Install Numpy on Mac OS X Lion 10.7

Question

I need to install Numpy on my Mac OS X Lion 10.7. I googled a little bit, it seems like there are a lot of stuff needs to be installed. And some says I need install Xcode be

Answer 1

Lion comes with numpy installed. It should already be there:

$ python -c 'import numpy, numpy.version; print numpy, numpy.version.version'
<module 'numpy' from '/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/numpy/__init__.py'> 1.5.1

Answer 2

Generally, unless you have a good reason you might want to avoid trying to have to build numpy/scipy et al. yourself.

For Mac's there are two nice everything-included packages for numerical python. Enthough distribution (paid, http://www.enthought.com/) and Sagemath (free, http://www.sagemath.org/). I'm happily using Sagemath on 10.7 - it has numpy, scipy etc.

Answer 3

A very easy route is to install Anaconda from Continuum, or Enthought's Canopy. These are python distributions that include numpy, as well as other useful scientific computing libraries

Answer 4

For anyone that hits this from google, here is where I figured out how to build numpy on Mac OS.

http://www.scipy.org/Installing_SciPy/Mac_OS_X

On lion, it amounts to setting some environment variables (after Xcode is installed):

export CC=gcc-4.2
export CXX=g++-4.2
export FFLAGS=-ff2c

Then pip install numpy works just fine.

Answer 5

I have used a few software packages that require a fresh install of NumPy, that won't work with the built in NumPy or even with the built-in Python. The easiest way to install NumPy on the mac is to download any of these packages. This will work for most OS versions.

• Python 2.7
• Python 2.6
• Python 2.5

Still the other answers are valid, though this is a more general answer.

This is the SourceForge page of the project.

Answer 6

If you do install Xcode you can get the latest and greatest open source libraries and packages. Consider using the excellent Mac Ports (http://www.macports.org) project. It is a package manager that will download source packages and their dependencies and build all the libraries and tools for you.

Installing Numpy becomes a one line command once Xcode and mac ports is installed:

sudo port install py27-numpy