New submission from Chris Lambacher: When an Enum is being created, the _value2member_map class property is defined to speed lookup of Enum values later on. If the value does not exist then it falls back to a linear search through the _member_map.values() looking for member.value == value. This differs from population of the _value2member_map dictionary since population happens like this: enum_class._value2member_map[value] = enum_member
This differs because "value" is the value of the property in the definition, not the _value property of enum_member. In most cases this does not matter, but for instances where a __new__ or __init__ is doing something funky with the values (like auto-numbering) then the _value2member_map dict won't have the right information. ---------- messages: 193379 nosy: lambacck priority: normal severity: normal status: open title: enum.Enum population of _value2member_map does not match fallback search type: behavior versions: Python 3.4 _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue18508> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
