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idioms for abstract base classes

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Robin Becker wrote:> what's the best way to spell an abstract base class so that> 0) base is B and A inherits from B>> 1) doing B() causes an exception>> 2) most of the initialisation code is common in BIt's not often worth trying to enforce abstractness, but the followingmight work for you:    >>> class B:    ...   def __init__(self, *args, **kw):    ...      if self.__class__ is B: raise "B is abstract"    ...      self.args = args    ...     >>> B()    Traceback (innermost last):      File "<stdin>", line 1, in ?      File "<stdin>", line 3, in __init__    B is abstract    >>> class A(B):    ...    pass    ...     >>> a = A(1,2,3)    >>> a.args    (1, 2, 3)    >>> -Steve-- Steve Purcell, PythangelistGet testing athttp://pyunit.sourceforge.net/Any opinions expressed herein are my own and not necessarily those of Yahoo

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