関連ワード:  how to get index of string python    how to check index of string python    how to get last index of string python    how to get first index of string python    how to get index of substring in python    how to get index of element in string python    how to get index of char in string python    how to get index of letter in string python    how to get index of character in string python    how to get index of string in list python