docs: def marshall(self):
          """Return the measurement in the line protocol format.
  
          :rtype: str
  
          """
          return '{},{} {} {}'.format(
              self._escape(self.name),
              ','.join(['{}={}'.format(self._escape(k), self._escape(v))
                        for k, v in self.tags.items()]),
              self._marshall_fields(),
              int(self.timestamp * 1000))