Mercurial > cpython-lru_cache-weakref
diff Objects/typeobject.c @ 41311:834da52eb2a4
By default, != returns the opposite of ==, unless the latter returns
NotImplemented.
(Is this worth backporting to 2.6? It seems so useful...!)
| author | Guido van Rossum <guido@python.org> |
|---|---|
| date | Tue, 27 Mar 2007 22:37:34 +0000 |
| parents | f2f0b41f270d |
| children | 519e72d630d2 |
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--- a/Objects/typeobject.c Tue Mar 27 22:34:34 2007 +0000 +++ b/Objects/typeobject.c Tue Mar 27 22:37:34 2007 +0000 @@ -2314,7 +2314,22 @@ 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: