In only a one-two hour slot, I would introduce easy_install and the PyPI repository: even if they are not in the standard lib, they enable you to install many other external modules, and it is the first place where to look when you can't find in the standard lib.
Apart from that, I would introduce numpy, re, doctest/unittest, and maybe pickle.
![[愿得一人]](https://www.e-learn.cn/qa/data/avatar/000/00/00/small_000000012.jpg)