If you only have time to study one module, make it itertools-- and consider installing more-itertools (which is not in the standard libraries) if you think you can use its functionality. Some of the ...

Python Version 2.5 and later . The functools module provides tools for adapting or extending functions and other callable objects, without completely rewriting them. 3.1.1 Decorators . The primary ...

You easily can see this using Python's itertools module, a part of the standard library that has functions named permutations and combinations. Each takes both an iterable data structure and the ...