[docs] [issue37145] collections.abc.MappingView mixins rely on undocumented _mapping

Geoffrey Sneddon <geoffers+pythonbugs@gmail.com> added the comment: Then I guess what I consider a bug is "__init__ is undocumented". ---------- _______________________________________ Python tracker <report@bugs.python.org> <https://bugs.python.org/issue37145> _______________________________________