docs: def get_logical_drive_by_wwn(self, wwn):
          """Get the logical drive object given the wwn.
  
          This method returns the logical drive object with the given wwn.
  
          :param wwn: wwn of the logical drive
          :returns: LogicalDrive object which has the wwn or None if
              logical drive is not found.
          """
          disk = [x for x in self.get_logical_drives() if x.wwn == wwn]
          if disk:
              return disk[0]
          return None