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

[Joao Andre Simioni]

Public bug reported:

[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

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

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https://bugs.launchpad.net/bugs/2137070

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

Status in python-apt package in Ubuntu:
  New

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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