def message_definition(self):
    """Get Message definition that contains this Field definition.

    Returns:
      Containing Message definition for Field.  Will return None if for
      some reason Field is defined outside of a Message class.
    """
    try:
      return self._message_definition()
    except __HOLE__:
      return None
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/protorpc/protorpc/messages.py/Field.message_definition