[Python-Dev] Advice on numbers.py implementation of binary mixins. (original) (raw)
Nick Coghlan ncoghlan at gmail.com
Sat Jun 14 03:23:19 CEST 2008
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Raymond Hettinger wrote:
The question for the group is what to put on the XXX line.
1. Limit it to type(self). This approach claims the least knowledge about other types and uses their rand methods(). 2. Use type(self), int, and long. This approach says that we know that ints and longs can be reasonably converted to an int; however, it means that any int/long subtype cannot use rand to override the mixin's and. 3. Emulate the PEP as closely as possible and accomodate subclassing without changing behaviors. This approach is a bit complex: knowntypes = (set(type(self).mro) & set(type(other.mro)) - set(type(Integral.mro)) | set([int, long])) if isinstance(other, tuple(knowntypes)):
As 2, but skip int/long subclasses:
if type(other) in (int, long) or isinstance(other, type(self)):
Cheers, Nick.
-- Nick Coghlan | ncoghlan at gmail.com | Brisbane, Australia
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