Activate virtualenv in blender

gistfile1.py

def activate_virtualenv(name):
    """Activate given virtualenv.

    Virtualenv home folder is given by environment variable ``WORKON_HOME`` or
    ``~/Envs`.
    """
    if 'WORKON_HOME' in os.environ:
        home = os.environ['WORKON_HOME']
    else:
        home = os.path.expanduser(os.path.join('~', 'Envs'))
    filepath = os.path.join(home, name, 'Scripts', 'activate_this.py')
    with open(filepath, 'r') as f:
        exec(f.read(), dict(__file__=filepath))