[Bug 1891782] [NEW] python3 Math bug: In accordance with IEEE_754-1985, math.sqrt(-1.25) should return NaN, and print function should be able to indicate it.

[Dan Lott]

Public bug reported:

python3 Math bug: In accordance with IEEE_754-1985, math.sqrt(-1.25)
should return NaN, and print function should be able to indicate it.

Demo code: 
import math
c = math.sqrt(-1.25)
print(c)

When run produces:
Traceback (most recent call last):
  File "./float-test.py", line 4, in <module>
    c = math.sqrt(-1.25)
ValueError: math domain error

Should produce:
NaN
	OR:
NOT A NUMBER

For more information, see https://en.wikipedia.org/wiki/NaN

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: python3 3.8.2-0ubuntu2
ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
Uname: Linux 5.4.0-42-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.6
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: KDE
Date: Sat Aug 15 21:30:13 2020
InstallationDate: Installed on 2020-04-26 (112 days ago)
InstallationMedia: Kubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: python3-defaults
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: python3-defaults (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal

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https://bugs.launchpad.net/bugs/1891782

Title:
  python3 Math bug: In accordance with IEEE_754-1985, math.sqrt(-1.25)
  should return NaN, and print function should be able to indicate it.

Status in python3-defaults package in Ubuntu:
  New

Bug description:
  python3 Math bug: In accordance with IEEE_754-1985, math.sqrt(-1.25)
  should return NaN, and print function should be able to indicate it.

  Demo code: 
  import math
  c = math.sqrt(-1.25)
  print(c)

  When run produces:
  Traceback (most recent call last):
    File "./float-test.py", line 4, in <module>
      c = math.sqrt(-1.25)
  ValueError: math domain error

  Should produce:
  NaN
  	OR:
  NOT A NUMBER

  For more information, see https://en.wikipedia.org/wiki/NaN

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: python3 3.8.2-0ubuntu2
  ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
  Uname: Linux 5.4.0-42-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.6
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: KDE
  Date: Sat Aug 15 21:30:13 2020
  InstallationDate: Installed on 2020-04-26 (112 days ago)
  InstallationMedia: Kubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  ProcEnviron:
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: python3-defaults
  UpgradeStatus: No upgrade log present (probably fresh install)

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