Novice python+webdriver+selenium uses unittest unit test framework and cannot switch_to.window properly

< H1 > recently, when I was learning the unittest unit test framework, I debugged the test script, and found that in this framework, the switch_to.window, could not always report an error and could not locate the element. I feel that it is because the window plum has been switched normally, and the newcomer asks for advice. Thank you. The code is as follows: < / H1 > < H1 > main.py < / H1 >
import time
import unittest
import auto_test
suite = unittest.TestSuite()
suite.addTest(auto_test.Python_autotest("get_browser"))
suite.addTest(auto_test.Python_autotest("search"))
suite.addTest(auto_test.Python_autotest("user_login"))
suite.addTest(auto_test.Python_autotest("user_logout"))
if __name__ == "__main__":
    runner = unittest.TextTestRunner()
    runner.run(suite)
< H1 > auto_test.py < / H1 >
from selenium import webdriver
import time
import unittest
class Python_autotest(unittest.TestCase):
    def setUp(self,driver = webdriver.Firefox()):
        print("Test is start")
        self.driver = driver
    def get_browser(self):
        self.driver.get("https://www.baidu.com/")
    def search(self):
        try:
            self.driver.find_element_by_xpath("//*[@id="kw"]").send_keys("segmentfault")
            self.driver.find_element_by_xpath("//*[@id="su"]").click()
        except Exception:
            print("No found everything, sorry!")
        else:
            time.sleep(1)
            self.driver.find_element_by_xpath("/html/body/div[1]/div[5]/div[1]/div[3]/div[1]/h3/a").click()
    def user_login(self):
        self.driver.switch_to.window(self.driver.window_handles[-1])
        time.sleep(3)
        self.driver.find_element_by_xpath("/html/body/div[4]/div/div/div[1]/div[2]/a[1]").click()-sharp
    def user_logout(self):
        self.driver.quit()
    def tearDown(self):
        print("Test is finish")
if __name__ == "__main__":
    unittest.main()
        
Mar.29,2021

found the cause of the error, because the execution speed is too fast, and the switch_to.window operation was performed before the second window was loaded, so the jump was not successful. Just add a time.sleep (1) to wait. Or he is too careless, the novice does not know how to solve the problem when he reports a mistake. I hope to learn from the experience and lessons in the future.

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b3f606-414cd.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3f606-414cd.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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