The single most valuable thing I've learned about python

... pydoc and help()

pydoc is a executable that's installed with python, pass it the name of a module to see a generated man page for that module (e.g. pydoc string). You can also pass it a file path, but for a local python file, in order for it to work you have to use the full path or precede the filename with './', (e.g. pydoc ./whatever.py).

help() runs within a python shell. Run it without arguments to get general help with python; pass a string containing the name of a module to get documentation for that module, or pass any it any existent module or object reference and it will generate docs for that object.

This will save you a lot of lookups to the manual. For instance, to remind yourself of the methods of dict objects, you can just run help() on any dict object, or just an empty such object (e.g. help({})).