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| author |   Andrew Svetlov <andrew.svetlov@gmail.com> | 2018-12-26 20:45:33 +0200 |
|---|---|---|
| committer |   Ethan Furman <ethan@stoneleaf.us> | 2018-12-26 10:45:33 -0800 |
| commit | 34ae04f74dcf4ac97d07c3e82eaf8f619d80cedb (patch) | |
| tree | d56bc8cc27a87025e8fb480eb47249534a136511 /Lib/enum.py | |
| parent | bpo-35579: Fix typo in in asyncio-task documentation (GH-11321) (diff) | |
| download | cpython-34ae04f74dcf4ac97d07c3e82eaf8f619d80cedb.tar.gz cpython-34ae04f74dcf4ac97d07c3e82eaf8f619d80cedb.tar.bz2 cpython-34ae04f74dcf4ac97d07c3e82eaf8f619d80cedb.zip | |
Speed-up building enums by value, e.g. http.HTTPStatus(200) (#11318)
bpo-35585: Speed up enum by-value lookup
Diffstat (limited to 'Lib/enum.py')
| -rw-r--r-- | Lib/enum.py | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/Lib/enum.py b/Lib/enum.py index fec1aed9b25..f7452f0cc0a 100644 --- a/Lib/enum.py +++ b/Lib/enum.py @@ -563,8 +563,10 @@ class Enum(metaclass=EnumMeta): # by-value search for a matching enum member # see if it's in the reverse mapping (for hashable values) 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: # not there, now do long search -- O(n) behavior for member in cls._member_map_.values(): |