python selenium爬取斗鱼

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不加延迟报错selenium.common.exceptions.NoSuchElementException: Message: no such element: Unable to locate element: {"method":"xpath","selector":".//span[@class="DyListCover-hot"]"}
(Session info: chrome=80.0.3987.122)

最开始以为是版本问题，不过应该不会，我检查了下版本

然后我注释掉这一段

然后报Message: stale element reference: element is not attached to the page document

但是却爬取到一段消息

说明有可能是延时的问题，在开头加上延时，成功解决

附上源码 import json import time

from selenium import webdriver

driver=webdriver.Chrome()

driver.get("https://www.douyu.com/directory/all")
****# driver.close()****
#

def douyu():
    ##要加延迟，不然要报错
    time.sleep(5)
    li_list=driver.find_elements_by_xpath('//*[@id="listAll"]/section[2]/div[2]/ul/li')
    # print(list_all)

    content_dict={}
    for li in li_list:
        content_dict["title"]=li.find_element_by_xpath(".//h3").text
        content_dict["belong"]=li.find_element_by_xpath('.//span[@class="DyListCover-zone"]').text
        content_dict["watch_num"]=li.find_element_by_xpath('.//span[@class="DyListCover-hot"]').text
        content_dict["author"] = li.find_element_by_xpath(".//h2").text
        print(content_dict)
        #将字典转换为字符串便于存储
        s=json.dumps(content_dict,ensure_ascii=False)  #json序列化默认对中文采用ascii编码，所以False
        with open("douyu.txt","a",encoding="utf-8") as f:
            f.write(s+'\n')
    next_url=driver.find_elements_by_xpath('//li[@title="下一页"]/span[@class="dy-Pagination-item-custom"]')
    #三元表达式
    next_url=next_url[0] if len(next_url) > 0 else None
    while next_url is not None:
        next_url.click()
        time.sleep(3)
        #我调我自己 点击下一页停5s继续爬取 延时设在开头
        douyu()

douyu()