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Author belopolsky
Recipients Claudiu.Popa, belopolsky, christian.heimes, ethan.furman, ionelmc, llllllllll
Date 2015-04-17.23:00:44
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From <>:

>>>>>>> GvR <<<<<<<<<<
I think you've found an unintended and undocumented backdoor. I admit I don't understand how this works in CPython. Overloaded operators like __add__ or __call__ should be methods in the class, and we don't look for them in the instance. But somehow defining them with @property works (I guess because @property is in the class).

What's different for __call__ is that callable() exists. And this is probably why I exorcised it Python 3.0 -- but apparently it's back. :-(

In the end callable() doesn't always produce a correct answer; but maybe we can make it work in this case by first testing the class and then the instance? Something like (untested):

def callable(x):
    return hasattr(x.__class__, '__call__') and hasattr(x, '__call__')

>>>>>>> GvR <<<<<<<<<<
Date User Action Args
2015-04-17 23:00:44belopolskysetrecipients: + belopolsky, christian.heimes, ionelmc, Claudiu.Popa, ethan.furman, llllllllll
2015-04-17 23:00:44belopolskysetmessageid: <>
2015-04-17 23:00:44belopolskylinkissue23990 messages
2015-04-17 23:00:44belopolskycreate