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Speed-up building enums by value, e.g. http.HTTPStatus(200) (#11318) 

bpo-35585: Speed up enum by-value lookup
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Andrew Svetlov 2018-12-26 20:45:33 +02:00 committed by Ethan Furman
parent 3a81076bbf
commit 34ae04f74d
2 changed files with 5 additions and 2 deletions
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4
Lib/enum.py
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@ -563,8 +563,10 @@ class Enum(metaclass=EnumMeta):
# by-value search for a matching enum member # by-value search for a matching enum member
# see if it's in the reverse mapping (for hashable values) # see if it's in the reverse mapping (for hashable values)
try: try:
if value in cls._value2member_map_:
return cls._value2member_map_[value] return cls._value2member_map_[value]
except KeyError:
# Not found, no need to do long O(n) search
pass
except TypeError: except TypeError:
# not there, now do long search -- O(n) behavior # not there, now do long search -- O(n) behavior
for member in cls._member_map_.values(): for member in cls._member_map_.values():

1
Misc/NEWS.d/next/Library/2018-12-26-02-28-00.bpo-35585.Lkzd3Z.rst Normal file
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@ -0,0 +1 @@
Speed-up building enums by value, e.g. http.HTTPStatus(200).