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By default, != returns the opposite of ==, unless the latter returns

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NotImplemented.

(Is this worth backporting to 2.6?  It seems so useful...!)
This commit is contained in:
Guido van Rossum 2007-03-27 22:37:34 +00:00
parent a4335b1e6b
commit e27dc72308
3 changed files with 25 additions and 1 deletions
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17
Objects/typeobject.c
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@ -2314,7 +2314,22 @@ object_richcompare(PyObject *self, PyObject *other, int op)
break;
case Py_NE:
res = (self != other) ? Py_True : Py_False;
/* By default, != returns the opposite of ==,
unless the latter returns NotImplemented. */
res = PyObject_RichCompare(self, other, Py_EQ);
if (res != NULL && res != Py_NotImplemented) {
int ok = PyObject_IsTrue(res);
Py_DECREF(res);
if (ok < 0)
res = NULL;
else {
if (ok)
res = Py_False;
else
res = Py_True;
Py_INCREF(res);
}
}
break;
default: