(from discussion at the 2015 Python Language Summit)

Current versions of Python make it relatively easy to install third-party packages such as requests.  New users may not realize this, though, and continue using libraries such as urllib/urllib2 because they're in the stdlib.

The Python tutorial doesn't seem to mention either virtualenv or pip. It should, describing how to create a virtualenv, install packages, and manage them in basic ways (removing, 'pip freeze', requirements.txt.)