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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

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

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https://bugs.launchpad.net/bugs/1288049

Title:
  Lazy translation fails for complex formatting

Status in OpenStack Compute (Nova):
  Confirmed
Status in Oslo - a Library of Common OpenStack Code:
  Fix Released

Bug description:
  When lazy translation is enabled _() returns a gettextutils.Message
  instance.   When formatting (%) is called on the instance rather than
  apply the replacement values, it gathers them so they can be applied
  when the message is lazily translated.   This support includes the use
  of keyword replacement as part of formatting (passing a dictionary).
  In order to limit the size of the dictionary, especially in the case
  where locales is passed, the dictionary of values is limited to only
  those keywords that are actually referenced in the format string.

  The code that extracts the replacement keys (and thus dictionary
  entries to keep) only handles simple formatting.  Currently it does
  not handle things like '%(key).02f', but instead omits them from the
  dictionary, which causes a KeyError when the message is translated and
  the replacements applied.

  Confirmed that regex that extracts the keywords does not handle this case: 
  https://github.com/openstack/oslo-incubator/blob/master/openstack/common/gettextutils.py#L266

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