ImportError: No module named numpy

Question

I'm trying to run a program that requires Numpy to be installed. I thought it was, because if I try sudo apt-get install python-numpy it tells me that

sudo apt-get install python-numpy

Reading package lists... Done
Building dependency tree       
Reading state information... Done
python-numpy is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

But then when I go to install the program I'm trying to (within that programs directory, where setup.py is located) I get:

python setup.py install
Traceback (most recent call last):
   File "setup.py", line 20, in <module>
    from weblogolib import __version__
  File "/home/chris/Documents/IS/Bioinformatics-Software/weblogo-3.3/weblogolib/__init__.py", line 108, in <module>
     from numpy import array, asarray, float64, ones, zeros, int32,all,any, shape
ImportError: No module named numpy

When I look in the Python-2.7.3/Lib/site-packages directory the only thing that's in there is a README file. Shouldn't there be stuff from Numpy in there (and other install Python modules)?

I am running Ubuntu 12.04 with Python 2.7

Using dpkg -l python-numpy I get:

Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name           Version        Description
+++-==============-==============-============================================
ii  python-numpy   1:1.6.1-6ubunt Numerical Python adds a fast array facility

Answer 1

You do not mention where you are running the commands. For the commands, I guess you are using Ubuntu 12.10.

In Ubuntu 12.10 the default is Python3 (check it with python --version). So that, when you ran python setup ..., you are running it with the default python available. For what it is worth, weblog 3.3 requires Python 2.5, 2.6 or 2.7.

Also, you can check where python-numpy was installed (check it with dpkg -L python-numpy).

My shot out of the blue would be:

$ python2.7 setup.py install

If you do not have installed python2.7, you should install it (likely, the shell is going to suggest it).