Python-沃尔玛的类别名称Web抓取

我想从这个沃尔玛找到部门名称 link .你可以看到,首先,里面左边有7个部门 Departments (巧克力饼干、饼干、黄油饼干等)。当我点击 See All Departments ,增加了9个类别,因此现在的数字是16。我正试图让所有16个部门都自动。我写了这段代码;

from selenium import webdriver

n_links = []

driver = webdriver.Chrome(executable_path='D:/Desktop/demo/chromedriver.exe')
url = "https://www.walmart.com/browse/snacks-cookies-chips/cookies/976759_976787_1001391" 
driver.get(url)

search = driver.find_element_by_xpath("//*[@id='Departments']/div/div/ul").text
driver.find_element_by_xpath("//*[@id='Departments']/div/div/button/span").click()
search2 = driver.find_element_by_xpath("//*[@id='Departments']/div/div/div/div").text

sep = search.split('\n')
sep2 = search2.split('\n')

lngth = len(sep)
lngth2 = len(sep2)

for i in range (1,lngth):
    path = "//*[@id='Departments']/div/div/ul/li"+"["+ str(i) + "]/a"
    nav_links = driver.find_element_by_xpath(path).get_attribute('href')
    n_links.append(nav_links)
    
for i in range (1,lngth2):
    path = "//*[@id='Departments']/div/div/div/div/ul/li"+"["+ str(i) + "]/a"
    nav_links2 = driver.find_element_by_xpath(path).get_attribute('href')
    n_links.append(nav_links2)   
    
print(n_links)
print(len(n_links))

最后,当我运行代码时,我可以看到里面的链接 n_links 大堆但问题是;有时有13个链接,有时有14个。应该是16岁,我还没见过16岁,只有13或14岁。我试图补充 time.sleep(3) 之前 search2 线路,但不起作用。你能帮助我吗?