The pip command is a tool for installing and managing Python packages, such as those found in the Python Package Index.
Install a package from PyPI
$ pip install SomePackage
Show which files were installed
$ pip show --files SomePackage
List which packages are outdated
$ pip list --outdated
Upgrade a package
$ pip install --upgrade SomePackage
Uninstall a package
$ pip uninstall SomePackage
You can find further information about pip here.