实验四

with open('data6_1.txt','r',encoding='utf-8') as f:
    t=[]
    for line in f.readlines():
        m=line.strip().split()
        t.append(m)
    print(t)
t.sort(key=lambda l:l[2],reverse=True)

with open('data6_2.txt','w+',encoding='utf-8') as n:
        for i in t:
            n.write('  '.join(i)+'\n')

with open('data7.txt','r') as f:
    x=[]
    m=f.readlines()
    y=int(input('输入随机抽点人数：'))
    import random
    i=0
    while i<y:
        n=random.randint(1,80)
        a=m[n]
        print(a.strip())
        x.append(a)
        i+=1
import random
import datetime
t=datetime.datetime.now()