[Bug 1780099] Update Released

[Łukasz Zemczak]

The verification of the Stable Release Update for python-apt has
completed successfully and the package has now been released to
-updates.  Subsequently, the Ubuntu Stable Release Updates Team is being
unsubscribed and will not receive messages about this bug report.  In
the event that you encounter a regression using the package from
-updates please report a new bug using ubuntu-bug and tag the bug report
regression-update so we can easily find any regressions.

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https://bugs.launchpad.net/bugs/1780099

Title:
  Cache remapping breaks hashing of Package objects

Status in python-apt package in Ubuntu:
  Fix Committed
Status in python-apt source package in Bionic:
  Fix Released

Bug description:
  [Impact]
  The apt.Package objects use the id as the hash, but the hash can change after reopening, meaning that code will fail to work, for example:

  c=apt.Cache()
  p=c["a"]
  set_of_p={p}
  c.open()
  assert p in set_of_p

  will fail.

  [Test case]
  The above test case is run as part of autopkgtest (syntax is slightly different), so passing autopkgtests means verification is done.

  [Regression potential]
  Hashing packages objects will be slower as it hashes the name and architecture now.

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