分析请求，发现验证码图片在某个POST请求中

那么：

import requests
import ddddocr
res = requests.post(url="https://api.ruanwen.la/api/auth/captcha/generate")
res_dict = res.json()
captcha_token = res_dict['data']['captcha_token']
captcha_src = res_dict['data']['src']
res = requests.get(url=captcha_src)
with open('xx.png',mode='wb') as f:
    f.write(res.content)

如果发现xx.png成功下载到验证码图片，则这一步成功