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Issue 12647: Add __bool__() method to the None object.

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This commit is contained in:
Raymond Hettinger 2011-07-28 09:55:13 -07:00
parent a2250e61db
commit 66d2be8986
3 changed files with 48 additions and 5 deletions
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46
Objects/object.c
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@ -1255,7 +1255,7 @@ PyObject_Dir(PyObject *obj)
}
/*
None is as a non-NULL undefined value.
None is a non-NULL undefined value.
There is (and should be!) no way to create other objects of this type,
so there is exactly one (which is indestructible, by the way).
*/
@ -1277,6 +1277,48 @@ none_dealloc(PyObject* ignore)
Py_FatalError("deallocating None");
}
static int
none_bool(PyObject *v)
{
return 0;
}
static PyNumberMethods none_as_number = {
0, /* nb_add */
0, /* nb_subtract */
0, /* nb_multiply */
0, /* nb_remainder */
0, /* nb_divmod */
0, /* nb_power */
0, /* nb_negative */
0, /* nb_positive */
0, /* nb_absolute */
(inquiry)none_bool, /* nb_bool */
0, /* nb_invert */
0, /* nb_lshift */
0, /* nb_rshift */
0, /* nb_and */
0, /* nb_xor */
0, /* nb_or */
0, /* nb_int */
0, /* nb_reserved */
0, /* nb_float */
0, /* nb_inplace_add */
0, /* nb_inplace_subtract */
0, /* nb_inplace_multiply */
0, /* nb_inplace_remainder */
0, /* nb_inplace_power */
0, /* nb_inplace_lshift */
0, /* nb_inplace_rshift */
0, /* nb_inplace_and */
0, /* nb_inplace_xor */
0, /* nb_inplace_or */
0, /* nb_floor_divide */
0, /* nb_true_divide */
0, /* nb_inplace_floor_divide */
0, /* nb_inplace_true_divide */
0, /* nb_index */
};
static PyTypeObject PyNone_Type = {
PyVarObject_HEAD_INIT(&PyType_Type, 0)
@ -1289,7 +1331,7 @@ static PyTypeObject PyNone_Type = {
0, /*tp_setattr*/
0, /*tp_reserved*/
none_repr, /*tp_repr*/
0, /*tp_as_number*/
&none_as_number, /*tp_as_number*/
0, /*tp_as_sequence*/
0, /*tp_as_mapping*/
0, /*tp_hash */