[issue37101] Filterer.filter can be rewritten using built-ins just as efficient much more readable

[Dale Visser]

Dale Visser <dale.visser at live.com> added the comment:

Adding the patch file associated with GitHub pull request #13683, as well as the performance test I just reported.

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Added file: https://bugs.python.org/file48383/pr13683.diff

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<https://bugs.python.org/issue37101>
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