爬虫之selenium和webdriver—基础（三）：操作cookie和显式等待与隐式等待

 1 from selenium import webdriver
 2 
 3 driver_path = ‘D:\chromedriver\chromedriver.exe‘
 4 driver = webdriver.Chrome(executable_path=driver_path)
 5 driver.get(‘https://www.baidu.com‘)
 6 
 7 # 1、获取所有的cookie，get_cookies; 获取一个cookie，get_cookie
 8 for cookie in driver.get_cookies():
 9     print(cookie)
10     
11 # 2、根据cookie的key获取value
12 print(driver.get_cookie(‘PSTM‘))
13 
14 # 3、删除所有的cookie
15 driver.delete_all_cookies()
16 
17 # 4、删除某个cookie
18 driver.delete_cookie(‘PSTM‘)

1 from selenium import webdriver
2 
3 driver_path = ‘D:\chromedriver\chromedriver.exe‘
4 driver = webdriver.Chrome(executable_path=driver_path)
5 driver.get(‘https://www.baidu.com‘)
6 
7 driver.implicitly_wait(10)  #隐式等待，预设等待时间为10s
8 driver.find_element_by_id(‘dsfew‘) #如果10s后还没有获取到dsfew这个id，那么久抛出异常

 1 from selenium import webdriver
 2 from selenium.webdriver.support.ui import WebDriverWait
 3 from selenium.webdriver.support import expected_conditions as EC
 4 from selenium.webdriver.common.by import By
 5 
 6 driver_path = ‘D:\chromedriver\chromedriver.exe‘
 7 driver = webdriver.Chrome(executable_path=driver_path)
 8 driver.get(‘https://www.baidu.com‘)
 9 
10 # 最大等待时间为10s，如果5s时id为sdfsdf被找到，就直接返回，不会等待10s。如果10s后还没找到，就抛出异常
11 #until里面是期待的条件，也就是需要被找到的元素
12 WebDriverWait(driver,10).until(
13     EC.presence_of_element_located((By.ID,‘sdfsdf‘))
14 )