[Bug 2002819] Re: dh-python: Deps guarded by (python3 << 3.X) break python-3.(X-1) use

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** Changed in: dh-python (Debian)
   Importance: Undecided => Unknown

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Title:
  dh-python: Deps guarded by (python3 << 3.X) break python-3.(X-1) use

Status in dh-python package in Ubuntu:
  New
Status in dh-python package in Debian:
  New

Bug description:
  Imported from Debian bug http://bugs.debian.org/1028603:

  Package: dh-python
  Version: 5.20221001
  Severity: normal
  X-Debbugs-Cc: schopin at ubuntu.com

  For instance, pylint has "tomli>=1.1.0;python_version<'3.11'" in its
  pyproject.toml, which is translated as "python3-tomli (>= 1.1.0) |
  python3 (>= 3.11)".

  This means that if we have python == 3.11 but still have python3.10 in
  the archive, any code that iterates over all supported archive risks
  failing simply due to the tomli module missing.

  This is currently happening in the distro-info autopkgtests for the
  python3-defaults migration from unstable to testing (and also in
  Ubuntu). I'll probably be adding tomli as a test dependency in Ubuntu as
  a stopgap, but I figured someone might think of a better long-term
  solution to the issue.

  -- System Information:
  Debian Release: bookworm/sid
    APT prefers kinetic-updates
    APT policy: (500, 'kinetic-updates'), (500, 'kinetic-security'), (500, 'kinetic'), (400, 'kinetic-proposed'), (100, 'kinetic-backports')
  Architecture: amd64 (x86_64)
  Foreign Architectures: i386

  Kernel: Linux 5.19.0-29-generic (SMP w/24 CPU threads; PREEMPT)
  Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
  Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE not set
  Shell: /bin/sh linked to /usr/bin/dash
  Init: systemd (via /run/systemd/system)
  LSM: AppArmor: enabled

  Versions of packages dh-python depends on:
  ii  python3            3.10.6-1
  ii  python3-distutils  3.10.7-1

  dh-python recommends no packages.

  Versions of packages dh-python suggests:
  ii  dpkg-dev           1.21.9ubuntu1
  pn  flit               <none>
  ii  libdpkg-perl       1.21.9ubuntu1
  pn  python3-build      <none>
  pn  python3-installer  <none>
  ii  python3-tomli      2.0.1-1

  -- no debconf information

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