题目要求：

1. 生成一个大文件ips.txt,要求1200行，每行随机为172.25.254.0/24段的ip;
2. 读取ips.txt文件统计这个文件中ip出现频率排前10的ip;

import random
def create_ip_file(filename):
    ips = ['172.25.254.'+str(i) for i in range(1,255)]
    print(ips)
    with open(filename,'a+')as f:
        for count in range(1200):
            print(random.sample(ips,1))
            f.write(random.sample(ips,1)[0])
create_ip_file('ips.txt')
def sorted_ip(filename,count=10):
    ips_dict=dict()
    with open(filename) as f:
        for ip in f:
            if ip in ips_dict:
                ips_dict[ip]+=1
            else:
                ips_dict[ip]=1
    sorted_ip=sorted(ips_dict.items(),key=lambda x:x[1],reverse=True)[:count]
    return sorted_ip
print(sorted_ip('ips.txt'))

结果是：

['172.25.254.132']
['172.25.254.150']
['172.25.254.107']
['172.25.254.186']
['172.25.254.59']
['172.25.254.47']
['172.25.254.120']
['172.25.254.246']
['172.25.254.81']
[('172.25.254.185\n', 18), ('172.25.254.229\n', 18), ('172.25.254.21\n', 17), ('172.25.254.99\n', 17), ('172.25.254.100\n', 16), ('172.25.254.61\n', 16), ('172.25.254.228\n', 16), ('172.25.254.117\n', 16), ('172.25.254.60\n', 16), ('172.25.254.221\n', 15)]