eran eran - 1 year ago 181
Python Question

Installing SciPy and NumPy using pip

I'm trying to create required libraries in a package I'm distributing. It requires both the SciPy and NumPy libraries.
While developing, I installed both using

apt-get install scipy

which installed SciPy 0.9.0 and NumPy 1.5.1, and it worked fine.

I would like to do the same using
pip install
- in order to be able to specify dependencies in a of my own package.

The problem is, when I try:

pip install 'numpy==1.5.1'

it works fine.

But then

pip install 'scipy==0.9.0'

fails miserably, with

raise self.notfounderror(self.notfounderror.__doc__)


Blas ( libraries not found.

Directories to search for the libraries can be specified in the

numpy/distutils/site.cfg file (section [blas]) or by setting

the BLAS environment variable.

How do I get it to work?

Answer Source

I am assuming Linux experience in my answer; I found that there are three prerequisites to getting pip install scipy to proceed nicely.

Go here: Installing SciPY

Follow the instructions to download, build and export the env variable for BLAS and then LAPACK. Be careful to not just blindly cut'n'paste the shell commands - there will be a few lines you need to select depending on your architecture, etc., and you'll need to fix/add the correct directories that it incorrectly assumes as well.

The third thing you may need is to yum install numpy-f2py or the equivalent.

Oh, yes and lastly, you may need to yum install gcc-gfortran as the libraries above are Fortran source.

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