[Bug 2137070] Re: python3-apt 2.0.1ubuntu0.20.04.1+esm1 version does not comply with PEP 440

[Julian Andres Klode]

The esm version string is completely broken as python-apt us a native
package

2.0.1-ubuntu0.20.04.1-esm1

would need to be

2.0.1ubuntu0.20.04.1esm1

But I don't see the package version, the pip version is auto-generated
from it

** Also affects: ubuntu-pro
   Importance: Undecided
       Status: New

** Changed in: python-apt (Ubuntu)
       Status: Confirmed => Invalid

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Title:
  python3-apt 2.0.1ubuntu0.20.04.1+esm1 version does not comply with PEP
  440

Status in Ubuntu Pro:
  New
Status in python-apt package in Ubuntu:
  Incomplete

Bug description:
  [Description]

  The latest release of python3-apt (2.0.1ubuntu0.20.04.1+esm1) is
  setting the python version to:

  $ pip list | grep apt
  python-apt          2.0.1-ubuntu0.20.04.1-esm1

  This version is not compliant with PEP440 and breaks with other
  software that will check versions:

  $ python3
  Python 3.8.10 (default, Nov 17 2025, 15:36:31) 
  [GCC 9.4.0] on linux
  Type "help", "copyright", "credits" or "license" for more information.
  >>> from packaging.version import parse, Version
  >>> Version("2.0.1-ubuntu0.20.04.1-esm1").micro
  Traceback (most recent call last):
    File "<stdin>", line 1, in <module>
    File "/usr/lib/python3/dist-packages/packaging/version.py", line 277, in __init__
      raise InvalidVersion("Invalid version: '{0}'".format(version))
  packaging.version.InvalidVersion: Invalid version: '2.0.1-ubuntu0.20.04.1-esm1'

  The latest non ESM version works correctly:

  $ pip list | grep apt
  python-apt          2.0.1+ubuntu0.20.4.1

  Notice the replacement of (+) with (-) between the version (2.0.1) and
  the ubuntu0.20.04.1. (+) is the correct separator for local versions:

  https://peps.python.org/pep-0440/#local-version-segments
  https://peps.python.org/pep-0440/#development-release-separators

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