[issue33237] Improve AttributeError message for partially initialized module

[Serhiy Storchaka]

Change by Serhiy Storchaka <storchaka+cpython at gmail.com>:


----------
keywords: +patch
pull_requests: +6104
stage:  -> patch review

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33237>
_______________________________________