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[javeme <javaloveme@xxxxxxxxx>]

Public bug reported:

We should not use mutable default arguments in function definitions due
to the "Common Gotchas"[1].

So,  we must remove the default arguments "[]" when the function is defined, such as this function:
https://github.com/openstack/horizon/blob/master/openstack_dashboard/utils/metering.py#L178

[1]: http://docs.python-guide.org/en/latest/writing/gotchas/

** Affects: horizon
     Importance: Undecided
     Assignee: javeme (javaloveme)
         Status: In Progress

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https://bugs.launchpad.net/bugs/1525903

Title:
  should not use mutable default arguments

Status in OpenStack Dashboard (Horizon):
  In Progress

Bug description:
  We should not use mutable default arguments in function definitions
  due to the "Common Gotchas"[1].

  So,  we must remove the default arguments "[]" when the function is defined, such as this function:
  https://github.com/openstack/horizon/blob/master/openstack_dashboard/utils/metering.py#L178

  [1]: http://docs.python-guide.org/en/latest/writing/gotchas/

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