Prevent the creation of universal wheel with Python 3 only package. about zest.releaser HOT 3 CLOSED

My feeling: such a check would be better added to setuptools/wheel itself.
See also a recent change (https://github.com/zestsoftware/zest.releaser/blob/master/CHANGES.rst#6172-2019-03-25) and also #315 . @mauritsvanrees might know more about this :-)

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The pointers from @reinout are helpful. We call python setup.py bdist_wheel to create a wheel. We have no influence on what kind of wheel is created.
I guess the wheel package could check the classifiers in setup.py to see if there are only Python 3 classifiers, and then complain.
Similarly, I can imagine a check in wheel to give an error when there are only Python 3 classifiers and you create a wheel with Python 2.7.

In the context of zest.releaser, it may be an idea to do some checks like this in an extension, like pyroma or check-manifest.

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Okay, thanks for the quick response. It might be a good idea to get an extension working.

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