Maric Michaud wrote: > Le Jeudi 01 Juin 2006 13:34, Peter Otten a écrit : >> A python-coded function has a __get__ attribute, a C-function doesn't. >> Therefore C1.f performs just the normal attribute lookup while C2.f also >> triggers the f.__get__(C2(), C2) call via the descriptor protocol which >> happens to return a bound method.
> I don't think it's about c-coded versus python-coded stuff, C1.f is a > type, C2.f is a method. You are right, int is a type not a function, but presence (and implementation, of course) of __get__ is still the distinguishing factor: >>> class Int(int): ... class __metaclass__(type): ... def __get__(*args): print "XXX", args ... >>> class C: ... int = Int ... >>> C().int XXX (<class '__main__.Int'>, <__main__.C instance at 0x402948cc>, <class __main__.C at 0x40281f2c>) Also: >>> from math import sin >>> sin <built-in function sin> >>> def son(x): pass ... >>> class C: ... sin = sin ... son = son ... >>> C().sin(0) 0.0 >>> C().son(0) Traceback (most recent call last): File "<stdin>", line 1, in ? TypeError: son() takes exactly 1 argument (2 given) Peter -- http://mail.python.org/mailman/listinfo/python-list
