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i Z i Z i Z d d � Z d d � Z d d � Z d S)z�Helper to provide extensibility for pickle.
This is only useful to add pickle support for extension types defined in
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| f Sd S)N� � __flags__zcan't pickle %s objects� __slots__zNa class that defines __slots__ without defining __getstate__ cannot be pickled)�AssertionError� __class__�__mro__�hasattrr � _HEAPTYPEr r �__name__� __getstate__�AttributeError�getattr�__dict__r )�self�protor r �args�getstate�dictr r r
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__newobj__W s r0 c C s | j | | | � S)zUsed by pickle protocol 4, instead of __newobj__ to allow classes with
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Wn Yn X| S) a� 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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__slotnames__Nr r) � __weakref__�__z_%s%s)r) r4 ) r) �getr# r" �
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r? c C s� t | � } d | k o# d k n s4 t d � � | | f } t j | � | k rn t j | � | k rn d S| t k r� t d | t | f � � | t k r� t d | t | f � � | t | <| t | <d S)zRegister an extension code.r i���zcode out of rangeNz)key %s is already registered with code %sz$code %s is already in use for key %s)�int�
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c C sq | | f } t j | � | k s6 t j | � | k rL t d | | f � � t | =t | =| t k rm t | =d S)z0Unregister an extension code. For testing only.z%key %s is not registered with code %sN)rB r6 rC rA �_extension_cache)rD r> rE rF r r r
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