I wrote about this in the FAQ (https://github.com/qw3rtman/p#faqs), but I'll reiterate the main use case below.

p is for the average Python developer who just needs to work with a different version of Python. Suppose one wants to start using the latest development release of Python; they just run `p latest` and p will take care of the rest.

`p` is a wrapper that handles and manages everything for you, simplifying the process for those who aren't familiar with tox or virtualenvwrapper. :)