Speed-up building enums by value, e.g. http.HTTPStatus(200) (#11318) · python/cpython@34ae04f (original) (raw)

Original file line number	Diff line number	Diff line change
@@ -563,8 +563,10 @@ def __new__(cls, value):
563	563	# by-value search for a matching enum member
564	564	# see if it's in the reverse mapping (for hashable values)
565	565	try:
566		-if value in cls._value2member_map_:
567		-return cls._value2member_map_[value]
	566	+return cls._value2member_map_[value]
	567	+except KeyError:
	568	+# Not found, no need to do long O(n) search
	569	+pass
568	570	except TypeError:
569	571	# not there, now do long search -- O(n) behavior
570	572	for member in cls._member_map_.values():