I close the issue. The initial issue has been fixed (PyRun_String is now exported again in the Python DLL).

Eryk Sun:
> Wouldn't it be better to add a function to _testcapi that checks GetProcAddress(PyWin_DLLhModule, name)?

I have no idea.

Steve Dower:
> Should we add a regression test to avoid this happening in the future?

As I explained, I'm not sure where to put such test, I'm not sure what should be tested. If someone wants to work on that, I suggest to open a separated issue.