old_contents: from swimlane.core.resources.revision_base import RevisionBase
  
  
  class RecordRevision(RevisionBase):
      """
      Encapsulates a single revision returned from a History lookup.
  
      Attributes:
          app_revision_number: The app revision number this record revision was created using.
  
      Properties:
          app_version: Returns an App corresponding to the app_revision_number of this record revision.
          version: Returns a Record corresponding to the app_version and data contained in this record revision.
      """
      def __init__(self, app, raw):
          super(RecordRevision, self).__init__(app._swimlane, raw)
  
          self.__app_version = None
          self._app = app
  
          self.app_revision_number = self._raw_version['applicationRevision']
  
      @property
      def app_version(self):
          """The app revision corresponding to this record revision. Lazy loaded"""
          if not self.__app_version:
              self.__app_version = self._app.revisions.get(self.app_revision_number).version
          return self.__app_version
  
      @property
      def version(self):
          """The record contained in this record revision. Lazy loaded. Overridden from base class."""
          if not self._version:
              # avoid circular imports
              from swimlane.core.resources.record import Record
              self._version = Record(self.app_version, self._raw_version)
          return self._version
  
new_contents: from swimlane.core.resources.record import Record
  from swimlane.core.resources.revision_base import RevisionBase
  
  
  class RecordRevision(RevisionBase):
      """
      Encapsulates a single revision returned from a History lookup.
  
      Attributes:
          app_revision_number: The app revision number this record revision was created using.
  
      Properties:
          app_version: Returns an App corresponding to the app_revision_number of this record revision.
          version: Returns a Record corresponding to the app_version and data contained in this record revision.
      """
      def __init__(self, app, raw):
          super(RecordRevision, self).__init__(app._swimlane, raw)
  
          self.__app_version = None
          self._app = app
  
          self.app_revision_number = self._raw_version['applicationRevision']
  
      @property
      def app_version(self):
          """The app revision corresponding to this record revision. Lazy loaded"""
          if not self.__app_version:
              self.__app_version = self._app.revisions.get(self.app_revision_number).version
          return self.__app_version
  
      @property
      def version(self):
          """The record contained in this record revision. Lazy loaded. Overridden from base class."""
          if not self._version:
              self._version = Record(self.app_version, self._raw_version)
          return self._version
  
subject: move import to top of record_revision.py