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This bug was fixed in the package python-cassandra-driver -
2.5.1-1ubuntu0.1

---------------
python-cassandra-driver (2.5.1-1ubuntu0.1) xenial; urgency=high

  * Cherry-pick upstream commit to fix compat with python 2.7.12 -
    weakref.ref no longer accepts kwargs. (LP: #1603436)

 -- Dimitri John Ledkov <xnox@xxxxxxxxxx>  Mon, 25 Jul 2016 12:17:29
+0100

** Changed in: python-cassandra-driver (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1603436

Title:
  Regression in python2.7 SRU breaks python-cassandra

Status in python-cassandra-driver package in Ubuntu:
  Fix Released
Status in python2.7 package in Ubuntu:
  Invalid
Status in python-cassandra-driver source package in Xenial:
  Fix Released
Status in python2.7 source package in Xenial:
  Invalid
Status in python-cassandra-driver source package in Yakkety:
  Fix Released
Status in python2.7 source package in Yakkety:
  Invalid

Bug description:
  "SRU: backport python 2.7.12 to 16.04 LTS" (bug 1591895) has caused a
  regression in (at least) python-cassandra. Any attempt to connect to a
  cluster fails due to:

  Traceback (most recent call last):
    File "/usr/lib/python2.7/dist-packages/cassandra/cluster.py", line 1894, in _reconnect_internal
      return self._try_connect(host)
    File "/usr/lib/python2.7/dist-packages/cassandra/cluster.py", line 1921, in _try_connect
      self_weakref = weakref.ref(self, callback=partial(_clear_watcher, weakref.proxy(connection)))
  TypeError: ref() does not take keyword arguments

  It would appear that Python 2.7.12 has made the permitted calling
  conventions for weakref.ref() stricter.

  See https://github.com/datastax/python-driver/pull/585 for upstream
  discussion of the issue.

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