code: def write_long_at(self, n, pos, pack_into=Struct('>I').pack_into):
          '''
          Write an unsigned 32bit value at a specific position in the buffer.
          Used for writing tables and frames.
          '''
          if 0 <= n <= 0xFFFFFFFF:
              pack_into(self._output_buffer, pos, n)
          else:
              raise ValueError('Long %d out of range 0..0xFFFFFFFF', n)
          return self write_long_at(self, n, pos, pack_into=Struct('>I').pack_into):
          '''
          Write an unsigned 32bit value at a specific position in the buffer.
          Used for writing tables and frames.
          '''
          if 0 <= n <= 0xFFFFFFFF:
              pack_into(self._output_buffer, pos, n)
          else:
              raise ValueError('Long %d out of range 0..0xFFFFFFFF', n)
          return self
docs: Write an unsigned 32bit value at a specific position in the buffer.
          Used for writing tables and frames.