How to use lists in Python The difference between a dictionary and a list however, is that lists are sequential and use numbers for their indexes.

For some time now, Python developers have been able to “annotate” names with type information. With Python 3.5, type hints officially became part of the language (see PEP 484).

And that's the easy tier. Try a full dictionary—916132832 combinations (includes just upper, lower case and numbers). In these instances, you might want to try a dictionary attack.