code: def find_users(self, *args):
          
          if args:
              names = reduce(lambda query, arg: query |
                  (Q(first_name__icontains=arg) | Q(last_name__icontains=arg)),
                  args, Q())  # noqa
              users = User.objects.filter(names)
          # If no args given, check every user
          else:
              users = User.objects.all()
          # Display errors if no user was found
          if not users.count() and args:
              if len(args) == 1:
                  raise CommandError('No user was found with the name %s' % args[0])
              else:
                  arg_list = ', '.join(args)
                  raise CommandError('No users found with the names: %s' % arg_list)
          return users
docs: Returns the users to search given names as args.
          Return all users if there are no args provided.