関連ワード:  how to access items in a set python    how to access element in a set python    how to access values in a set python    how to get element in a set python    how to access first element in a set python    how to get items in set python    how to get first element in a set python    how to get values in set python    how to get the number of items in a set python    how to access single element in set python