code: def read(self, size=None):  # pylint: disable=missing-docstring
          
          if size is not None:
              read_size = min(size, self.__remaining_bytes)
          else:
              read_size = self.__remaining_bytes
          data = self.__stream.read(read_size)
          if read_size > 0 and not data:
              raise exceptions.StreamExhausted(
                  'Not enough bytes in stream; expected %d, exhausted '
                  'after %d' % (
                      self.__max_bytes,
                      self.__max_bytes - self.__remaining_bytes))
          self.__remaining_bytes -= len(data)
          return data
docs: Read at most size bytes from this slice.
  
          Compared to other streams, there is one case where we may
          unexpectedly raise an exception on read: if the underlying stream
          is exhausted (i.e. returns no bytes on read), and the size of this
          slice indicates we should still be able to read more bytes, we
          raise exceptions.StreamExhausted.
  
          Args:
            size: If provided, read no more than size bytes from the stream.
  
          Returns:
            The bytes read from this slice.
  
          Raises:
            exceptions.StreamExhausted