mirror of
https://github.com/sqlalchemy/sqlalchemy.git
synced 2026-05-22 00:22:01 -04:00
Mike Bayer
21099479da
Fixed bug where using ``copy.copy()`` or ``copy.deepcopy()`` on :class:`.MutableList` would cause the items within the list to be duplicated, due to an inconsistency in how Python pickle and copy both make use of ``__getstate__()`` and ``__setstate__()`` regarding lists. In order to resolve, a ``__reduce_ex__`` method had to be added to :class:`.MutableList`. In order to maintain backwards compatibility with existing pickles based on ``__getstate__()``, the ``__setstate__()`` method remains as well; the test suite asserts that pickles made against the old version of the class can still be deserialized by the pickle module. Also modified sqlalchemy.testing.util.picklers to return picklers all the way through pickle.HIGHEST_PROTOCOL. Fixes: #4603 Change-Id: I7f78b9cfb89d59a706248536c553dc5e1d987b88