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[Bug 1229071] Re: Make sure powervm driver's exception with appropriate kwargs

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: ChangBo Guo <guochbo@xxxxxxxxxx>
Date: Mon, 23 Sep 2013 21:21:46 -0000
Reply-to: Bug 1229071 <1229071@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

** Changed in: nova
       Status: In Progress => Invalid

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https://bugs.launchpad.net/bugs/1229071

Title:
  Make sure  powervm driver's exception  with appropriate kwargs

Status in OpenStack Compute (Nova):
  Invalid

Bug description:
  Exception inherit from NovaException  has property fmt_msg . 
  If the fmt_msg  include  %(some_key)s , and  kwargs is empty due to no key-value pair is paassed when construct the exception ,
  will lead KeyError . See https://github.com/openstack/nova/blob/master/nova/exception.py#L120

  
  This is an example:
  >>> kw ={'a':'a','b':'b'}
  >>> print('this is %(a)s' % kw)
  this is a

  >>> print('this is %(a)s' % {})
  Traceback (most recent call last):
    File "<stdin>", line 1, in <module>
  KeyError: 'a'

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