12306模拟登陆

1.本来想写一个自动抢票的脚本，但是在预订时，有一个参数不知道如何构造，因而只能半途而废，在网上查了很久，发现都是用一些自动化测试工具（selenium，Splinter）写的。

下面贴一下我的前面的代码

 1 # coding = utf-8
 2 from urllib.parse import urlencode
 3 
 4 import requests
 5 from .settings import username, password, get_answer
 6 session = requests.Session()
 7 # 1.获取cookie
 8 start_url = "https://kyfw.12306.cn/otn/login/init"
 9 session.get(start_url)
10 # 2.获取验证码
11 captcha_url = "https://kyfw.12306.cn/passport/captcha/captcha-image?login_site=E&module=login&rand=sjrand&0.11248564942476502"
12 response = session.get(captcha_url)
13 with open('captcha.png', 'wb') as fp:
14     fp.write(response.content)
15 # 3.校验验证码
16 check_captcha_url = "https://kyfw.12306.cn/passport/captcha/captcha-check"
17 data = {
18     "answer": get_answer(),
19     "login_site": "E",
20     "rand": "sjrand"
21 }
22 response = session.post(check_captcha_url, data=data)
23 print(response.text)
24 # 4.校验用户名和密码
25 login_url = "https://kyfw.12306.cn/passport/web/login"
26 data = {
27     "username": username,
28     "password": password,
29     "appid": "otn"
30 }
31 response = session.post(login_url, data=data)
32 print(response.text)
33 # 5.查询车票
34 base_select_url = "https://kyfw.12306.cn/otn/leftTicket/query?"
35 params = {
36     "leftTicketDTO.train_date": "",
37     "leftTicketDTO.from_station": "",
38     "leftTicketDTO.to_station": "",
39     "purpose_codes=ADULT": ""
40 }
41 select_url = base_select_url + urlencode(params)
42 session.get(select_url)
43 "secretStr=BgGg3ahcOjLqIBDMSHMPMAZRSRIGj%2FKUMlb0d5D6Jf3XcC1FrHl3iW30%2FMelzJ0DX4WhejtUM9yH%0AdmgLn6X6nIC8LWdoTjml6ZuXtQeCDOhBRfhml2ePFiGYHZdZ1m5CzXy9h34OdONVz6K%2FqIBnvkhd%0AGEq0lsFEZ8gd0nEAEEmGeeh3gGQo58Fw%2FRKHAQeVMUtdq9vfM3TJ4exOw9glQh1JgfPJVIo%2FADlh%0Av1d4kUcgRnDZqTCltaGG9GmC9eAF3dyY66VojPI%3D&train_date=2018-08-10&\
44 back_train_date=2018-07-26&\
45 tour_flag=dc&purpose_codes=ADULT&\
46 query_from_station_name=XFN&\
47 query_to_station_name=WHN&\
48 undefined"