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["ChangBo Guo\(gcb\)" <glongwave@xxxxxxxxx>]

** Also affects: oslo.messaging
   Importance: Undecided
       Status: New

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

Title:
  Don't use mutables as default args

Status in OpenStack Compute (Nova):
  In Progress
Status in Messaging API for OpenStack:
  New

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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