[issue38643] Assertion failures when calling PyNumber_ToBase() with an invalid base

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

Sorry Zackery, I did not know about this issue so I wrote different PR to fix this problem. And only after writing it I have found this issue.

There are several differences between your PR and PR 18863.

* SystemError is raised instead of ValueError because this is incorrect use of the C API.
* The error message mentions also base 10.
* The test is written mostly in Python.

For these reasons I prefer my PR.

Please let me know if you need a review for other PRs.

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<https://bugs.python.org/issue38643>
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