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[Russell Bryant <1327473@xxxxxxxxxxxxxxxxxx>]

** Changed in: nova
       Status: Fix Committed => Fix Released

** Changed in: nova
    Milestone: None => juno-2

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https://bugs.launchpad.net/bugs/1327473

Title:
  Don't use mutables as default args

Status in Cinder:
  Fix Committed
Status in Orchestration API (Heat):
  Fix Committed
Status in OpenStack Neutron (virtual network service):
  In Progress
Status in OpenStack Compute (Nova):
  Fix Released
Status in Messaging API for OpenStack:
  Fix Committed
Status in Python client library for heat:
  In Progress

Bug description:
  
  Passing mutable objects as default args is a known Python pitfall.
  We'd better avoid this.

  This is an  example show the pitfall:
  http://docs.python-guide.org/en/latest/writing/gotchas/

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