[Bug 1946971] [NEW] dh-python: generates incorrect dependencies when python3.10 is supported

[Graham Inggs]

Public bug reported:

Test case:

1. Build a python3 package that builds extensions for all supported
python3 versions, i.e. Build-Depends: python3-all-dev

2. Check the generated versioned dependencies on python3

using python3-astlib as an example,

$ grep Depends debian/python3-astlib/DEBIAN/control
Depends: ... python3 (<< 3.10), python3 (>= 3.1~), ...

Expected output:

$ grep Depends debian/python3-astlib/DEBIAN/control
Depends: ... python3 (<< 3.11), python3 (>= 3.9~), ...

** Affects: dh-python (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1946971

Title:
  dh-python: generates incorrect dependencies when python3.10 is
  supported

Status in dh-python package in Ubuntu:
  New

Bug description:
  Test case:

  1. Build a python3 package that builds extensions for all supported
  python3 versions, i.e. Build-Depends: python3-all-dev

  2. Check the generated versioned dependencies on python3

  using python3-astlib as an example,

  $ grep Depends debian/python3-astlib/DEBIAN/control
  Depends: ... python3 (<< 3.10), python3 (>= 3.1~), ...

  Expected output:

  $ grep Depends debian/python3-astlib/DEBIAN/control
  Depends: ... python3 (<< 3.11), python3 (>= 3.9~), ...

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