Installing NumPy and SciPy on 64-bit Windows (with Pip)


I found out that it's impossible to install NumPy/SciPy via installers on Windows 64-bit, that's only possible on 32-bit. Because I need more memory than a 32-bit installation gives me, I need the 64-bit version of everything.

I tried to install everything via Pip and most things worked. But when I came to SciPy, it complained about missing a Fortran compiler. So I installed Fortran via MinGW/MSYS. But you can't install SciPy right away after that, you need to reinstall NumPy. So I tried that, but now it doesn't work anymore via Pip nor via easy_install. Both give these errors:

  • There are a lot of errors about LNK2019 and LNK1120,.
  • I get a lot of errors in the range of C: C2065,C2054,C2085,C2143`, etc. They belong together I believe.
  • There is no Fortran linker found, but I have no idea how to install that, can't find anything on it.
  • And many more errors which are already out of the visible part of my cmd-windows...
  • The fatal error is about LNK1120:

    build\\numpy\linalg\lapack_lite.pyd : fatal error LNK1120: 7 unresolved externals error: Setup script exited with error: Command "C:\Users\me\AppData\Local\Programs\Common\Microsoft\Visual C++ for Python\9.0\VC\Bin\amd64\link.exe /DLL /nologo /INCREMENTAL:NO /LIBPATH:C:\BLAS /LIBPATH:C:\Python27\libs /LIBPATH:C:\Python27\PCbuild\amd64 /LIBPATH:build\ lapack.lib blas.lib /EXPORT:initlapack_lite build\\Release\numpy\linalg\lapack_litemodule.obj /OUT:build\\numpy\linalg\lapack_lite.pyd /IMPLIB:build\\Release\numpy\linalg\lapack_lite.lib /MANIFESTFILE:build\\Release\numpy\linalg\lapack_lite.pyd.manifest" failed with exit status 1120

What is the correct way to install the 64-bit versions NumPy and SciPy on a 64-bit Windows machine? Did I miss anything? Do I need to specify something somewhere? There is no information for Windows on these problems that I can find, only for Linux or Mac OS X, but they don't help me as I can't use their commands.

This question is tagged with python numpy scipy windows64

~ Asked on 2014-10-30 15:39:47

The Best Answer is


EDIT: The Numpy project now provides pre-compiled packages in the wheel format (package format enabling compiled code as binary in packages), so the installation is now as easy as with other packages.

Numpy (as also some other packages like Scipy, Pandas etc.) includes lot's of C-, Cython, and Fortran code that needs to be compiled properly, before you can use it. This is, btw, also the reason why these Python-packages provide such fast Linear Algebra.

To get precompiled packages for Windows, have a look at Gohlke's Unofficial Windows Binaries or use a distribution like Winpython (just works) or Anaconda (more complex) which provide an entire preconfigured environment with lots of packages from the scientific python stack.

~ Answered on 2014-10-31 08:30:01


You can install scipy and numpy using their wheels.

First install wheel package if it's already not there...

pip install wheel

Just select the package you want from

Example: if you're running python3.5 32 bit on Windows choose scipy-0.18.1-cp35-cp35m-win_amd64.whl then it will automatically download.

Then go to the command line and change the directory to the downloads folder and install the above wheel using pip.


cd C:\Users\[user]\Downloads
pip install scipy-0.18.1-cp35-cp35m-win_amd64.whl

~ Answered on 2016-10-21 21:35:10

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