Gets a string showing the return type and modifiers for the
        function in a nice display format.

def returns(self):
        """Gets a string showing the return type and modifiers for the
        function in a nice display format."""
        kind = "({}) ".format(self.kind) if self.kind is not None else ""      
        mods = ", ".join(self.modifiers) + " "
        dtype = self.dtype if self.dtype is not None else ""
        return "{}{}{}".format(dtype, kind, mods)