CODEWITHSUNDEEP
c++cpython-3.xcython
Giswok
Giswok

Reputation: 569

Python distutils refuses to recognise installed C++ compilers, `Unable to find vcvarsall.bat` under Python 3.5

I'm tearing my hair out trying to compile c though Python's distutils. Specifically I'm trying to get started with Cython following this guide: http://docs.cython.org/src/quickstart/build.html, using a setup.py.

I'm running Python 3.5.0 under Anaconda 2.4.0 (64-bit), Windows 7.

I get the Unable to find vcvarsall.bat error referred to here: Cannot find vcvarsall.bat when running a Python script and in various other questions.

None of the proposed solutions work for me. So far I have tried:

The only thing I can think of is installing MinGW which I've seen suggested in some places, but that CythonExtensionsOnWindows link specifically recommended against it.

Any other suggestions would be very welcome! In particular, since I clearly have all the versions of VS I could possibly need, is there a way to force Python to recognise them, other than setting environment variables VS100COMNTOOLS or similar?

Interestingly conda does seem to recognise the installed compilers, as a separate pip install attempt that failed with this same error, worked with conda.

Upvotes: 4

Views: 1528

Answers (1)

Giswok
Giswok

Reputation: 569

As it turns out, Python 3.5 needs Visual Studio 2015. Advice elsewhere on fixing this for other Python versions is outdated.

Get Visual Studio 2015 Community here: https://www.visualstudio.com/en-us/downloads/visual-studio-2015-downloads-vs.aspx, this worked for me with no further steps needed.

Many thanks to Ionel, apparently the only place on the web to find this information! http://blog.ionelmc.ro/2014/12/21/compiling-python-extensions-on-windows/

Upvotes: 2

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