* Install
Install in "development mode" so any change of the program is effective.

Note: For system wide (global) installation log in as root or use sudo for
example. For local (user) installation the local path must be in the
=PYTHONPATH= environment variable.
Typically =$HOME/.local/lib/pythonX.Y/site-packages=

Use either:
#+BEGIN_SRC shell
pip install -e .
pip install --user -e .
python -m pip install -e .
easy_install --prefix=$HOME/.local -e .
pip install --install-option="--prefix-$HOME/.local" -e .
#+END_SRC

* Uninstall
pip uninstall materials