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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"_colorize.can_colorize safety in test_argparse","articleBody":"# Bug report\n\n### Bug description:\n\nIn order to ensure its tests are meaningful even if color is disabled, the `TestColorized` test object in `test_argparse` modifies `_colorize.can_colorize` during setup, but does not subsequently restore it to the original value. As a consequence, the rest of the test session is polluted with colors/color codes even if `NO_COLOR=1`, or when in a dumb terminal or pipe. By comparison, we can look at the output of a similar setup in `test_regrtest` that uses `mock.patch` to only affect the state in that one test.\n\nGiven:\n```\nexport NO_COLOR=1\n```\n\nExpected:\n```\n./python -m test test_regrtest -m TestColorized\n```\n\n![Image](https://github.com/user-attachments/assets/1bcff1dc-5cd0-4a72-9469-f2bb2ef37fdd)\n\nPolluted visuals:\n```\n./python -m test test_argparse test_regrtest -m TestColorized\n```\n\n![Image](https://github.com/user-attachments/assets/687ad835-5f7d-4f67-8c35-a0cf8ad49c1b)\n\nPolluted text:\n```\n./python -m test test_argparse test_regrtest -m TestColorized \u003e OUTPUT.txt\nless OUTPUT.txt\n```\n\n![Image](https://github.com/user-attachments/assets/12345038-34ea-40c9-8dcb-357ffcc32921)\n\n### CPython versions tested on:\n\nCPython main branch, 3.14\n\n### Operating systems tested on:\n\nLinux\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-135238\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/tpburns","@type":"Person","name":"tpburns"},"datePublished":"2025-06-07T16:50:06.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/135237/cpython/issues/135237"}