[Bug 1850283] Re: python-ldap package prevents python3-only build

[Frank Heimes]

I just installed python3-ldap on 19.10 and 18.04 and it installs fine on
both.

You're right that it pulls in some python(2) packages:

$ sudo apt --no-install-recommends install python3-ldap 
[sudo] password for ubuntu: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following additional packages will be installed:
  libpython-stdlib libpython2.7-minimal libpython2.7-stdlib python python-ldap
  python-minimal python-pyasn1 python-pyasn1-modules python2.7
  python2.7-minimal python3-pyasn1 python3-pyasn1-modules
Suggested packages:
  python-doc python-tk python2.7-doc binutils binfmt-support
The following NEW packages will be installed:
  libpython-stdlib libpython2.7-minimal libpython2.7-stdlib python python-ldap
  python-minimal python-pyasn1 python-pyasn1-modules python2.7
  python2.7-minimal python3-ldap python3-pyasn1 python3-pyasn1-modules
0 upgraded, 13 newly installed, 0 to remove and 0 not upgraded.
...

The needed packages are all in main, hence are all fully supported - as the following command shows:
apt show python libpython-stdlib libpython2.7-minimal libpython2.7-stdlib python python-ldap python-minimal python-pyasn1 python-pyasn1-modules python2.7 python2.7-minimal python3-ldap python3-pyasn1 python3-pyasn1-modules | grep 'Supported\|APT-Sources'


The situation in 19.10/Eoan (and therefore also in Focal) is different - if python3-ldap is installed there, no python2 packages are pulled-in:

$ sudo apt install python3-ldap
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following additional packages will be installed:
  python3-pyasn1 python3-pyasn1-modules
The following NEW packages will be installed:
  python3-ldap python3-pyasn1 python3-pyasn1-modules
0 upgraded, 3 newly installed, 0 to remove and 0 not upgraded.

I'm not sure what you are going to accomplish - why do you want to get rid of the python2-related packages in bionic already?
Please notice that any patched and/or recompiled packages are usually w/o support - just the one from the archives are in support.

** Changed in: python-ldap (Ubuntu)
       Status: New => Incomplete

** Also affects: ubuntu-z-systems
   Importance: Undecided
       Status: New

** Changed in: ubuntu-z-systems
   Importance: Undecided => Wishlist

** Changed in: ubuntu-z-systems
       Status: New => Incomplete

** Changed in: ubuntu-z-systems
     Assignee: (unassigned) => Canonical Foundations Team (canonical-foundations)

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https://bugs.launchpad.net/bugs/1850283

Title:
  python-ldap package prevents python3-only build

Status in Ubuntu on IBM z Systems:
  Incomplete
Status in python-ldap package in Ubuntu:
  Incomplete

Bug description:
  By moving away from Python2 following problem occured.

  The package Package: python3-ldap (3.0.0-1) is dependent on 
  Package: python-ldap (3.0.0-1).

  This has a dependency: python interactive high-level object-oriented language (default version)
  python (<< 2.8)
  python (>= 2.7~)

  see https://packages.ubuntu.com/bionic/python-ldap

  We need Canonicals support for a backport the changes from
  https://packages.debian.org/buster/python3-ldap ,which resolves this
  python2 dependency.

  Many thanks in advance.

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