These are general guide lines and not hard and fast rules.
The recommended method of installing via pip is:
python[3] -m pip install --user <somepackage>
Installing python modules system wide is normally done when a larger group of people need a particular module.
This is the recommended method of installation. I will refer you to pip
's --user
option install any python module under your user account. These will be installed under $HOME/.local
.