code: def FindMessageTypeByName(self, full_name):
      
  
      full_name = _NormalizeFullyQualifiedName(full_name)
      if full_name not in self._descriptors:
        self.FindFileContainingSymbol(full_name)
      return self._descriptors[full_name]
docs: Loads the named descriptor from the pool.
  
      Args:
        full_name: The full name of the descriptor to load.
  
      Returns:
        The descriptor for the named type.