diff options
| -rw-r--r-- | Lib/enum.py | 6 | ||||
| -rw-r--r-- | Misc/NEWS.d/next/Library/2018-12-26-02-28-00.bpo-35585.Lkzd3Z.rst | 1 |
2 files changed, 5 insertions, 2 deletions
diff --git a/Lib/enum.py b/Lib/enum.py index fec1aed9b2..f7452f0cc0 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(): diff --git a/Misc/NEWS.d/next/Library/2018-12-26-02-28-00.bpo-35585.Lkzd3Z.rst b/Misc/NEWS.d/next/Library/2018-12-26-02-28-00.bpo-35585.Lkzd3Z.rst new file mode 100644 index 0000000000..247a4ae680 --- /dev/null +++ b/Misc/NEWS.d/next/Library/2018-12-26-02-28-00.bpo-35585.Lkzd3Z.rst @@ -0,0 +1 @@ +Speed-up building enums by value, e.g. http.HTTPStatus(200). |