_name) > TYPE_MAXSIZE ? TYPE_MAXSIZE :
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174 strlen(typ->tp_name);
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175 strncpy(pbuf, typ->tp_name, len);
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176 pbuf += len;
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177 *pbuf++ = '(';
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178
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179 for (i=0; i < VISIBLE_SIZE(obj); i++) {
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180 PyObject *val, *repr;
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181 char *cname, *crepr;
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182
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183 cname = typ->tp_members[i].name;
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184 if (cname == NULL) {
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185 PyErr_Format(PyExc_SystemError, "In structseq_repr(), member %d name is NULL"
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186 " for type %.500s", i, typ->tp_name);
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187 return NULL;
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188 }
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189 val = PyStructSequence_GET_ITEM(obj, i);
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190 repr = PyObject_Repr(val);
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191 if (repr == NULL)
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192 return NULL;
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193 crepr = _PyUnicode_AsString(repr);
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194 if (crepr == NULL) {
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195 Py_DECREF(repr);
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196 return NULL;
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197 }
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198
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199 /* + 3: keep space for "=" and ", " */
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200 len = strlen(cname) + strlen(crepr) + 3;
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201 if ((pbuf+len) <= endofbuf) {
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202 strcpy(pbuf, cname);
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203 pbuf += strlen(cname);
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204 *pbuf++ = '=';
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205 strcpy(pbuf, crepr);
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206 pbuf += strlen(crepr);
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207 *pbuf++ = ',';
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208 *pbuf++ = ' ';
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209 removelast = 1;
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210 Py_DECREF(repr);
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211 }
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212 else {
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213 strcpy(pbuf, "...");
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214 pbuf += 3;
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215 removelast = 0;
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216 Py_DECREF(repr);
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217 break;
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218 }
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219 }
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220 if (removelast) {
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221 /* overwrite last ", " */
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222 pbuf-=2;
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223 }
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224 *pbuf++ = ')';
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225 *pbuf = '\0';
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226
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227 return PyUnicode_FromString(buf);
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228 }
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229
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230 static PyObject *
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231 structseq_reduce(PyStructSequence* self)
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232 {
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233 PyObject* tup;
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234 PyObject* dict;
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235 PyObject* result;
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236 Py_ssize_t n_fields, n_visible_fields, n_unnamed_fields;
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237 int i;
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238
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239 n_fields = REAL_SIZE(self);
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240 n_visible_fields = VISIBLE_SIZE(self);
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241 n_unnamed_fields = UNNAMED_FIELDS(self);
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242 tup = PyTuple_New(n_visible_fields);
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243 if (!tup) {
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244 return NULL;
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245 }
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246
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247 dict = PyDict_New();
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248 if (!dict) {
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249 Py_DECREF(tup);
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250 return NULL;
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251 }
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252
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253 for (i = 0; i < n_visible_fields; i++) {
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254 Py_INCREF(self->ob_item[i]);
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255 PyTuple_SET_ITEM(tup, i, self->ob_item[i]);
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256 }
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257
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258 for (; i < n_fields; i++) {
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259 char *n = Py_TYPE(self)->tp_members[i-n_unnamed_fields].name;
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260 PyDict_SetItemString(dict, n,
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261 self->ob_item[i]);
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262 }
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263
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264 result = Py_BuildValue("(O(OO))", Py_TYPE(self), tup, dict);
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265
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266 Py_DECREF(tup);
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267 Py_DECREF(dict);
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268
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269 return result;
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270 }
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271
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272 static PyMethodDef structseq_methods[] = {
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273 {"__reduce__", (PyCFunction)structseq_reduce, METH_NOARGS, NULL},
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274 {NULL, NULL}
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275 };
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276
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277 static PyTypeObject _struct_sequence_template = {
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278 PyVarObject_HEAD_INIT(&PyType_Type, 0)
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279 NULL, /* tp_name */
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280 sizeof(PyStructSequence) - sizeof(PyObject *), /* tp_basicsize */
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281 sizeof(PyObject *), /* tp_itemsize */
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282 (destructor)structseq_dealloc, /* tp_dealloc */
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283 0, /* tp_print */
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284 0, /* tp_getattr */
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285 0, /* tp_setattr */
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286 0, /* tp_reserved */
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287 (reprfunc)structseq_repr, /* tp_repr */
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288 0, /* tp_as_number */
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289 0, /* tp_as_sequence */
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290 0, /* tp_as_mapping */
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291 0, /* tp_hash */
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292 0, /* tp_call */
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293 0, /* tp_str */
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294 0, /* tp_getattro */
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295 0, /* tp_setattro */
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296 0, /* tp_as_buffer */
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297 Py_TPFLAGS_DEFAULT, /* tp_flags */
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298 NULL, /* tp_doc */
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299 0, /* tp_traverse */
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300 0, /* tp_clear */
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301 0, /* tp_richcompare */
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302 0, /* tp_weaklistoffset */
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303 0, /* tp_iter */
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304 0, /* tp_iternext */
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305 structseq_methods, /* tp_methods */
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306 NULL, /* tp_members */
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307 0, /* tp_getset */
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308 0, /* tp_base */
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309 0, /* tp_dict */
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310 0, /* tp_descr_get */
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311 0, /* tp_descr_set */
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312 0, /* tp_dictoffset */
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313 0, /* tp_init */
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314 0, /* tp_alloc */
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315 structseq_new, /* tp_new */
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316 };
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317
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318 void
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319 PyStructSequence_InitType(PyTypeObject *type, PyStructSequence_Desc *desc)
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320 {
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321 PyObject *dict;
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322 PyMemberDef* members;
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323 int n_members, n_unnamed_members, i, k;
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324
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325 #ifdef Py_TRACE_REFS
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326 /* if the type object was chained, unchain it first
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327 before overwriting its storage */
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328 if (type->ob_base.ob_base._ob_next) {
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329 _Py_ForgetReference((PyObject*)type);
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330 }
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331 #endif
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332
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333 n_unnamed_members = 0;
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334 for (i = 0; desc->fields[i].name != NULL; ++i)
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335 if (desc->fields[i].name == PyStructSequence_UnnamedField)
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336 n_unnamed_members++;
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337 n_members = i;
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338
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339 memcpy(type, &_struct_sequence_template, sizeof(PyTypeObject));
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340 type->tp_base = &PyTuple_Type;
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341 type->tp_name = desc->name;
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342 type->tp_doc = desc->doc;
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343
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344 members = PyMem_NEW(PyMemberDef, n_members-n_unnamed_members+1);
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345 if (members == NULL)
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346 return;
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347
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348 for (i = k = 0; i < n_members; ++i) {
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349 if (desc->fields[i].name == PyStructSequence_UnnamedField)
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350 continue;
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351 members[k].name = desc->fields[i].name;
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352 members[k].type = T_OBJECT;
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353 members[k].offset = offsetof(PyStructSequence, ob_item)
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354 + i * sizeof(PyObject*);
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355 members[k].flags = READONLY;
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356 members[k].doc = desc->fields[i].doc;
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357 k++;
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358 }
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359 members[k].name = NULL;
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360
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361 type->tp_members = members;
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362
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363 if (PyType_Ready(type) < 0)
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364 return;
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365 Py_INCREF(type);
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366
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367 dict = type->tp_dict;
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368 #define SET_DICT_FROM_INT(key, value) \
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369 do { \
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370 PyObject *v = PyLong_FromLong((long) value); \
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371 if (v != NULL) { \
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372 PyDict_SetItemString(dict, key, v); \
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373 Py_DECREF(v); \
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374 } \
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375 } while (0)
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376
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377 SET_DICT_FROM_INT(visible_length_key, desc->n_in_sequence);
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378 SET_DICT_FROM_INT(real_length_key, n_members);
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379 SET_DICT_FROM_INT(unnamed_fields_key, n_unnamed_members);
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380 }
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381
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382 PyTypeObject*
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383 PyStructSequence_NewType(PyStructSequence_Desc *desc)
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384 {
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385 PyTypeObject *result = (PyTypeObject*)PyType_GenericAlloc(&PyType_Type, 0);
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386 PyStructSequence_InitType(result, desc);
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387 return result;
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388 }