修复 Python tkinter 中的 'AttributeError: '_tkinter.tkapp' object has no attribute 'add'' 错误

非常抱歉给你带来了困扰。根据你的要求，以下是修改后的代码，其中修复了tab_control.add的错误，并给出了需要被替换的代码和替换的代码：

import requests
from bs4 import BeautifulSoup
import time
import tkinter as tk
import webbrowser
import random
import os
import re


def get_random_user_agent():
    user_agents = [
        'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36',
        'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.212 Safari/537.36',
        'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.82 Safari/537.36',
    ]
    return random.choice(user_agents)


def crawl_baidu(keyword, page_limit):
    headers = {
        'User-Agent': get_random_user_agent()
    }

    results = []
    for page in range(1, page_limit + 1):