Bruno Desthuilliers wrote: > > > Another way is to use the 'types' module: > > True - and that's somewhat cleaner since it doesn't expose the internals > of the descriptor protocol. OTHO, it can lead to strange results with > callables not implementing the descriptor protocol:
<snip> Actually, the result is not "strange" at all if you understand what's going. The reason you got an exception is because your __call__() method only takes a single argument (the implicit self argument, which is the instance of MyCallable). However, if you define it with two arguments it works just fine: >>> class MyCallable(object): ... def __call__(self, inst): ... print self, inst ... >>> class Foo(object): ... pass ... >>> fun = MyCallable() >>> f = Foo() >>> f.fun = types.MethodType(fun, f, Foo) >>> f.fun() <__main__.MyCallable object at 0x648d0> <__main__.Foo object at 0x64810> >>> ~ Daniel -- http://mail.python.org/mailman/listinfo/python-list
