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[zhangjialong <zhangjl@xxxxxxxxxxx>]

** Changed in: nova
     Assignee: zhangjialong (zhangjl) => (unassigned)

** Changed in: nova
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1431195

Title:
  Wrong usage of dict in nova/block_device.py

Status in OpenStack Compute (Nova):
  Invalid

Bug description:
  In the method named _validate of BlockDeviceDict class, there were
  some codes like follows:

      def _validate(self, bdm_dict):                                       
          """Basic data format validations."""                             
          dict_fields = set(key for key, _ in bdm_dict.iteritems()) 

  While, bdm_dict was kown as dict type.When we wanted to got its` keys, 
  do like follows maybe better: 

          dict_fields = set(bdm_dict)

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