download captcha image for training study

get_captcha_image.py

import requests
import urllib
import json
import uuid
import os


image_folder = "images"

def save_image():
    # token to download
    token_url = "https://passport.youzan.com/api/captcha/get-behavior-captcha-token.json?bizType=15"
    token = requests.get(token_url).json()['data']

    # get captcha image url
    captcha_url = "https://passport.youzan.com/api/captcha/get-behavior-captcha-data.json?token={token}&captchaType=1".format(token=token)
    big_captcha_url = requests.get(captcha_url).json()['data']['captchaObtainInfoResult']['bigUrl']


    filename = str(uuid.uuid4())
    urllib.request.urlretrieve(big_captcha_url, "{}/{}.png".format(image_folder,filename))

if __name__=="__main__":
    if not os.path.exists(image_folder):
        os.mkdir(image_folder)

    nums = 100   # how many images?
    index = 0
    while index <nums:
        save_image()
        print(index)
        index+=1