Milko Krachounov <pyt...@milko.3mhz.net> added the comment: My suggestion is not only unreadable, but wrong. It's even less accurate than hasattr(x, '__call__'), as it doesn't look in all the classes in the MRO. Using isinstance(x, collections.Callable) should probably be the correct replacement for 2to3 and situation where checking this is really needed, as it does look for __call__ in the whole MRO.
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