pycharm运行代码为什么能占用内存一直在增长？？

问题遇到的现象和发生背景
记录DNS服务器是否丢包问题

问题相关代码，请勿粘贴截图

import os
import time
def dns():
    i = 2698
    success = 2698
    fail = 0
    while True:
        dns_list = ["www.baidu.com", "www.sina.com.cn", "xa.58.com", "www.douyin.com",
                "ai.taobao.com", "www.apple.com.cn", "www.jd.com", "cn.bing.com"]
        os.system("ipconfig/flushdns")
        for dns in dns_list:
            ns = os.popen("nslookup "+dns+" 114.114.114.114")
            time.sleep(2)
            x = ns.read()
            a = x.splitlines(keepends=True)
            #print(x)
            #print(a[-1::-1])
            pathfile = "D:\python_code\pythondaima\socket\dns.txt"
            file = open(pathfile, "a")
            file.write(x)
            i = i+1
            if "Aliases:  "+dns+"\n" in a[-1::-1]:
                file.write("这服务器为114第%s次，解析成功\n" % i)
                success = success+1
            else:
                file.write("这服务器为114第%s次，解析失败\n" % i)
                fail = fail+1
            file.write("*****服务器为114****一共执行%s,成功的次数%s，失败的次数%s,当前域名%s*********\n" %(i, success, fail, dns))
            file.close()



dns()

这个是一个code片段另外一个是一模一样，就是文件存放的路径不一样，为什么第一个能占这么高内存呀？？

你在最后加个ns.close()试下,放file.close()下面