On Thu, Apr 4, 2013 at 1:50 PM, Tim Delaney <tim.delaney at aptare.com> wrote: > I fall into: > > 1. int(), float(), str() etc should return that exact class (and > operator.index() should return exactly an int). > > 2. It could sometimes be useful for __int__() and __index__() to return a > subclass of int. > > So, for the int constructor, I would have the following logic (assume > appropriate try/catch): > > def __new__(cls, obj): > i = obj.__int__() > > if type(i) is int: > return i > > return i._internal_value CPython can solve this in C using an unsafe cast, and the code that checks for allowable subclasses of int actually ensures such a cast will work. But it still feels wrong; __int__ should be expected to do the work. -- --Guido van Rossum (python.org/~guido)
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