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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Add assertFloatsAreIdentical/assertComplexAreIdentical to unittest (or kwarg to assertEqual)?","articleBody":"# Feature or enhancement\r\n\r\n### Proposal:\r\n\r\nClones of assertFloatsAreIdentical() are scattered across the CPython tests:\r\nhttps://github.com/python/cpython/blob/d8f82432a36178a2376cc2d0984b02bb03f6d55f/Lib/test/test_complex.py#L74\r\nhttps://github.com/python/cpython/blob/d8f82432a36178a2376cc2d0984b02bb03f6d55f/Lib/test/test_cmath.py#L68\r\nhttps://github.com/python/cpython/blob/d8f82432a36178a2376cc2d0984b02bb03f6d55f/Lib/test/test_float.py#L1069\r\nhttps://github.com/python/cpython/blob/d8f82432a36178a2376cc2d0984b02bb03f6d55f/Lib/test/test_capi/test_getargs.py#L440\r\n\r\nMaybe it's worth to have a dedicated check?\r\n\r\nOr a special kwarg for the assertEqual method, to workaround ``NAN`` and ``-0.0`` values for floats/complexes.\r\n\r\nEdit:\r\n\r\nOr at least some support from Lib/test/support...  I was adding similar helper yet in another test file and that looks odd.\r\n\r\nNumpy has numpy.testing.assert_equal():\r\n```pycon\r\n\u003e\u003e\u003e np.testing.assert_equal([0.0], [+0.0])\r\n\u003e\u003e\u003e np.testing.assert_equal([0.0], [-0.0])\r\nTraceback (most recent call last):\r\n  ...\r\nAssertionError: \r\nItems are not equal:\r\nitem=0\r\n\r\n ACTUAL: 0.0\r\n DESIRED: -0.0\r\n\u003e\u003e\u003e np.testing.assert_equal([np.nan], [np.nan])\r\n\u003e\u003e\u003e np.testing.assert_equal([0.0], [np.nan])\r\nTraceback (most recent call last):\r\n  ...\r\nAssertionError: \r\nItems are not equal:\r\nitem=0\r\n\r\n ACTUAL: 0.0\r\n DESIRED: nan\r\n```\r\n\r\n### Has this already been discussed elsewhere?\r\n\r\nThis is a minor feature, which does not need previous discussion elsewhere\r\n\r\n### Links to previous discussion of this feature:\r\n\r\n_No response_\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-121071\n* gh-123840\n* gh-123841\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/skirpichev","@type":"Person","name":"skirpichev"},"datePublished":"2024-06-26T09:13:28.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/121039/cpython/issues/121039"}