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Python 3 Syntax Cheat Sheet

A concise, thorough one-page Python 3 syntax reference. Opens with a CodeSignal Industry Coding Assessment (ICA) kit — the class shape that survives all four levels, top-N sorting with tie-breaks, timestamp/TTL variants and the delegation refactor, append-only history with bisect point-in-time lookup and rollback, a dict/collections toolkit, and the corner cases the spec language actually asks for. Then the full general reference: variables and type hints, printing and input, strings and f-strings, operators and None handling, if/match, loops, functions, Enum, dataclasses, lists, tuples, sets, dicts (including many values per key), comprehensions, files and JSON, errors and asyncio, and the common imports with what each is for.