René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"`libregrtest` should always set `random.seed`","articleBody":"# Feature or enhancement\n\nWhile working on https://github.com/python/cpython/issues/110160 I've noticed that it is rather hard to reproduce random test failures. So, I want to propose a new feature / fix for that.\n\nFirst of all, there's existing prior work of @vstinner who added `--randseed` flag.\nRight now it is used together with `-r` to randomize test order and seeding random.\n\nI propose to:\n- Split `--randseed` into two options: test order randomization and `random.seed` usage\n- Let's keep `-r` as-is\n- Let's add `--no-use-randseed` flag to disable setting `random.seed`, let's always seed random by default\n- Always print information about current random seed to be able to reuse it in the next runs\n\nExample:\n\n```\n» ./python.exe -m test test_regrtest\nUsing random seed 65906482\n0:00:00 load avg: 1.55 Run 1 test sequentially\n0:00:00 load avg: 1.55 [1/1] test_regrtest\n\n== Tests result: SUCCESS ==\n\n1 test OK.\n\nTotal duration: 12.7 sec\nTotal tests: run=102 skipped=2\nTotal test files: run=1/1\nResult: SUCCESS\n```\n\nBasically, this is how https://github.com/pytest-dev/pytest-randomly works.\n\nI have a PR ready.\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-110172\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/sobolevn","@type":"Person","name":"sobolevn"},"datePublished":"2023-10-01T07:25:41.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/110171/cpython/issues/110171"}