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Python random: Seeding for Reproducible Tests, shuffle Returning None, sample vs choices and Never for Secrets

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Self-Hosting & Infra beginner 4 min read $0.01 Updated 2026-10-20

Executed on Python 3.10: identical sequences after random.seed(42), shuffle returning None and mutating in place, sample without replacement raising ValueError when too large, choices with replacement, a private random.Random instance, and secrets helpers.

Make randomized code repeatable with a seed or a private Random instance, avoid the shuffle-returns-None bug, pick between sample and choices, and use secrets for anything security-related.

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