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[Bug 1471349] Re: Eliminate default value as a mutable object

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Timur Sufiev <tsufiev@xxxxxxxxxxxx>
Date: Mon, 21 Sep 2015 10:21:49 -0000
Reply-to: Bug 1471349 <1471349@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

I find this check highly valuable and think it could be generalized for
other OpenStack projects as well. Particularly, for Horizon.

** Also affects: horizon
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1471349

Title:
  Eliminate default value as a mutable object

Status in OpenStack Dashboard (Horizon):
  In Progress
Status in Magnum:
  Fix Committed

Bug description:
  The default value is evaluated only once. This makes a difference when
  the default is a mutable object such as a list, dictionary, or
  instances of most classes. Magnum should follow what Python suggests:
  Do not to use mutable object as a default value.

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