parameters: (self)
return_statement: return bool(self.__keys)
docstring: @rtype:  bool
          @return: C{False} if there are no known keys.
function: def __bool__(self):
          """
          @rtype:  bool
          @return: C{False} if there are no known keys.
          """
          return bool(self.__keys)
function_tokens: def __bool__ ( self ) : return bool ( self . __keys )