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The new implementation is a little more robust, and hopefully gets
around the issue caused by modern SQLAlchemy releases ('method' object
is not iterable).
BEFORE: We were using Alex Martelli's excellent implementation from StackOverflow. Unfortunately, this falls down when attempting to create a ``HashableDict`` with keys that aren't sortable. We had addressed this once before, but in a not-very-clean fashion, and the switch to the new implementation lost it. AFTER: We have a more robust implementation. Rather than attempting to sort the dictionary after the fact, we extend ``collections.OrderedDict`` to ensure that it iterates in the same order; we were only sorting to ensure our comparisons were consistent, and ``OrderedDict`` gives us that without breaking in the case of non-comparable types as keys in the same ``dict``. Further, we are once again turnng the ``dict`` values into ``tuple``s where required (for instance, because ``list`` values will break ``hash``). HOWEVER, in contrast to our earlier ``tuple``-izing implementation, we do *NOT* exclude non-iterable values from our hash and/or equality comparisons.
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SQLAlchemy went 1.0 a while back, and being tied to pre-1.0 makes this harder to use. I've got projects that depend on 1.0 or better that also need this lib, so the transitive dependency conflict is problematic.
As a side-effect of the version bump on SQLAlchemy, the
HashableDictimplementation was throwing an error, so I also had to revisit it. Happily, I think the new implementation is more robust.I also bumped the version number, so it would be easy to cut a new release for PyPI.