Install python-numpy in the Virtualenv environment -

i install python-numpy in virtualenv environment. system ubuntu 12.04, , python 2.7.5. first installed virtualenv

$ sudo apt-get install python-virtualenv 

and set environment by

$ mkdir myproject $ cd myproject $ virtualenv venv new python executable in venv/bin/python installing distribute............done. 

activated by

$ . venv/bin/activate 

installed python-numpy in environment by

$ sudo apt-get install python-numpy 

however, tried import numpy in python in environment after steps above. python told me "no modules named numpy". whereas, numpy imported in python globally. tried remove , install many times not work. beginner of both python , linux.

apt-get still install modules globally, when you're in new virtualenv.

you should either use pip install numpy within virtual environment (easiest way), or else compile , install numpy source using setup.py file in root of source directory (slightly harder way, see here).

i'd thoroughly recommend take @ virtualenvwrapper, makes managing virtual environments friendlier.

edit:

you should not using sudo, either create virtual environment or install things within - it's directory in home folder, don't need elevated permissions make changes it. if use sudo, pip make changes global site packages, not virtual environment, hence why weren't able install numpy locally.

another thing consider by default, new virtualenvs inherit global site-packages - i.e. if python can't find module locally within virtualenv, python in global site packages *. in case, since you'd installed numpy globally (using apt-get), when try pip install numpy in virtual environment, pip sees numpy in python path , doesn't install locally.

you could:

1. pass --no-site-packages option when create virtualenv. prevents new virtualenv inheriting global site packages, must installed locally.

2. force pip install/upgrade numpy locally, e.g. using pip install -u --force numpy

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* as of v1.7, default behaviour of virtualenv not include global site-packages directory. can override passing --system-site-packages flag when creating new virtual environment.