python自动化测试selenium核心技术等待条件教程

from selenium import webdriver
from time import sleep
from selenium.webdriver.support.wait import WebDriverWait
from selenium.webdriver.support import expected_conditions as ec  
class TestWaitCondition(object):
    def setup(self):
        self.driver = webdriver.Chrome()
        self.driver.get("https://sahitest.com/demo/")
 
    def test_waitcondition(self):
        #点页面上的Alert Test
        self.driver.find_element_by_xpath("/html/body/table/tbody/tr/td[3]/a[1]").click()
        #鼠标点击页面中“Click For Alert”按钮
        self.driver.find_element_by_name("b1").click()
 
        wait = WebDriverWait(self.driver,2)
        #等待并判断警告框是否存在
        wait.until(ec.alert_is_present())
        #切换到alert页面
        alert = self.driver.switch_to.alert
        #获取并打印警告框中文本
        print(alert.text)
        #点弹出警告框中的确定
        alert.accept()
        self.driver.quit()