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gh-133895: provide C99 Annex G return values for cmath's functions#134995

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@skirpichevskirpichev commentedJun 1, 2025•
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Now this information is available as the "value" attribute of raised exception objects, for example:

>>>import cmath>>>try:...     cmath.log(complex(-0.0,0))...exceptValueErroras exc:...print(exc.value)...(-inf+3.141592653589793j)

Also uses the AC magic for return value of the cmath.rect().

📚 Documentation preview 📚:https://cpython-previews--134995.org.readthedocs.build/

Now this information is available as the "value" attributeof the ValueError exception object:```pycon>>> import cmath>>> try:...     cmath.log(complex(-0.0, 0))... except ValueError as exc:...     print(exc.value)...(-inf+3.141592653589793j)```Also uses the AC magic for return value of the cmath.rect().
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CC@abhigyan631 as author of#133923

@skirpichevskirpichev changed the titlegh-133895: provide C99 Annex G return values for cmath functionsgh-133895: provide C99 Annex G return values for cmath's functionsJun 1, 2025
Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>
@skirpichevskirpichev marked this pull request as draftJune 2, 2025 09:06
@skirpichevskirpichev marked this pull request as ready for reviewJune 5, 2025 04:40
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skirpichev commentedJun 5, 2025•
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I changed exception handling along the way, suggested by@serhiy-storchaka. I hope I did that right. If so, I can adjust the math's pr.

Now we addvalue to OverflowError's too. This reveals two bugs (in sinh and cosh), fixed.

@skirpichevskirpichev requested a review frompicnixzJune 5, 2025 05:06
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@serhiy-storchakaserhiy-storchakaAwaiting requested review from serhiy-storchaka

@picnixzpicnixzAwaiting requested review from picnixz

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