Cannot find vcvarsall.bat when running a Python script

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It seems that Python is looking explicitly for Visual Studio 2008. I encountered this problem where it couldn’t find vcvarsall.bat even though it was on the path.

It turns out that Visual Studio 2010 creates the following environment variable:

SET VS100COMNTOOLS=C:\Program Files\Microsoft Visual Studio 10.0\Common7\Tools\

The fix is to create a variable called VS90COMNTOOLS and have that point to your Visual Studio 2010 common tools folder, e.g.

SET VS90COMNTOOLS=C:\Program Files\Microsoft Visual Studio 10.0\Common7\Tools\

That fixed it for me and I can now build packages using the Visual Studio 2010 compiler.

You can also set the VS90 environment variable to point to the VS100 environment variable using the command below:

SET VS90COMNTOOLS=%VS100COMNTOOLS%

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