python自动化测试——设置元素等待

• 显式等待

　　在设置时间内，每间隔一段时间检查一次当前页面元素是否存在，如超过设置检查时间检查不到就抛出异常。

from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.support.wait import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC

driver = webdriver.Chrome()
driver.get("https://www.***.cn")

#设置最长超时时间5,检测间隔0.5
ele = WebDriverWait(driver,5,0.5).until(EC.presence_of_element_located((By.CSS_SELECTOR,"***")))

ele.send_keys("***")

driver.quit()

• 隐式等待（implicitly_wait）
  通过一定时长等待页面上某元素加载完成，默认是0，如超出了设置的时长元素还没加载完成，则抛出NoSuchElementException异常。

from selenium import webdriver
from selenium.webdriver.common.by import By

driver = webdriver.Chrome()
driver.implicitly_wait(5)
driver.get("https://www.***.cn")

driver.find_element(By.CSS_SELECTOR,"***").send_keys("***")

driver.quit()

• sleep休眠

from selenium import webdriver
from selenium.webdriver.common.by import By
from time import sleep

driver = webdriver.Chrome()
driver.get("https://www.***.cn")

sleep(5)
driver.find_element(By.CSS_SELECTOR,"***").send_keys("***")

driver.quit()