import time
from pip._vendor import requests
import os

def downloads_pic():

    for i in range(0,100):
        #文件是否存在
        pic_path = 'yzmimgs/' + str(i) + '.png'
        if os.path.exists(pic_path):
            continue
        url = 'https://apply.bjhjyd.gov.cn/apply/validCodeImage.html?ee=1'
        res = requests.get(url, stream=True)

        with open(pic_path , 'wb') as f:
                    f.write(res.content)
                    f.flush()
                    print('已下载：'+pic_path)
                    time.sleep(1)


downloads_pic()