関連ワード:  how to get index of string in python    how to get index of substring in python    how to return index of string in python    how to check index of string in python    how to get position of string in python    how to get index value of string in python    how to get last index of string in python    how to get index number of string in python    how to get index position of string in python    how to get first index of string in python