实验6

def is_valid(n):    n=str(n)    while len(n)==18:        for i in n:            if i.isdigit()==False and i!='X':                return False        return True        break    else:        return Falsewith open('data3.txt', 'r', encoding='utf-8') as f:    data=f.read().split('\n')data1=data[1:]data2=[]for i in range(len(data1)):    data1[i]=data1[i].split(',')    if is_valid(data1[i][-1])==True:        data2.append(data1[i])dic=dict()for j in data2:    j[1]=j[1][6:14]    dic[j[0]]=j[1]

list= list(dic.items())
list1=sorted(list)
for key, value in list1:
    print(f'{value}: {key}')

测试5

with open('data5.txt', 'r', encoding='utf-8') as f:    data = f.read().split('\n')import randomn=random.randint(1,len(data))list=[]list=random.sample(data, n)import datetimet = datetime.datetime.now()filename = t.strftime('%Y%m%d') + '.txt'with open(filename, 'w', encoding='utf-8') as f:    f.writelines('\n'.join(list))