这应该会对您有所帮助：

from selenium import webdriver
import copy
import threading

global driver

def retrieve_urls():    

    threading.Timer(30, retrieve_urls).start() #Repeats the task every 30 seconds

    driver.get('webpage url') #Enter the url of the webpage here

    urls = driver.find_elements_by_class_name('pull-left epnlink')

    url_list = []

    for element in urls:
        url_list.append(element.get_attribute('href'))

    path = "Urls.txt" #Enter the path of the text file here

    f = open(path,'r')

    txt = f.readlines()

    f.close()

    for x in range(len(txt)):
        txt[x] = txt[x].strip()

    final_txt = ""

    f = open(path,'w')

    dup = copy.deepcopy(url_list)

    for x in dup:
        if x not in txt:
            final_txt += x + "\n"
            url_list.remove(x)

    for x in url_list:
        final_txt += x + "\n"

    f.write(final_txt)        

    f.close()

driver = webdriver.Chrome()

retrieve_urls()

如果你有任何错误，请让我知道。这可能是因为我没有测试我的程序(因为我在这个网站上没有帐户)。但我希望这会奏效。