code: def write_long(self, n, pack=Struct('>I').pack):
          
          if 0 <= n <= 0xFFFFFFFF:
              self._output_buffer.extend(pack(n))
          else:
              raise ValueError('Long %d out of range 0..0xFFFFFFFF', n)
          return self
docs: Write an integer as an unsigned 32-bit value.