| 1 | n/a | /* Cell object implementation */ |
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| 2 | n/a | |
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| 3 | n/a | #include "Python.h" |
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| 4 | n/a | |
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| 5 | n/a | PyObject * |
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| 6 | n/a | PyCell_New(PyObject *obj) |
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| 7 | n/a | { |
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| 8 | n/a | PyCellObject *op; |
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| 9 | n/a | |
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| 10 | n/a | op = (PyCellObject *)PyObject_GC_New(PyCellObject, &PyCell_Type); |
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| 11 | n/a | if (op == NULL) |
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| 12 | n/a | return NULL; |
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| 13 | n/a | op->ob_ref = obj; |
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| 14 | n/a | Py_XINCREF(obj); |
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| 15 | n/a | |
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| 16 | n/a | _PyObject_GC_TRACK(op); |
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| 17 | n/a | return (PyObject *)op; |
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| 18 | n/a | } |
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| 19 | n/a | |
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| 20 | n/a | PyObject * |
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| 21 | n/a | PyCell_Get(PyObject *op) |
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| 22 | n/a | { |
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| 23 | n/a | if (!PyCell_Check(op)) { |
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| 24 | n/a | PyErr_BadInternalCall(); |
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| 25 | n/a | return NULL; |
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| 26 | n/a | } |
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| 27 | n/a | Py_XINCREF(((PyCellObject*)op)->ob_ref); |
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| 28 | n/a | return PyCell_GET(op); |
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| 29 | n/a | } |
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| 30 | n/a | |
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| 31 | n/a | int |
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| 32 | n/a | PyCell_Set(PyObject *op, PyObject *obj) |
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| 33 | n/a | { |
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| 34 | n/a | PyObject* oldobj; |
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| 35 | n/a | if (!PyCell_Check(op)) { |
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| 36 | n/a | PyErr_BadInternalCall(); |
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| 37 | n/a | return -1; |
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| 38 | n/a | } |
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| 39 | n/a | oldobj = PyCell_GET(op); |
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| 40 | n/a | Py_XINCREF(obj); |
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| 41 | n/a | PyCell_SET(op, obj); |
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| 42 | n/a | Py_XDECREF(oldobj); |
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| 43 | n/a | return 0; |
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| 44 | n/a | } |
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| 45 | n/a | |
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| 46 | n/a | static void |
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| 47 | n/a | cell_dealloc(PyCellObject *op) |
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| 48 | n/a | { |
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| 49 | n/a | _PyObject_GC_UNTRACK(op); |
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| 50 | n/a | Py_XDECREF(op->ob_ref); |
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| 51 | n/a | PyObject_GC_Del(op); |
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| 52 | n/a | } |
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| 53 | n/a | |
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| 54 | n/a | #define TEST_COND(cond) ((cond) ? Py_True : Py_False) |
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| 55 | n/a | |
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| 56 | n/a | static PyObject * |
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| 57 | n/a | cell_richcompare(PyObject *a, PyObject *b, int op) |
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| 58 | n/a | { |
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| 59 | n/a | int result; |
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| 60 | n/a | PyObject *v; |
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| 61 | n/a | |
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| 62 | n/a | /* neither argument should be NULL, unless something's gone wrong */ |
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| 63 | n/a | assert(a != NULL && b != NULL); |
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| 64 | n/a | |
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| 65 | n/a | /* both arguments should be instances of PyCellObject */ |
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| 66 | n/a | if (!PyCell_Check(a) || !PyCell_Check(b)) { |
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| 67 | n/a | v = Py_NotImplemented; |
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| 68 | n/a | Py_INCREF(v); |
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| 69 | n/a | return v; |
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| 70 | n/a | } |
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| 71 | n/a | |
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| 72 | n/a | /* compare cells by contents; empty cells come before anything else */ |
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| 73 | n/a | a = ((PyCellObject *)a)->ob_ref; |
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| 74 | n/a | b = ((PyCellObject *)b)->ob_ref; |
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| 75 | n/a | if (a != NULL && b != NULL) |
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| 76 | n/a | return PyObject_RichCompare(a, b, op); |
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| 77 | n/a | |
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| 78 | n/a | result = (b == NULL) - (a == NULL); |
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| 79 | n/a | switch (op) { |
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| 80 | n/a | case Py_EQ: |
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| 81 | n/a | v = TEST_COND(result == 0); |
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| 82 | n/a | break; |
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| 83 | n/a | case Py_NE: |
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| 84 | n/a | v = TEST_COND(result != 0); |
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| 85 | n/a | break; |
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| 86 | n/a | case Py_LE: |
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| 87 | n/a | v = TEST_COND(result <= 0); |
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| 88 | n/a | break; |
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| 89 | n/a | case Py_GE: |
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| 90 | n/a | v = TEST_COND(result >= 0); |
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| 91 | n/a | break; |
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| 92 | n/a | case Py_LT: |
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| 93 | n/a | v = TEST_COND(result < 0); |
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| 94 | n/a | break; |
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| 95 | n/a | case Py_GT: |
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| 96 | n/a | v = TEST_COND(result > 0); |
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| 97 | n/a | break; |
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| 98 | n/a | default: |
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| 99 | n/a | PyErr_BadArgument(); |
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| 100 | n/a | return NULL; |
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| 101 | n/a | } |
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| 102 | n/a | Py_INCREF(v); |
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| 103 | n/a | return v; |
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| 104 | n/a | } |
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| 105 | n/a | |
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| 106 | n/a | static PyObject * |
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| 107 | n/a | cell_repr(PyCellObject *op) |
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| 108 | n/a | { |
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| 109 | n/a | if (op->ob_ref == NULL) |
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| 110 | n/a | return PyUnicode_FromFormat("<cell at %p: empty>", op); |
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| 111 | n/a | |
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| 112 | n/a | return PyUnicode_FromFormat("<cell at %p: %.80s object at %p>", |
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| 113 | n/a | op, op->ob_ref->ob_type->tp_name, |
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| 114 | n/a | op->ob_ref); |
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| 115 | n/a | } |
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| 116 | n/a | |
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| 117 | n/a | static int |
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| 118 | n/a | cell_traverse(PyCellObject *op, visitproc visit, void *arg) |
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| 119 | n/a | { |
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| 120 | n/a | Py_VISIT(op->ob_ref); |
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| 121 | n/a | return 0; |
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| 122 | n/a | } |
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| 123 | n/a | |
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| 124 | n/a | static int |
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| 125 | n/a | cell_clear(PyCellObject *op) |
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| 126 | n/a | { |
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| 127 | n/a | Py_CLEAR(op->ob_ref); |
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| 128 | n/a | return 0; |
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| 129 | n/a | } |
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| 130 | n/a | |
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| 131 | n/a | static PyObject * |
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| 132 | n/a | cell_get_contents(PyCellObject *op, void *closure) |
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| 133 | n/a | { |
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| 134 | n/a | if (op->ob_ref == NULL) |
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| 135 | n/a | { |
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| 136 | n/a | PyErr_SetString(PyExc_ValueError, "Cell is empty"); |
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| 137 | n/a | return NULL; |
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| 138 | n/a | } |
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| 139 | n/a | Py_INCREF(op->ob_ref); |
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| 140 | n/a | return op->ob_ref; |
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| 141 | n/a | } |
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| 142 | n/a | |
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| 143 | n/a | static PyGetSetDef cell_getsetlist[] = { |
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| 144 | n/a | {"cell_contents", (getter)cell_get_contents, NULL}, |
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| 145 | n/a | {NULL} /* sentinel */ |
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| 146 | n/a | }; |
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| 147 | n/a | |
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| 148 | n/a | PyTypeObject PyCell_Type = { |
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| 149 | n/a | PyVarObject_HEAD_INIT(&PyType_Type, 0) |
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| 150 | n/a | "cell", |
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| 151 | n/a | sizeof(PyCellObject), |
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| 152 | n/a | 0, |
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| 153 | n/a | (destructor)cell_dealloc, /* tp_dealloc */ |
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| 154 | n/a | 0, /* tp_print */ |
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| 155 | n/a | 0, /* tp_getattr */ |
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| 156 | n/a | 0, /* tp_setattr */ |
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| 157 | n/a | 0, /* tp_reserved */ |
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| 158 | n/a | (reprfunc)cell_repr, /* tp_repr */ |
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| 159 | n/a | 0, /* tp_as_number */ |
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| 160 | n/a | 0, /* tp_as_sequence */ |
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| 161 | n/a | 0, /* tp_as_mapping */ |
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| 162 | n/a | 0, /* tp_hash */ |
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| 163 | n/a | 0, /* tp_call */ |
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| 164 | n/a | 0, /* tp_str */ |
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| 165 | n/a | PyObject_GenericGetAttr, /* tp_getattro */ |
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| 166 | n/a | 0, /* tp_setattro */ |
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| 167 | n/a | 0, /* tp_as_buffer */ |
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| 168 | n/a | Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */ |
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| 169 | n/a | 0, /* tp_doc */ |
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| 170 | n/a | (traverseproc)cell_traverse, /* tp_traverse */ |
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| 171 | n/a | (inquiry)cell_clear, /* tp_clear */ |
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| 172 | n/a | cell_richcompare, /* tp_richcompare */ |
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| 173 | n/a | 0, /* tp_weaklistoffset */ |
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| 174 | n/a | 0, /* tp_iter */ |
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| 175 | n/a | 0, /* tp_iternext */ |
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| 176 | n/a | 0, /* tp_methods */ |
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| 177 | n/a | 0, /* tp_members */ |
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| 178 | n/a | cell_getsetlist, /* tp_getset */ |
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| 179 | n/a | }; |
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