python学习-enumerate为可迭代的对象添加序号

 1 # !/usr/bin/env python
 2 # -*- coding:utf-8 -*-
 3 # li = ["电脑","U盘","鼠标","游艇"]
 4 # for item in li:
 5 #     print(item)
 6 # input = input("请输入商品：")
 7
 8 #enumrate自动生成一列,默认0 自增1
 9 #字符串 =》数字  int（字符串）
10 li = ["电脑","U盘","鼠标","游艇"]
11 for key,item in enumerate(li,1):
12     print(key,item)
13 inp = input("请输入商品：")
14
15 inp_num = int(inp)
16 print(li[inp_num-1])