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Showing content from https://mail.python.org/pipermail/python-dev/2008-March/077805.html below:

[Python-Dev] Not backporting PEP 3115 (metaclass __prepare__)

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We can't backport the __prepare__ syntax without requiring metaclass
definition on the 'class' line.  Because the __metaclass__ definition
can be at the end of the class in 2.6 we can't find it until after we
execute the class and that is too late to use a custom dictionary.

I wish I had thought of that yesterday,

-Jack

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