Woah. This is definitely a cool idea to have all the python commands for fast.ai in one place. Would definitely like to contribute.
Just a few things. PEP8 is a coding style for python. There are quite a few things which are included in pep8 but are not required by python, nonetheless it is a good habit to use pep8 coding style. Most editors have pep8 extensions which can point you out if there is any problems with the code indentation or style.
For starters I would definitely look at any python basic tutorials, mainly simple string indexing, understanding basic structures like list, tuples, dict. Once this is done, I would look at numpy tutorial. After that matplotlib library for plotting. After this, only pytorch would remain which one can pickup while fiddling with the course.
The best link I know is http://cs231n.github.io/python-numpy-tutorial/. It more or less provides a very nice tutorial for most things that you would require for starters. While it is not a cheat sheet, it indeed contains everything that is essential for python beginners.
Cheers