[issue2267] datetime.datetime operator methods are not subclass-friendly
report at bugs.python.org
Thu Jun 17 22:52:19 CEST 2010
Mark Dickinson <dickinsm at gmail.com> added the comment:
I had understood that the rule was that alternate constructors should be classmethods, for consistency with __new__. (Well, except that __new__ is actually a staticmethod, of course... )
E.g., after "class MyDecimal(Decimal): pass", MyDecimal('2.3') produces a MyDecimal instance, and by analogy MyDecimal.from_float(2.3) should also produce a MyDecimal instance. It's exactly the same type of function as the class constructor.
I don't think it would do any harm to get clarification from python-dev on the underlying reasons.
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