对于文件中输入的内容从大到小排序

lst = []
while True:
    n = input()
    if not n:
        break
    lst.append(n.split())

lst = sorted(lst, key=lambda x:x[1], reverse=True)
#print(lst)
with open('result.txt', 'w') as f:
    for i in lst[:3]:
        f.write(i[0]+'\n')

 Mike 2019001
 Bob 2019002
 Lily 2019004
 Lucy 2019003
 John 2019005