Discuss - 廖雪峰的官方网站

Discuss / Python / 练习

Back

Topic source

#1 Created at ... [Delete] [Delete and Lock User]

L = ['Bart', 'Lisa', 'Adam'] n =len(L) while n>0: print('Hello,%s!'%L[-n]) n=n-1

#2 Created at ... [Delete] [Delete and Lock User]

请问print('hello,%s!'%L[-n])中的[-n]是什么来的啊！

#3 Created at ... [Delete] [Delete and Lock User]

[n]是list中的名字数量，每个名字可以用0，1，2或-3-2-1调用。这里考虑顺序用[-n],不考虑顺序还可以用[n-1]。

#4 Created at ... [Delete] [Delete and Lock User]

新手还在学习中[-n]方法是在评论中学到的。