関連ワード:  how to use double for loop in python    how to use nested for loop in python    how to use two for loops in python    how to use multiple for loops in python    how to use two variables in for loop in python    how to use multiple variables in for loop in python    how to use nested for loop in list comprehension python    how to use nested while loop in python    how to double for loop in python    how to use multiple while loops in python