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[3.12] gh-109218: Improve documentation for the complex() constructor (GH-119687) #119805

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@serhiy-storchaka serhiy-storchaka commented May 30, 2024

  • Remove the equivalence with real+imag*1j which can be incorrect in corner cases (non-finite numbers, the sign of zeroes).
  • Separately document the three roles of the constructor: parsing a string, converting a number, and constructing a complex from components.
  • Document positional-only parameters of complex(), float(), int() and bool() as positional-only.
  • Add examples for complex() and int().
  • Specify the grammar of the string for complex().
  • Improve the grammar of the string for float().
  • Describe more explicitly the behavior when real and/or imag arguments are complex numbers. (This will be deprecated in future.) (cherry picked from commit ec1ba26)

📚 Documentation preview 📚: https://cpython-previews--119805.org.readthedocs.build/

…ructor (pythonGH-119687)

* Remove the equivalence with real+imag*1j which can be incorrect in corner
  cases (non-finite numbers, the sign of zeroes).
* Separately document the three roles of the constructor: parsing a string,
  converting a number, and constructing a complex from components.
* Document positional-only parameters of complex(), float(), int() and bool()
  as positional-only.
* Add examples for complex() and int().
* Specify the grammar of the string for complex().
* Improve the grammar of the string for float().
* Describe more explicitly the behavior when real and/or imag arguments are
  complex numbers. (This will be deprecated in future.)
(cherry picked from commit ec1ba26)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
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