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d � Z d � Z d � Z i Z i Z i Z d � Z d � Z d � Z d S( s� Helper to provide extensibility for pickle/cPickle.
This is only useful to add pickle support for extension types defined in
C, not for instances of user-defined classes.
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add_extensiont remove_extensiont clear_extension_cachec C sf t | � t k r! t d � � n t | d � s? t d � � n | t | <| d k rb t | � n d S( Ns- copy_reg is not intended for use with classest __call__s$ reduction functions must be callable( t typet
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s� Return a list of slot names for a given class.
This needs to find slots defined by the class and its bases, so we
can't simply return the __slots__ attribute. We must walk down
the Method Resolution Order and concatenate the __slots__ of each
class found there. (This assumes classes don't modify their
__slots__ attribute to misrepresent their slots after the class is
defined.)
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