selenium三种等待方式：剖析原理/用法和应用场景

1.第一种等待：time.sleep (固定等待)
2.第二种等待：impli’citly_wait(隐式等待)

3.第三种等待 WebDriverWait(显式等待)

示例：

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 testcase:
    def __init__(self):
        self.driver=webdriver.Chrome()
        self.driver.get("http://www.baidu.com")

    def test_sleep(self):
        """第一种睡眠方式sleep"""
        self.driver.find_element_by_id('kw').send_keys('selenium')
        sleep(4) #固定等待 就是进程阻塞
        self.driver.find_element_by_id('su').click()
        sleep(2)
        self.driver.quit()

    def test_implicitly(self):
        """隐式等待"""
        self.driver.implicitly_wait(10)
        self.driver.find_element_by_id('kw').send_keys('selenium')
        self.driver.find_element_by_id('su').click()
        self.driver.quit()

    def test_wait(self):
        """显示等待 最常用"""
        wait=WebDriverWait(self.driver,2)
        wait.until(EC.title_is('百度一下，你就知道')) #判断出出现这个时执行下面的语句
        self.driver.find_element_by_id('kw').send_keys('selenium')
        self.driver.find_element_by_id('su').click()
        self.driver.quit()


if __name__ == '__main__':
    case=testcase()
    #case.test_sleep()
    #case.test_implicitly()
    case.test_wait()