def display self ) :
    print ( "str" . join ( "str" . join ( "str" if p else "str" for p in row )
        for row in self . data )

def display ( self ) :
    print ( "str" . join ( "str" . join ( "str" if p else "str" for p in row )
        for row in self . data ) )

次に示すpythonコードの誤りを修正しなさい。