import string
string.ascii_uppercase # 獲取26個大寫字母 (ABCDEFGHIJKLMNOPQRSTUVWXYZ <class 'str'>)
string.ascii_lowercase # 獲取26個小寫字母 (abcdefghijklmnopqrstuvwxyz <class 'str'>)
string.ascii_letters # 獲取26個小寫字母和26個大寫字母 (abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ <class 'str'>)