无法在另一个类方法Python中调用类方法

Question

我对class方法（）有一个问题，我该如何解决它

这是我的代码：

import unittest
from selenium import webdriver

class HomePageTest(unittest.TestCase):
    @classmethod
    def setUpclass(cls):
        #create a new Chrome session
        cls.driver = webdriver.Chrome()
        cls.driver.implicty_wait(10)
        cls.driver.maximize_window()

        #navigate to the homepage
        cls.driver.get("http://demo.magentocommerce.com/")

    def test_search_text_field_max_length(self):
        #get the search textbox
        search_field = self.driver.find_element_by_id("search")

        #check maxlength attribute is set to 128
        self.assertEqual("128", search_field.get_attribute("maxlength"))

    def test_search_button_enabled(self):
        #get Search Button
        search_button = self.driver.find_element_by_class_name("button")

        #check search button is enabled
        self.asserTrue(search_button.is_enabled())

    def test_my_account_link_is_displayed(self):

        #get the account link
        account_link = self.driver.find_element_by_link_text("Account")

        #check My Account link is displayed/visible in the home page footer
        self.assertTrue(account_link.is_displayed())

    def test_account_links(self):
        #get the all the links with account text in it
        account_links = self.driver.find_elements_by_partial_link_text("ACCOUNT")

        #check account and my account link is displayed/visible in the home page footer
        self.assertTrue(2, len(account_links))

    def test_count_of_promo_banners_images(self):
        #get promo banner list
        banner_list = self.driver.find_elements_by_class_name("promos")

        #get images from the banner_list
        banners = banners_list.find_elements_by_tag_name("img")

        #check there are 3 banners displayed on the page
        self.assertEqual(2, len(banners))

    def test_vip_promo(self):
        #get vip promo image
        vip_promo = self.driver.find_element_by_xpath("//img[@alt='Shop Private Sales - Member Only']")

        #check vip promo logo is displayed on home page
        self.asserTrue(vip_promo.is_displayed())
        #click on vip promo images to open the page
        bip_promo.click()
        #check page title
        self.assertEqual("VIP", self.driver.title)

    def test_shopping_cart_status(self):
        #check content of my shopping cart block on home page
        #get the Shopping cart icon and click to open the shopping cart section
        shopping_cart_icon = self.driver.find_find_element_by_css_selector("div.header-minicart span.icon")
        shopping_cart_icon.click()

        #get the shopping cart status
        shopping_cart_status = self.driver.find_element_by_css-selector("p.empty").text
        self.assertEqual("You have no items in your shopping cart.", shopping_cart_status)
        
        #close the shopping cart section
        close_button = self.driver.find_element_by_css_selector("div.minicart-wrapper a.close")
        close_button.click()
        
   @classmethod # in this area red why?
   def tearDownClass(cls) :
       #close the browser window
       cls.driver.quit()

if_name_ == '_main_':
    unittest.main(verbosity=2)