[issue32932] better error message when __all__ contains non-str objects

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

I believe the original rationale for the `__path__` check was to restrict that branch to the case where we may need to import a not-yet-imported submodule in order to get the attribute set appropriately.

However, giving a better error message for __all__ in ordinary modules also seems like a good reason to follow that branch.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32932>
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