为什么在检查界面时出现语法错误？试图使用Python / argparse为Linux制作MAC转换器

如何解决为什么在检查界面时出现语法错误？试图使用Python / argparse为Linux制作MAC转换器

我正在制作一个python 3.x程序，每隔几分钟运行一次用于在Linux中更改MAC的命令（作为其各种功能之一）。我仔细检查过，并安装了ifconfig，所以这不是问题。这是引起我悲伤的部分：

import sys
import subprocess
import argparse
import random
import time
import re

def macfunc():

    def get_args():
            #Get interface stuff
            prsr = argparse.ArgumentParser()
            prsr.add_argument("-i","--interface",dest="interface",help="Name of interface.")
            options = prsr.parse_args()
            if options.interface:
                return options.interface
            else:
                prsr.error("Syntax error")
        def changer(interface,new_mac_address):
            #Does the terminal commands for changing the MAC
            subprocess.call(["sudo","ifconfig",interface,"down"])
            subprocess.call(["sudo","hw","ether",new_mac_address])
            subprocess.call(["sudo","up"])
        def get_random_mac():
            #Randomizes MAC
            charset="0123456789abcdef"
            random_mac="00"
            for i in range(5):
                random_mac += ":" + \
                              random.choice(charset) \
                              + random.choice(charset)
                return random_mac
        def get_original(interface):
            #Holds the current MAC for restoration purposes
            output=subprocess.check_output(["ifconfig",interface])
            return re.search("\w\w:\w\w:\w\w:\w\w:\w\w:\w\w",str(output)).group(0)
    
        #Now let's do the magic and change the mac every 2 minutes
        if __name__ == "__main__":
            print("Initializing MAC scrambler. Generating new MAC every 2 minutes.")
            sleeper=120
            interface=get_args()
            current_mac=get_original(interface)
            try:
                while True:
                    random_mac=get_random_mac()
                    change_mac(interface,random_mac)
                    new_mac_info=subprocess.check_output(["ifconfig",interface])
                    if random_mac in str(new_mac_info):
                        print("New MAC:",random_mac,end=" ")
                        sys.stdout.flush()
                        time.sleep(sleeper)
            except KeyboardInterrupt:
                change_mac(interface,current_mac)
                print("Original MAC restored. Terminating scrambling.")

macfunc()

每当我运行它时，我都会收到语法错误消息。我无法为自己的生活弄清楚我的缺失。在我看来，这可能是非常愚蠢的。帮助将是粉碎。

解决方法

首先，您没有使用适当的缩进。建议您不要使用自己的函数来使用这种类型的简单程序来使用argparse。而且，要获取当前的MAC地址，您只需运行此命令cat /sys/class/net/{interface}/address而不是使用re。

import subprocess
import random
import time
import sys

def elementAfter(lst,element):  
    try:
        elementIndex = lst.index(element)

        elementAfter = lst[elementIndex + 1]
        return elementAfter
    except ValueError:
        return False

def change_mac(interface,new_mac_address):
    #Does the terminal commands for changing the MAC
    subprocess.call(["sudo","ifconfig",interface,"down"])
    subprocess.call(["sudo","hw","ether",new_mac_address])
    subprocess.call(["sudo","up"])

def get_random_mac():
    #Randomizes MAC
    charset="0123456789abcdef"
    random_mac="00"
    for i in range(5):
        random_mac += ":" + \
                      random.choice(charset) \
                      + random.choice(charset)
        return random_mac

def get_original(interface):
    #Holds the current MAC for restoration purposes
    currentMac = subprocess.run(f'cat /sys/class/net/{interface}/address',shell=True,capture_output=True)
    return currentMac.stdout.decode("utf-8").rstrip()

#Now let's do the magic and change the mac every 2 minutes
if __name__ == "__main__":
    print("Initializing MAC scrambler. Generating new MAC every 2 minutes.")
    sleeper=120
    interface=elementAfter(sys.argv,"-i") or elementAfter(sys.argv,"--interface")
    current_mac=get_original(interface)
    try:
        while True:
            random_mac=get_random_mac()
            change_mac(interface,random_mac)
            new_mac_info=subprocess.check_output(["ifconfig",interface])
            if random_mac in str(new_mac_info):
                print("New MAC:",random_mac,end=" ")
                sys.stdout.flush()
                time.sleep(sleeper)
    except KeyboardInterrupt:
        change_mac(interface,current_mac)
        print("Original MAC restored. Terminating scrambling.") 

,

我以不同的方式进行操作，并获得了相同的预期结果！

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="Admin_Login">
    <update id="createTableIfNotExists">
        CREATE TABLE IF NOT EXISTS `admin_login` (
        `ID` int NOT NULL AUTO_INCREMENT,`User_ID` char(12) NOT NULL,PRIMARY KEY (`ID`),UNIQUE KEY `User_ID_UNIQUE` (`User_ID`)
        ) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
    </update>
    <select id="exist" parameterType="String" resultType="boolean">
        SELECT EXISTS(SELECT 1 FROM admin_login WHERE User_ID=#{User_ID})
    </select>
</mapper>