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

[Serhiy Storchaka]

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

In simplejson classifiers is a result of filter(). This is a list in Python 2 and an iterator in Python 3. It can be uploaded using Python 2.

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<https://bugs.python.org/issue19610>
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