pip

$pip freeze > requirements.txt = export all app packages to a file

$pip install -r requirements.txt = install all your dependencies

$pip install --upgrade -r requirements.txt = upgrade all packages version to latest (previously you'll have to edit requirements.txt and change '==' to '>=')

$pip show PackageName = show details of the installed package

$pip list = list all installed packages

$pip uninstall PackageName -y = uninstall PackageName and don't ask for confirmation