Mark Dickinson <dicki...@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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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue2267>
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