实验四

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()

　　

if 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')