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�ZdS(sjClass advice.

This module was adapted from 'protocols.advice', part of the
Python
Enterprise Application Kit (PEAK).  Please notify the PEAK authors
(pje@telecommunity.com and tsarna@sarna.org) if bugs are found or
Zope-specific changes are required, so that the PEAK version of this module
can be kept in sync.

PEAK is a Python application framework that interoperates with (but does
not require) Zope 3 and Twisted.  It provides tools for manipulating UML
models, object-relational persistence, aspect-oriented programming, and
more.
Visit the PEAK home page at http://peak.telecommunity.com for more
information.
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    wishes to have executed when the containing class is created.  The
    callback will be given one argument: the newly created containing
class.
    The return value of the callback will be used in place of the class, so
    the callback should return the input if it does not wish to replace the
    class.

    The optional 'depth' argument to this function determines the
number of
    frames between this function and the targeted class suite. 
'depth'
    defaults to 2, since this skips this function's frame and one
calling
    function frame.  If you use this function from a function called
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need
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    This function works by installing a special class factory function in
    place of the '__metaclass__' of the containing class. 
Therefore, only
    callbacks *after* the last '__metaclass__' assignment in the
containing
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