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[Bug 1248443] Re: Wrong comparisons with "in" operator

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>
Date: Wed, 04 Dec 2013 10:37:20 -0000
Reply-to: Bug 1248443 <1248443@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

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

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https://bugs.launchpad.net/bugs/1248443

Title:
  Wrong comparisons with "in" operator

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  In the code there are several comparisons using the "in" operator to
  check if a value occurs in a tuple with only one element, like:

      if a in ("foo"):
          do_something()

  This comparison is wrong, since that is not a tuple with one element
  [1], therefore if the variable "a" had a value of "f" it will match.

  [1] http://docs.python.org/2/tutorial/datastructures.html#tuples-and-
  sequences

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