Installing numpy Lion with Python 2.7?

Question

I am working on a OS X 10.7 with Python 2.7 from python.org and XCode 4.2.

1. Following these instructions, I tried changing the CC, CXX, and FFLAGS variables and install with sudo pip install numpy. However, the installation still looks for gcc-4.2.
2. I tried installing gcc-4.2 through MacPorts but get that Error: gcc42 does not build on Snow Leopard or later.

3. When I install numpy from the precompiled binary on sourceforge, I get the following error:

   import numpy

   Traceback (most recent call last):

   File "", line 1, in

   File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/numpy/init.py", line 137, in

   import add_newdocs
   

   File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/numpy/add_newdocs.py", line 9, in

   from numpy.lib import add_newdoc
   

   File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/numpy/lib/init.py", line 4, in

   from type_check import *
   

   File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/numpy/lib/type_check.py", line 8, in

   import numpy.core.numeric as _nx
   

   File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/numpy/core/init.py", line 5, in

   import multiarray
   

   ImportError: dlopen(/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/numpy/core/multiarray.so, 2): no suitable image found. Did find: /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/numpy/core/multiarray.so: no matching architecture in universal wrapper

Any help?

Answer 1

If I recall correctly the precompiled binary on source forge is 32-bit. It took me ages to get Numpy, Scipy, and Matplotlib set up on my macbook, it's definitely much harder than it should be.

I believe that your best option is the Scipy superpack. Before using the superpack you need to update to Xcode 4.3.2

So I just installed python 2.7.2 from python.org, grabbed the superpack, and now have numpy working on my machine. After installing python 2.7.2, I did sudo pip uninstall numpy, which didn't remove enough. So I cd'd into /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/ and moved both the numpy directory and the numpy egg to "old" versions of themselves. Then I ran sh install_superpack.sh and answered no to the "are you installing from a repository cloned to this machine(pretty important lol, hit yes without thinking the first time).

However, now I'm able to do this:

$ python
Python 2.7.2 (v2.7.2:8527427914a2, Jun 11 2011, 15:22:34) 
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import numpy
>>> import scipy
>>> import matplotlib

With no problems :)

Answer 2

SuperPack worked for me (thanks, @Nolen) on OS X 10.8 (Mountain Lion) w/ XCode 4.5.1 installed.

Numpy worked for me using pip install numpy after step #1 below. But scipy would not install using pip. SuperPack fixed this.

The only thing I did differently was to use HomeBrew to install Python as step #1, rather than download it manually.

1. Install Python (separate from version that comes with OS X 10.8)

   • brew install python --framework --universal
   • pushd /System/Library/Frameworks/Python.framework/Versions
   • sudo rm Current
   • sudo ln -s /usr/local/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/Current
   • popd

2. Install SuperPack:

   • curl -o install_superpack.sh https://raw.github.com/fonnesbeck/ScipySuperpack/master/install_superpack.sh
   • sh install_superpack.sh
   • (type your admin password several times during the installation...)