zx火车票App数据分析问题

[zaaserz]

由于近段时间发现zx取消了先抢票再付款模式,又不想绑定支付宝的免密支付所以突生想法自己做个小爬虫去获取火车票信息,然后就用fildder抓取手机数据包
经过反复调试发现zx车票的数据来源为
https://mobile.12306.cn/otsmobile/app/mgs/mgw.htm?operationType=com.cars.otsmobile.queryLeftTicket&requestData=%5B%7B%22train_date%22%3A%2220190521%22%2C%22purpose_codes%22%3A%2200%22%2C%22from_station%22%3A%22TJP%22%2C%22to_station%22%3A%22GZQ%22%2C%22station_train_code%22%3A%22%22%2C%22start_time_begin%22%3A%220000%22%2C%22start_time_end%22%3A%222400%22%2C%22train_headers%22%3A%22QB%23%22%2C%22train_flag%22%3A%22%22%2C%22seat_type%22%3A%220%22%2C%22seatBack_Type%22%3A%22%22%2C%22ticket_num%22%3A%22%22%2C%22dfpStr%22%3A%22%22%2C%22baseDTO%22%3A%7B%22os_type%22%3A%22a%22%2C%22device_no%22%3A%22CAMyh7hkKH2RI3MH9NqaWQvk%22%2C%22mobile_no%22%3A%22%22%2C%22time_str%22%3A%2220190429122310%22%2C%22check_code%22%3A%2250b9e3199ad12e503759471b0fd880b8%22%2C%22version_no%22%3A%223.0.1.01221000%22%2C%22user_name%22%3A%22%22%7D%7D%5D&ts=1556511790364&sign=4e27116da8d7de16898dc6bc8552c03d
返回的数据包为:

"arrive_time": "05:04",
"controlled_train_flag": "0",
"controlled_train_message": "正常车次，不受控",
"day_difference": "1",
"end_station_telecode": "SEQ",
"exchange_train_flag": "0",
"from_station_name": "天津",
"from_station_telecode": "TJP",
"houbu_train_flag": "0",
"is_support_card": "0",
"lishi": "26:09",
"location_code": "T3#MjAxOTA1MjEjMDAjWjM4NCMyNjowOSMwMjo1NSMxMTAwMDBaMzg0MDgjVEpQI0daUSMwNTowNCPlpKnmtKUj5bm/5beeIzA4IzIwI2J2Z290VkoyVHM3YVIzNHU0ZmJZNTBNWWR4Rlg1VGZXMWUwOE9oVnJMR1l5eTZsWksyQnlRZmtVRjlrPSNUMyMwIzI5IzEzMzAjMiMwNSMwMTEwIzE4IzI1MDkjMCMxNTU2NTEyNDA1NDE1IzE1NTY1MTMyOTQxODYjMTU1NTkxMTAwMDAwMCMyMDE5MDUyMCNDQ1QjU0VRIzAjNzUyMTQzQzlENUVGMjMyREM3NkYwNjExNEUzRTA3RTY5QzYwRDUyNENFRjZERDc4OEZFM0IzOTk=",
"message": "",
"start_station_telecode": "CCT",
"start_time": "02:55",
"start_train_date": "20190520",
"station_train_code": "Z384",
"to_station_name": "广州",
"to_station_telecode": "GZQ",
"train_no": "110000Z38408",
"yp_ex": "10401030",
"yp_info": "bvgotVJ2Ts7aR34u4fbY50MYdxFX5TfW1e08OhVrLGYyy6lZK2ByQfkUF9k=",
"yp_info_cover": "1026853062407915000110268500013045550000",
"yp_info_coverFlag": "1"
这是一个车次的信息里面有时间与车站等,但是没有我想要座位信息,哪位大神能帮忙看下?