def on_button_clicked ( self , widget , settings ) :
    a = ComposeDialog ( self . main_window , widget , settings )
    resp = a . run )
    a . destroy ( )

def on_button_clicked ( self , widget , settings ) :
    a = ComposeDialog ( self . main_window , widget , settings )
    resp = a . run ( )
    a . destroy ( )

次に示すpythonコードの誤りを修正しなさい。