[Python-3000] abc docs

[Mark Summerfield]

I may not be the first to mistakenly write

    class Foo(ABCMeta):

when I meant to write

    class Foo(metaclass=ABCMeta):

but I'm sure I won't be the last.

Sorry for the mistake...

Maybe attempting to register an ABCMeta subclass might lead to a more
informative warning though?

----------  Forwarded Message  ----------

Subject: Re: [Python-3000] abc docs
Date: 2007-09-05
From: Mark Summerfield <mark at qtrac.eu>
To: python-3000 at python.org

[snip]

BTW When I tried a variation of one of the ABC examples from the PEP I
got this:

    Python 3.0a1 (py3k, Sep  1 2007, 08:25:11)
    [GCC 4.1.2 20070626 (Red Hat 4.1.2-13)] on linux2
    Type "help", "copyright", "credits" or "license" for more information.
    >>> import abc
    >>> class MyABC(abc.ABCMeta): pass
    ...
    >>> MyABC.register(tuple)
    Traceback (most recent call last):
    File "<stdin>", line 1, in <module>
    RuntimeError: maximum recursion depth exceeded in __instancecheck__

[snip]

I hope that the first one is a bug rather than intended.

-- 
Mark Summerfield, Qtrac Ltd., www.qtrac.eu


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-- 
Mark Summerfield, Qtrac Ltd., www.qtrac.eu