实验四

with open('data6_1.txt','r',encoding='utf-8') as f:
  n=[]
  for line in f.readlines():
m=line.split()
n.append(m)
n.sort(key=lambda l:l[2],reverse=True)
with open('data6_2.txt','w+',encoding='utf-8') as s:
  for i in n:
     s.write(' '.join(i)+'\n')

 实验七

不会呀