webdriver显式和隐式等待

implicitly_wait()  方法是隐式等待，用来设置超时，一般把implicitly_wait()方法调用在加载测试地址后，等待所测试的应用程序加载
webdriverwait() 是显式等待，等待的时间是固定的

from selenium.webdriver.support import expected_conditions
from selenium.webdriver.support.ui import webdriverwait
from selenium.webdriver.common.by import By
from selenium import webdriver

driver=webdriver.Chrome()
driver.maximize_window()
driver.get('https://baidu.com')
driver.implicitly_wait(30)

#元素是否出现可点 ,参数是locator
xinwei=webdriverwait(driver,5).until(expected_conditions.element_to_be_clickable((By.CSS_SELECTOR,'.mnav')))
xinwei.click()

#验证相应位置元素的文本信息,返回值是布尔  俩参数locator  text
#以验证登录的错误信息为例
driver.find_element_by_xpath(".//*[@id='u1']/a[7]").click()
driver.find_element_by_id('TangrAM__PSP_10__userName').send_keys('123')
driver.find_element_by_id('TangrAM__PSP_10__submit').click()
bo=webdriverwait(driver,5).until(expected_conditions.text_to_be_present_in_element((By.CSS_SELECTOR,'#TangrAM__PSP_10__error'),U'请您输入密码'))
print(bo)# 打印结果：True


#元素是否可见，可见后操作  参数是locator
sou=webdriverwait(driver,5).until(expected_conditions.visibility_of_element_located((By.CSS_SELECTOR,'#kw')))
sou.send_keys('java')
driver.quit()