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GH-98766: Modest speed-up from ChainMap.__iter__ (GH-98946)

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Raymond Hettinger 2022-10-31 23:44:40 -05:00 committed by GitHub
parent 5cf317ade1
commit f5afb7f233
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1 changed files with 2 additions and 2 deletions
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Lib/collections/__init__.py
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@ -1011,8 +1011,8 @@ class ChainMap(_collections_abc.MutableMapping):
def __iter__(self): def __iter__(self):
d = {} d = {}
for mapping in reversed(self.maps): for mapping in map(dict.fromkeys, reversed(self.maps)):
d.update(dict.fromkeys(mapping)) # reuses stored hash values if possible d |= mapping # reuses stored hash values if possible
return iter(d) return iter(d)
def __contains__(self, key): def __contains__(self, key):