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Python Sorting Gotchas: Strings vs Numbers, Mixed Types, Unicode, Stability, Multi-Key and NaN

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Self-Hosting & Infra beginner 5 min read $0.01 Updated 2026-10-20

Tested outputs on Python 3.10: sorted of numeric strings, key=int, case-insensitive key, accents sorting after z, stable sort, descending-by-one-key tuples, TypeError messages for str and None, sort() returning None, and NaN breaking order.

Sort numbers stored as strings, mixed None values, case-insensitive text and multi-key rows correctly. See what Python does with lexicographic order, TypeError, accented letters, stability and NaN.

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