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How does Timsort make Python's sort fast and stable?

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01

Understand the problem

Runs and merging.

sortingtimsort
02

Attempt it yourself

Sketch your approach before reading the solution — that's what interviews test.

Nudge consolestandby

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03

Study the solution

Timsort finds existing sorted runs, extends them, and merge-sorts the runs; it is stable and adaptive, hitting O(n) on nearly-sorted data and O(n log n) worst case.

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04

Run the code

PYStability enables multi-key sorting in passes
05

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