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

[Benjamin Peterson]

Benjamin Peterson added the comment:


New changeset 11fa3c7cd1b151e302d4eee0369cafbaf151c8fb by Benjamin Peterson (Michael Selik) in branch 'master':
bpo-29957: change LBYL key lookup to dict.setdefault (#938)
https://github.com/python/cpython/commit/11fa3c7cd1b151e302d4eee0369cafbaf151c8fb


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<http://bugs.python.org/issue29957>
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