Steve Dower <steve.do...@python.org> added the comment:

> I understand that LoadLibraryExW() must not be attempted if _Py_dll_path is 
> empty, or if Py_GetPrefix() is empty. Am I right?

More likely those should never be empty. Perhaps sys.prefix is optional, but 
the DLL path is the current executing module, and should always be set.

I suspect you're right, that 3.7 is also affected. But earlier versions would 
only _not_ fill the DLL path for static (non-shared) builds.

It looks like Py_SetPath in 3.7 started clearing it unnecessarily, so that may 
be the cause.

----------
stage: resolved -> needs patch

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue29778>
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