老师，爬取51job网站python岗位信息，不会做，可以给正确答案吗

同学，你好！同学作业修改后的代码如下：

import time
from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.common.keys import Keys
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
from selenium.common.exceptions import TimeoutException, NoSuchElementException


class Job51Crawler:
    def __init__(self):
        self.driver = webdriver.Chrome()
        self.wait = WebDriverWait(self.driver, 10)
        self.base_url = "https://search.51job.com/list/000000,000000,0000,00,9,99,+,2,1.html"
        self.jobs_data = []

    def search_jobs(self):
        """打开网站并搜索Python工程师岗位"""
        # try:
        self.driver.get(self.base_url)
        # 等待搜索框加载完成
        # search_input = self.wait.until(
        #     EC.presence_of_element_located((By.ID, "kwdselectid"))
        # )
        search_input = self.wait.until(
            EC.presence_of_element_located((By.ID, "keywordInput"))
        )
        # 输入搜索关键词
        # search_input.clear()
        search_input.send_keys("python工程师")
        # search_input.send_keys(Keys.RETURN)
         # 点击搜索按钮
        time.sleep(5)
        search_btn = self.wait.until(
            EC.element_to_be_clickable((By.ID, "search_btn"))
        )
        search_btn.click()
        # 等待搜索结果加载
        time.sleep(5)
        self.parse_pages()

        # except Exception as e:
        #     print(f"搜索过程中出现错误: {e}")

    def parse_pages(self):
        """解析所有页面的数据"""
        page_num = 1
        while True:
            print(f"正在爬取第 {page_num} 页...")
            try:
                self.wait.until(
                    # EC.presence_of_element_located((By.CLASS_NAME, "j_joblist"))
                    EC.presence_of_element_located((By.CLASS_NAME, "joblist"))
                )
            except TimeoutException:
                print("等待职位列表超时")
                break

            # 获取当前页面的HTML内容
            content = self.driver.page_source
            self.parse_html(content)

            # 尝试翻页
            try:
                #next_page_btn = self.driver.find_element(By.CLASS_NAME, "next")
                next_page_btn = self.driver.find_element(By.CLASS_NAME, "btn-next")
                if "disable" in next_page_btn.get_attribute("class"):
                   
                    print("已到达最后一页")
                    break

                next_page_btn.click()
                page_num += 1
            # 等待页面加载
                time.sleep(3)
            except (NoSuchElementException, TimeoutException):
                print("无法找到下一页按钮或已到达最后一页")
                break

    def parse_html(self, content):
        """解析HTML内容，提取职位信息"""

        # 这里使用driver直接查找元素，因为我们已经等待页面加载完成
        try:
            #job_items = self.driver.find_elements(By.CLASS_NAME, "j_joblist")[0].find_elements(By.CLASS_NAME, "j_job")
            job_items = self.driver.find_elements(By.CLASS_NAME, "joblist-item-job-wrapper")

            for job_item in job_items:

                job_name = job_item.find_element(By.CLASS_NAME, "jname").text.strip() or  "暂无数据"
           
                # # 提取薪资
                try:
                    salary = job_item.find_element(By.CLASS_NAME, "sal").text.strip()
                except NoSuchElementException:
                    salary = "暂无数据"

                # # 提取工作地点和要求
                try:
                    job_info = job_item.find_element(By.CLASS_NAME, "shrink-0").text.strip()
                except NoSuchElementException:
                    job_info = "暂无数据"

                # # 提取福利待遇
                try:
                    benefits = job_item.find_element(By.CLASS_NAME, "tags").text.strip()
                except NoSuchElementException:
                    benefits = "暂无数据"

                # # 保存数据
                job_data = {
                    "岗位名称": job_name,
                    "薪资": salary,
                    "工作信息": job_info,
                    "福利待遇": benefits
                }

                self.jobs_data.append(job_data)


        except Exception as e:
            print(f"解析页面时出错: {e}")

    def save_to_file(self):
        """将数据保存到本地文件"""
        try:
            with open("a.txt", "w", encoding="utf-8") as f:
                for i, job in enumerate(self.jobs_data, 1):
                    f.write(f"职位 {i}:\n")
                    f.write(f"  岗位名称: {job['岗位名称']}\n")
                    f.write(f"  薪资: {job['薪资']}\n")
                    f.write(f"  工作信息: {job['工作信息']}\n")
                    f.write(f"  福利待遇: {job['福利待遇']}\n")
                    f.write("\n")

            print(f"成功保存 {len(self.jobs_data)} 条职位信息到 a.txt")

        except Exception as e:
            print(f"保存文件时出错: {e}")

    def run(self):
        """运行爬虫"""
        try:
            self.search_jobs()
            self.save_to_file()
        finally:
            self.driver.quit()


if __name__ == "__main__":
    crawler = Job51Crawler()
    crawler.run()

祝学习愉快~