Eric V. Smith added the comment: Just a guess, but it's because this code was written at a time when subclassing was the preferred way to extend code. Now we know better :), but it's not possible to change history, unfortunately. Lots of code depends on the current behavior.
If you find a way to make a factory function work, while preserving backward comparability, then we can re-open this issue and consider the enhancement request then. ---------- nosy: +eric.smith resolution: -> rejected stage: -> resolved status: open -> closed versions: -Python 2.7, Python 3.3, Python 3.4, Python 3.5, Python 3.6 _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue29947> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
