[issue29957] unnecessary LBYL for key contained in defaultdict, lib2to3/btm_matcher

[Raymond Hettinger]

Raymond Hettinger added the comment:

Rather than removing the defaultdict, I think a cleaner fix is to just remove the unnecessary LBYL.   That leaves the code a little more compact, faster, and nice looking.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29957>
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