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[3.10] gh-85417: Clarify behaviour on branch cuts in cmath module (GH-102046) #102275

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Feb 26, 2023

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@miss-islington miss-islington commented Feb 26, 2023

This PR updates the cmath module documentation to reflect the reality that Python is almost always (and as far as I can tell, that "almost" can be omitted) running on a machine whose C double supports signed zeros.

  • Removes misleading references to functions being continuous from above / below / the left / the right at branch cuts
  • Expands the note on branch cuts at the top of the module documentation to explain the double-sided sign-of-zero-based behaviour
    (cherry picked from commit b513c46)

Co-authored-by: Mark Dickinson [email protected]

…honGH-102046)

This PR updates the cmath module documentation to reflect the reality that Python is almost always (and as far as I can tell, that "almost" can be omitted) running on a machine whose C double supports signed zeros.

* Removes misleading references to functions being continuous from above / below / the left / the right at branch cuts
* Expands the note on branch cuts at the top of the module documentation to explain the double-sided sign-of-zero-based behaviour
(cherry picked from commit b513c46)

Co-authored-by: Mark Dickinson <[email protected]>
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