import requests
 
trainsUrl ='http://XXX.com/trains'
headers = {
  "Content-Type":"application/json;charset=UTF-8",
}
cookies = {
  "XXXthor":"XXXXXX105a42"
}
prames = {
  'depId':'1',
  'arrId':'2',
  'goDate':'XXXX'
}
res = requests.get(url=trainsUrl, cookies=cookies, params=prames, headers=headers).json()

import requests
 
loginUrl ="http://XXX.com/login"
data1 = {
  "userName":"157XXXX",
  "userPwd":"XXXX"
}
headers = {
  "Content-Type":"application/json;charset=UTF-8"
}
#運行登錄接口
loginRes = requests.post(url=loginUrl, json=data1, headers=headers)
trainsUrl ='http://XXX.com/trains'
parames = {
  'depId':'1',
  'arrId':'2',
  'goDate':'1538100286000'
}
#運行trainsUrl接口時，從loginRes中獲取cookies
res = requests.get(url=trainsUrl, params=parames, cookies=loginRes.cookies).json()

import requests
 
# Session 會話對象
# 會話對象讓你能夠跨請求保持某些參數(shù)。它也會在同一個 Session 實例發(fā)出的所有請求之間保持 cookie
# 會話對象具有主要的 Requests API 的所有方法。你可以當成 Request去使用
sessionRequest = requests.session() #實例化會話對象
loginUrl ="http://XXX.com/login"
data = {
  "userName":"157XXXX",
  "userPwd":"XXX"
}
headers = {
  "Content-Type":"application/json;charset=UTF-8"
}
#第二次請求的url
trainsUrl ='http://XXX/trains'
parames = {
  'depId':'1',
  'arrId':'2',
  'goDate':'XXXXX'
}
#登錄
resp = sessionRequest.post(url=loginUrl , json=data, headers=headers)
#請求trains接口
trainsResp = sessionRequest.get(url=trainsUrl, params=parames)