A one-page reference for Python’s containers, every line explained: lists, tuples, dicts, sets, the collections module, and how to choose between them.
Almost every Python bug that is not a typo comes from picking the wrong container, or from forgetting that two names can point at the same one. Lists mutate, tuples do not, sets forget order and duplicates, dicts answer questions by key, and the collections module quietly replaces the ten-line patterns everybody writes by hand. This cheatsheet puts them side by side with the operations that matter and a plain explanation of what every one of them does, so the choice is obvious before you write the loop. Keep it open while you work, or save the image and pin it nearby.
Hope this helps.
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