The Python code 12306 check case

import requests
from PIL import Image
import jsons

requests.packages.urllib3.disable_warnings()

headers = {
    "User-Agent": 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36'
}
session = requests.session()


# 获取验证码位置
def get_captcha_position(img_name="12303_captcha.png"):
    url = "https://kyfw.12306.cn/passport/captcha/captcha-image?login_site=E&module=login&rand=sjrand";
    try:
        response = session.get(url=url, headers=headers, verify=False)
    except ConnectionError as e:
        print(e)
    else:
        with open(img_name, "wb") as f:
            f.write(response.content)
        try:
            # 人眼查看验证码
            with Image.open(img_name) as img:
                img.show()
        except FileNotFoundError as e:
            print(e)
        the else :
             # =============================================== ======================== 
            # input picture image index number in accordance with the open identification codes, there may be a one, two, three image number, separated by a comma between the number 
            # e.g. 2,4,6, indicating the first row of the second, fourth and sixth rows of the second sheet 
            # ----------------- ---------------------- 
            #          | | | 
            #     0 | 1 | 2 | 3 
            #          | | | 
            # ----------- ---------------------------- 
            #          | | | 
            #     4 | 5 | 6 | 7 
            #          | | | 
            # ----- ---------------------------------- 
            #================================================== ===================== 
            input_index = iNPUT ( ' enter the security code location to "," split (e.g. 2,4,6): ' )
             return input_index 


# check code 
DEF check_captcha (index): 
    index_list = str (index) .split ( " , " )
     # As the official verification code 12306 is to verify the correct code coordinate range, we take the midpoint of the coordinates of each code ( Approx.) 
    img_center_position = [ ' 35, 35 ' , ' 105,35 ' , ' 175,35 ' , ' 245,35 ' , '35,105', '105,105', '175,105', '245,105']
    right_position = []
    for i in index_list:
        right_position.append(img_center_position[int(i)])
    right_position_str = ",".join(right_position)
    check_captcha_url = "https://kyfw.12306.cn/passport/captcha/captcha-check"
    data = {
        'login_site': ' E ' ,   # fixed 
        ' RAND ' : ' sjrand ' ,   # fixed 
        ' answer ' : right_position_str   # codes corresponding to the center coordinates of the string ID 
    }
     the try : 
        Response = session.post (= check_captcha_url URL, Data = Data, = headers headers, Verify = False)
     the except the ConnectionError AS E:
         Print (E)
     the else : 
        json_result = jsons.loads (response.content)
         Print (json_result)
        check_code = int (json_result [ ' RESULT_CODE ' ])
         # remove verification results, 4: 5 Success: verification fails 7: expires 
        IF check_code == 4 :
             Print (json_result [ ' result_message ' ])
             return True
         elif check_code == 5 :
             Print (json_result [ ' result_message ' ])
         the else :
             Print (json_result [ ' result_message ' ])
         return False 


DEF main ():
    img_index = get_captcha_position()
    check_captcha(img_index)


if __name__ == '__main__':
    main()

The results are shown: