Python Itertools Cheat Sheet (DRAFT) by aasimkhan

The itertools module is a collection of tools intended to be fast and use memory effici­ently when handling iterators (like lists or dictio­nar­ies).

Example:

import itertools

From the Python 3 docume­ntation
The module standa­rdizes a core set of fast, memory efficient tools that are useful by themselves or in combin­ation. Together, they form an “iterator algebra” making it possible to construct specia­lized tools succinctly and effici­ently in pure Python.