def add_cookie(self, cookie_dict):
    """
    Adds a cookie to your current session.

    :Args:
     - cookie_dict: A dictionary object, with required keys - "name" and "value";
      optional keys - "path", "domain", "secure", "expiry"

    Usage:
      driver.add_cookie({'name' : 'foo', 'value' : 'bar'})
      driver.add_cookie({'name' : 'foo', 'value' : 'bar', 'path' : '/'})
      driver.add_cookie({'name' : 'foo', 'value' : 'bar', 'path' : '/', 'secure':True})

    """
    self.execute(Command.ADD_COOKIE, {'cookie': cookie_dict})

from selenium import webdriver

driver = webdriver.Chrome()
cookies = {'value': 'think%3A%7B%22username%210293%31628193MDAwMDAwMLOGpZaIudFqhc6Gl7LQetmZtmfOk2RhbQ%22%2C%22expire%sfdaaswMDAwMDAwMLOGud6Gqb-whbiCmLOmdZ4%22%2C%22token%22%3A%22MDAwMDAwMDAwMMurrpWavLehhs1-3LLfgduEt4OWepuo123456123KZq6HQxtOK0ZCme5p-q6iZu2yrn4uNhJ3KedDYk7ivboS4it6910926YW0%22%7D',
      'name': 'ketangpai_home_remember'}

driver.add_cookie(cookie_dict=cookies)
driver.get(https://www.ketangpai.com/Main/index.html)

Traceback (most recent call last):
 File "D:/python_workshop/python6/selenium_webdriver/add_cookies的使用(二).py", line 9, in <module>
  driver.add_cookie(cookie_dict=cookies)
 File "D:\Program\python34\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 872, in add_cookie
  self.execute(Command.ADD_COOKIE, {'cookie': cookie_dict})
 File "D:\Program\python34\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 312, in execute
  self.error_handler.check_response(response)
 File "D:\Program\python34\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 242, in check_response
  raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.WebDriverException: Message: unable to set cookie
 (Session info: chrome=66.0.3359.139)
 (Driver info: chromedriver=2.35.528161 (5b82f2d2aae0ca24b877009200ced9065a772e73),platform=Windows NT 6.1.7600 x86_64)

from selenium import webdriver

driver = webdriver.Chrome()
cookies = {'value': 'think%3A%7B%22username%210293%31628193MDAwMDAwMLOGpZaIudFqhc6Gl7LQetmZtmfOk2RhbQ%22%2C%22expire%sfdaaswMDAwMDAwMLOGud6Gqb-whbiCmLOmdZ4%22%2C%22token%22%3A%22MDAwMDAwMDAwMMurrpWavLehhs1-3LLfgduEt4OWepuo123456123KZq6HQxtOK0ZCme5p-q6iZu2yrn4uNhJ3KedDYk7ivboS4it6910926YW0%22%7D',
      'name': 'ketangpai_home_remember'}

driver.get("https://www.ketangpai.com/User/login.html")
driver.add_cookie(cookie_dict=cookies)
driver.get(https://www.ketangpai.com/Main/index.html)

from selenium import webdriver
import time

#driver1登录网站，获得cookie并保存
driver1 = webdriver.Chrome()
driver1.get("https://www.ketangpai.com/User/login.html")
driver1.maximize_window()
time.sleep(2)

#第一次通过send_keys向输入框发送用户名密码登录
driver1.find_element_by_xpath("//input[@name='account']").send_keys("your username")
driver1.find_element_by_xpath("//input[@name='pass']").send_keys("your password")
time.sleep(2)
driver1.find_element_by_xpath("//div[@class='padding-cont pt-login']//a[@class='auto-login fl']").click()
time.sleep(3)
driver1.find_element_by_xpath("//div[@class='padding-cont pt-login']//a[@class='btn-btn']").click()
time.sleep(6)
#用get_cookies的方法得到登录后的cookie，这个cookie是个列表，列表中两个元素都是字典，第一个是登录前的cookie，第二个是登录后的cookie
#将cookie保存在变量savedCookies中
savedCookies = driver1.get_cookies()
print(savedCookies)

#driver2得到driver1的cookie,先删除自己的所有cookie,再将driver1的cookie添加进来
driver2 = webdriver.Chrome()
#必须首先加载网站，这样selenium才知道cookie是属于哪个网站的
driver2.get("https://www.ketangpai.com/User/login.html")
#一旦加载网站，即使没登录，也会产生一个cookie，所以这个cookie被删除了
driver2.delete_all_cookies()
#遍历savedCookies中的两个元素
for cookie in savedCookies:
  #k代表着add_cookie的参数cookie_dict中的键名，这次我们要传入这5个键
  for k in {'name', 'value', 'domain', 'path', 'expiry'}:
    #cookie.keys()属于'dict_keys'类，通过list将它转化为列表
    if k not in list(cookie.keys()):
      #saveCookies中的第一个元素，由于记录的是登录前的状态，所以它没有'expiry'的键名，我们给它增加
      if k == 'expiry':
        t = time.time()
        cookie[k] = int(t)  #时间戳s
  #将每一次遍历的cookie中的这五个键名和键值添加到cookie
  driver2.add_cookie({k: cookie[k] for k in {'name', 'value', 'domain', 'path', 'expiry'}})

#加载我们想要看到的页面的url
driver2.get("https://www.ketangpai.com/Main/index.html")
#再次打印driver2的cookie
print(driver2.get_cookies())