Raymond Hettinger <raymond.hettin...@gmail.com> added the comment: Option 2 seems perfectly reasonable here as a way of preventing bugs (working, correct code wouldn't be using the existing default of None).
Option 1 is problematic because of the variance from Mutable Mapping, because breaking symmetry with get(), and because the change in behavior is implicit. ---------- nosy: +rhettinger _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue33385> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
