gh-106498: Revert incorrect colorsys.rgb_to_hls change #106627
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pythongh-86618 assumed a-b-c = a-(b+c) = a-d where d = b+d. For floats 2.0, 1.0, and 0.9999999999999999, this assumption is false. The net change of 1.1102230246251565e-16 to 0.0 results in division by 0. Revert the replacement. Add test.
terryjreedy
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needs backport to 3.11
methane
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Jul 11, 2023
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Thanks @terryjreedy for the PR 🌮🎉.. I'm working now to backport this PR to: 3.11, 3.12. |
miss-islington
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…H-106627) pythongh-86618 assumed a-b-c = a-(b+c) = a-d where d = b+d. For floats 2.0, 1.0, and 0.9999999999999999, this assumption is false. The net change of 1.1102230246251565e-16 to 0.0 results in division by 0. Revert the replacement. Add test. (cherry picked from commit a2d54d4) Co-authored-by: Terry Jan Reedy <[email protected]>
miss-islington
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…H-106627) pythongh-86618 assumed a-b-c = a-(b+c) = a-d where d = b+d. For floats 2.0, 1.0, and 0.9999999999999999, this assumption is false. The net change of 1.1102230246251565e-16 to 0.0 results in division by 0. Revert the replacement. Add test. (cherry picked from commit a2d54d4) Co-authored-by: Terry Jan Reedy <[email protected]>
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GH-106632 is a backport of this pull request to the 3.12 branch. |
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GH-106633 is a backport of this pull request to the 3.11 branch. |
terryjreedy
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) (#106632) gh-106498: Revert incorrect colorsys.rgb_to_hls change (GH-106627) gh-86618 assumed a-b-c = a-(b+c) = a-d where d = b+d. For floats 2.0, 1.0, and 0.9999999999999999, this assumption is false. The net change of 1.1102230246251565e-16 to 0.0 results in division by 0. Revert the replacement. Add test. (cherry picked from commit a2d54d4) Co-authored-by: Terry Jan Reedy <[email protected]>
terryjreedy
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Jul 11, 2023
) (#106633) gh-106498: Revert incorrect colorsys.rgb_to_hls change (GH-106627) gh-86618 assumed a-b-c = a-(b+c) = a-d where d = b+d. For floats 2.0, 1.0, and 0.9999999999999999, this assumption is false. The net change of 1.1102230246251565e-16 to 0.0 results in division by 0. Revert the replacement. Add test. (cherry picked from commit a2d54d4) Co-authored-by: Terry Jan Reedy <[email protected]>
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gh-86618 assumed a-b-c = a-(b+c) = a-d where d = b+d. For floats 2.0, 1.0, and 0.9999999999999999, this assumption is false. The net change of 1.1102230246251565e-16 to 0.0 results in division by 0. Revert the replacement. Add test.