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                 @   s   G d d dZ dS )c               @   s<   e Zd ZdZdZdd ZeddddZedd	d
dZ	dS )CloudInitPickleMixina  Scaffolding for versioning of pickles.

    This class implements ``__getstate__`` and ``__setstate__`` to provide
    lightweight versioning of the pickles that are generated for classes which
    use it.  Versioning is done at the class level.

    The current version of a class's pickle should be set in the class variable
    ``_ci_pkl_version``, as an int.  If not overriden, it will default to 0.

    On unpickle, the object's state will be restored and then
    ``self._unpickle`` is called with the version of the stored pickle as the
    only argument: this is where classes should implement any deserialization
    fixes they require.  (If the stored pickle has no version, 0 is passed.)
        c             C   s   | j j }t| j|d< |S )aL  Persist instance state, adding a pickle version attribute.

        This adds a ``_ci_pkl_version`` attribute to ``self.__dict__`` and
        returns that for serialisation.  The attribute is stripped out in
        ``__setstate__`` on unpickle.

        The value of ``_ci_pkl_version`` is ``type(self)._ci_pkl_version``.
        _ci_pkl_version)__dict__copytyper   )selfstate r	   !/usr/lib/python3.6/persistence.py__getstate__   s    	
z!CloudInitPickleMixin.__getstate__N)r   returnc             C   s&   |j dd}| jj| | j| dS )aE  Restore instance state and handle missing attributes on upgrade.

        This will be called when an instance of this class is unpickled; the
        previous instance's ``__dict__`` is passed as ``state``.  This method
        removes the pickle version from the stored state, restores the
        remaining state into the current instance, and then calls
        ``self._unpickle`` with the version (or 0, if no version is found in
        the stored state).

        See https://docs.python.org/3/library/pickle.html#object.__setstate__
        for further background.
        r   r   N)popr   update	_unpickle)r   r   versionr	   r	   r
   __setstate__'   s    z!CloudInitPickleMixin.__setstate__)ci_pkl_versionr   c             C   s   dS )a>  Perform any deserialization fixes required.

        By default, this does nothing.  Classes using this mixin should
        override this method if they have fixes they need to apply.

        ``ci_pkl_version`` will be the version stored in the pickle for this
        object, or 0 if no version is present.
        Nr	   )r   r   r	   r	   r
   r   8   s    zCloudInitPickleMixin._unpickle)
__name__
__module____qualname____doc__r   r   dictr   intr   r	   r	   r	   r
   r      s
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   <module>   s    