def GetSymbol(self, symbol):
return self._symbols[symbol]<EOL>
Tries to find a symbol in the local database.

        Currently, this method only returns message.Message instances, however, if
        may be extended in future to support other symbol types.

        Args:
          symbol: A str, a protocol buffer symbol.

        Returns:
          A Python class corresponding to the symbol.

        Raises:
          KeyError: if the symbol could not be found.