[issue19610] Give clear error messages for invalid types used for setup.py params (e.g. tuple for classifiers)

[Henk-Jaap Wagenaar]

Henk-Jaap Wagenaar <wagenaarhenkjaap at gmail.com> added the comment:

This is still present, and also silently affects Python 2.7 as evidenced here: https://github.com/pypa/setuptools/issues/1163

I am happy to adapt Berker Peksags patch to a PR, if he is?

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nosy: +Henk-Jaap Wagenaar
versions: +Python 3.6, Python 3.7 -Python 3.5

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