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

[Brett Cannon]

Brett Cannon <brett at python.org> added the comment:

This is only for `import *`, though, right? So I would argue you're already tossing import perf out the window if you're willing to pollute your namespace like that.

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