Pip packet manager

When we want to install package we use pip

pip install request

Installing package with specific version

pip install request==2.9.0

Installing package when we don't know the exact version

pip install request==2.9.*

or

pip install request~=2.9.0

If request package released versions 2.9.0, 2.9.1, 2.9.2, those commands install the latest version that is 2.9.2.