Switch PYTHONPATH for each virtualenv

This is a method to switch the environment variable PYTHONPATH for each virtualenv when the Python environment is managed using virtualenv.

Add the following two lines to virtualenv_home / your_env / bin / activate.

activate

export OLD_PYTHONPATH=$PYTHONPATH
export PYTHONPATH="/path/to/you/want"

Add the following two lines to virtualenv_home / your_env / bin / postdeactivate.

postdeactivate

export PYTHONPATH=$OLD_PYTHONPATH
unset OLD_PYTHONPATH