What is the difference between First Class and Business Class? These seats get mixed up often, so hopefully this helps clear it up! This is excluding first class flights in America of course 😂 For me flying in business class feels comfortable while flying in first feels luxurious. You can book all of these same flights for much cheaper by using miles and points. Check out @upgradedpoints for the best step by step process on how to book! #firstclass #businessclass #flights #upgradedpoints | Coun

在Python语言中，函数是第一类对象（first-class objects）_哔哩哔哩_bilibili