Greg Ewing wrote: > For that purpose, hasattr(obj, '__call__') is sufficient, > I think. And if it's not, the API you're trying to > implement is ill-conceived in the first place, just like > testing for sequenceness is not a well-defined operation.
I should add that for ipython's purposes, it seems I could just implement def callable(o): return hasattr(o,'__call__') and it would be OK. I hadn't realized that Python reports true to the hasattr() call form for lambdas, simple plain functions, functions in extension modules, extension types, and most things I could quickly think of and check from code I have. I wasn't aware of this fact, I thought it would only be true for instances of classes which explicitly implemented a __call__ method, and that callable() did some other magic. Having understood this, I then don't really care whether callable() goes away or not, it's a one-liner as an interactive ipython convenience. Sorry for not checking more carefully, I trusted a misconception I had. Cheers, f _______________________________________________ Python-3000 mailing list Python-3000@python.org http://mail.python.org/mailman/listinfo/python-3000 Unsubscribe: http://mail.python.org/mailman/options/python-3000/archive%40mail-archive.com
