python virtualenv notes

gistfile1.txt

### python-virtualenv-notes ###

Notes from virtualenv documentation on pypi http://pypi.python.org/pypi/virtualenv

o Install
    o instructions for installing
        http://www.virtualenv.org/en/latest/#installation
    o in case you haven't already install pip
        $ sudo apt-get install python-pip
            OR
        $ sudo easy_install pip
    o install virtualenv via pip
        $ pip install virtualenv

o Running
    o create a virtualenv by running the virtualenv command 
        $ virtualenv [path-to-virtualenv-directory]
    o virtualenv adds a python interpreter to the 'bin' subidirectory
      this interpreter is configured to prepend the virtualenv directory to the PYTHONPATH
        $ ./ve1/bin/python -c "import sys; print('\n'.join(sys.path))" 
            /vagrant/ve1/local/lib/python2.7/site-packages/distribute-0.6.19-py2.7.egg
            /vagrant/ve1/local/lib/python2.7/site-packages/pip-1.0.2-py2.7.egg
            /vagrant/ve1/lib/python2.7/site-packages/distribute-0.6.19-py2.7.egg
            ...
            /usr/lib/python2.7
    o use the *activate* and *deactivate* scripts to enable interpreter from virtualenv
        $ source tornado_ve/bin/activate

            # confirm interpreter from virtualenv is being used
            (tornado_ve)vagrant@precise64:~$ which python
            /home/vagrant/tornado_ve/bin/python

            # pip installs into virtualenv, not system path
            (tornado_ve)vagrant@precise64:~$ pip install tornado
            ...

            (tornado_ve)vagrant@precise64:~$ pip freeze
            argparse==1.2.1
            tornado==2.4.1
            wsgiref==0.1.2

            # deactivate the virtualenv
            (tornado_ve)vagrant@precise64:~$ deactivate