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� � YZ d e f d � � YZ d e f d � � YZ e � d e f d � � YZ e � d e f d � � YZ e � d S( sq Strategies for creating new instances of Engine types.
These are semi-private implementation classes which provide the
underlying behavior for the "strategy" keyword argument available on
:func:`~sqlalchemy.engine.create_engine`. Current available options are
``plain``, ``threadlocal``, and ``mock``.
New strategies can be added via new ``EngineStrategy`` classes.
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Provides a ``create`` method that receives input arguments and
produces an instance of base.Engine or a subclass.
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