gh-155966: Correct handling of math.tanpi poles - #155980
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As pointed out in the issue, the exceptional half-integer (0.5, 1.5, etc) inputs of tanpi were not handled properly. Now, these raise ValueError and this is tested by `test.test_math` through its list of test cases.
skirpichev
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Aug 18, 2026
…YOADY.rst Co-authored-by: Sergey B Kirpichev <skirpichev@gmail.com>
the test harness cannot verify the sign of infinity, it can only verify the exception; but it's good for it to be correct anyhow.
This reverts commit faa1799.
skirpichev
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Aug 18, 2026
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CC @picnixz |
mdickinson
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Aug 18, 2026
skirpichev
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Aug 18, 2026
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Mildly off-topic: in case anyone's interested, there's some fun reading here: https://grouper.ieee.org/groups/msc/ANSI_IEEE-Std-754-2019/background/tanpi.txt |
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Thanks for the changes! LGTM (FWTW) |
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@picnixz, lets merge this. |
picnixz
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math.tanpi poles
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I forgot that Mark relinquished his commit bit |
maurycy
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Sep 10, 2026
* main: (158 commits) pythongh-156924: Try reifying lazy imports in `ForwarRef.evaluate()` (python#156940) pythongh-156233: Fix typos and code snippet errors in the docs (python#156475) pythongh-156837: Refer to yield expressions in generator function definitions (pythonGH-156863) pythongh-155292: Skip updating unicodedata with mismatched interpreter (pythonGH-157066) pythongh-157170: Document the scope of global curses settings (pythonGH-157207) pythongh-155966: Correct handling of `math.tanpi` poles (python#155980) pythongh-157170: Restore use_env() after test_use_prescr_screen in test_curses (pythonGH-157171) pythongh-156910: fix deadlock in type_set_abstractmethods under free-threading (python#156948) pythongh-155648: Write the empty and placeholder IDLE tests (python#156260) pythongh-153569: centralize formatted-string state and source spans (python#156484) pythongh-157137: Mark the PEP 820 soft deprecations as 3.15, not `next` (python#157138) pythongh-152433: Use regular LoadLibrary in UWP for Windows system libs (pythonGH-156972) pythongh-121617: Fix Py_CLEAR() memcpy in C++: replace NULL with _Py_NULL (python#157188) pythongh-157135: Fix documentation errors in the `math.atan{2}pi` functions (python#157136) pythongh-121617: Fix Py_CLEAR() in C++: replace NULL with _Py_NULL (python#157067) pythongh-156774: Speed up pdb startup with asyncio guard (python#156775) pythongh-156109: Allow static, non-framework iOS builds (python#156110) pythongh-156780: Emscripten: add missing EM_JS_DEPS (python#156798) pythongh-152936: Make privileged functions available on Android (python#152977) pythongh-123018: Keep the libedit history file header when truncating (pythonGH-157165) ...
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As pointed out in #155966, the exceptional half-integer (0.5, 1.5, etc) inputs of tanpi were not handled properly.
Now, these raise ValueError and this is tested by
test.test_maththrough its list of test cases.In the process of working on this, I noticed that I had incorrectly added duplicate test ids and that this was not treated as an error by the test harness. I have corrected this and made it part of the test.
math.tanpiis untested at its poles and no test-file flag fits #155966