[issue40124] Clearer assertion error

[Chris Jerdonek]

Chris Jerdonek <chris.jerdonek at gmail.com> added the comment:

How about we review Phil's PR, which adds a message to the assertion. And then we can keep this issue open to discuss converting the assertion to an exception. I think Phil's PR is an improvement.

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nosy: +chris.jerdonek

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40124>
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