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| � � � n d d j | � d } d � k r�| | � � d � � 7} n | S( sa Copy formatargspec from python 3.7 standard library.
Python 3 has deprecated formatargspec and requested that Signature
be used instead, however this requires a full reimplementation
of formatargspec() in terms of creating Parameter objects and such.
Instead of introducing all the object-creation overhead and having
to reinvent from scratch, just copy their compatibility routine.
Utimately we would need to rewrite our "decorator" routine completely
which is not really worth it right now, until all Python 2.x support
is dropped.
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As tests still need to run on py2.6 we can't use multiple-with yet.
Function is removed in py3k but also emits deprecation warning in 2.7
so just roll it here for everyone.
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c s/ d � f � � f d � � Y} | d d i � S( s� Create a base class with a metaclass.
Drops the middle class upon creation.
Source: http://lucumr.pocoo.org/2013/5/21/porting-to-python-3-redux/
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