[Bug 1949778] Re: unittest2 doesn't work on python3.10

[Athos Ribeiro]

Tracking python-deprecation due to
https://launchpad.net/ubuntu/+source/python-
deprecation/2.1.0-2/+build/22303569

** Also affects: python-deprecation (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: python-tosca-parser (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1949778

Title:
  unittest2 doesn't work on python3.10

Status in python-deprecation package in Ubuntu:
  New
Status in python-launchpadlib package in Ubuntu:
  New
Status in python-testtools package in Ubuntu:
  New
Status in python-tosca-parser package in Ubuntu:
  New
Status in python-yaql package in Ubuntu:
  New
Status in unittest2 package in Ubuntu:
  New
Status in unittest2 package in Debian:
  New

Bug description:
  Since Python 3.3, using or importing ABCs from 'collections' instead
  of 'collections.abc' has been deprecated, and it's finally removed in
  python 3.10. Because unittest2 relies on these collections in it's
  compatibility helpers, it fails to run on 3.10

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