"ImportError: DLL load failed" on fresh Windows 10 installation about kiwi HOT 6 CLOSED

Sadly I cannot embed Microsoft Visual C++ redistributable 2015 (or 2017 which is binary compatible) in the wheels. The best I can do is add a detailed explanation of the issue and of how to fix it in the documentation.

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I will close when the documentation will have been updated.

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I'm not a regular Windows user, still now I feel dumb for not looking for a Windows library dependency analyzer, that would have saved me a ton of trying and searching: http://www.dependencywalker.com/

Updating the documentation is as good as it gets I think. Nothing can be done to show "you are likely missing Microsoft Visual C++ redistributable 2015/2017" on import errors, right? Apart from maybe making a wrapper module which imports the real deal and throws that message ...

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I don't fancy adding a Python module to handle that kind of error report. However matplotlib could add such a safety around the import of kiwisolver. Something along the following lines:

try:
    import kiwisolver as kiwi
except ImportError as ex:
    if sys.platform == 'win32' and 'DLL' in ex.msg:
        msg = ('You may be missing Microsoft Visual C++ redistributable '
               'matching your Python version. Consult Kiwisolver '
               'documentation for more details.'
        raise ImportError(msg) from ex
    else:
        raise

I do not have access to a windows machine on which to test anytime soon @jonascj . Could you test and open a PR against matplotlib ?

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Sure could, I actually just suggested something similar here:

matplotlib/matplotlib#14315

And that should be added the first place kiwisolver is imported, I think that is in _check_versions() in lib/matplotlib/__init__.py, at least that is what throws the error.

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Your suggested code works, thanks. I submitted a PR containing it: matplotlib/matplotlib#14316

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