cmd命令行修改文件内容（用来更改本地hosts）

主要用来修改本地hosts文件
1、将run.py文件放在C:\Users\Administrator目录下
2.打开cmd命令行。执行

python run.py add 127.0.01 www.baidu.com
python run.py del 127.0.01 www.baidu.com

run.py 内容

# -*- coding: cp936 -*-  
# 防止命令行显示中文乱码
import sys
import os
path = "文件路径"

def add(ip , domain): # 在文件下增加内容
    try:
        with open(path, 'a+') as text:
            for line in text.readlines():
                if ip + " "+ domain  in line:
                    print("已经存在")
                    break

            text.write("\n"+ ip + " "+ domain)
    except:
        print("添加出错")

def delete(ip , domain):
    with open(path) as text, open('2.txt', "w") as new_text:
        try:
            for line in text.readlines():
                new_line = line.replace("\n"+ip + " "+ domain, "")
                new_text.write(new_line)
        except:
            print("删除出错")
    os.remove(path)
    os.rename("2.txt", "文件名")
    
if __name__ == '__main__':

    command = sys.argv[1].lower() # 参数一
    ip = sys.argv[2] # 参数二
    domain = sys.argv[3] # 参数三
    
    if command == "add":
        add(ip, domain)
    elif command == "del":
        delete(ip, domain)
    else:
        print("没有此命令")