默认字典

通过python，编写一个篮球运动员初选功能的代码：

1、提示输入姓名；

2、提示输入身高；

    如果身高大于等于 180 入选，

    如果身高小于等于 180 落选，

3、把入选的与落选的人，通过字典＋列表保存起来

4、最后打印初选结果！

脚本——

import sys

V1 = []
V2 = []

dict1 ={
    'Selected':V1,
    'Uselected':V2
}
while True:
    print("Welcome to the screening process")
    choose = input ("Enter yes or no: ")
    if choose.upper() == 'NO':
        break
    if choose.upper() == 'YES':
        name = input("Enter sb's name: ")
        if name.upper() == 'QUIT':
            exit()
        else:
            pass

        height = input("Enter sb's height: ")
        if height.upper() == 'QUIT':
            exit()
        elif int(height) < 180:
            print("Not suitable for basketball! ")
            dict1['Selected'].append(name)
        else:
            print("Welcome to our training with the team")
            dict1['Uselected'].append(name)
    else:
        continue
print(dict1)

思路：
 1、定义两个空列表，‘V1’‘V2’
 2、在执行判断的时候，根据判断结果往列表中进行数据添加
执行效果：

Welcome to the screening process
Enter yes or no: yes
Enter sb's name: james
Enter sb's height: 210
Welcome to the screening process
Enter yes or no: yes
Enter sb's name: tom
Enter sb's height: 140
Not suitable for basketball!
Welcome to the screening process
Enter yes or no: yes
Enter sb's name: harden
Enter sb's height: 190
Welcome to the screening process
Enter yes or no: no
{'Selected': ['tom'], 'Uselected': ['james', 'harden']}

通过默认字典的方法，来优化代码：

仅仅摘列修改部分——

from collections import defaultdict

dict1 = defaultdict(list)
不再需要事先创建空列表与字典了