code: def migrate(self, host, port, key, dest_db, timeout, *,
                  copy=False, replace=False):
          
          if not isinstance(host, str):
              raise TypeError("host argument must be str")
          if not isinstance(timeout, int):
              raise TypeError("timeout argument must be int")
          if not isinstance(dest_db, int):
              raise TypeError("dest_db argument must be int")
          if not host:
              raise ValueError("Got empty host")
          if dest_db < 0:
              raise ValueError("dest_db must be greater equal 0")
          if timeout < 0:
              raise ValueError("timeout must be greater equal 0")
  
          flags = []
          if copy:
              flags.append(b'COPY')
          if replace:
              flags.append(b'REPLACE')
          fut = self.execute(b'MIGRATE', host, port,
                             key, dest_db, timeout, *flags)
          return wait_ok(fut)
docs: Atomically transfer a key from a Redis instance to another one.