亚马逊爬虫-踩坑

1. 之前在window开发好好的 回到家测试用mac请求一直弹出验证码检测，
   但是此时postman请求以及浏览器均没有被检测
   怀疑是mac的python环境缺失一点东西
2. 测试良久之后用python2执行发现请求成功
   输出信息：

python  amazon_test.py 
/Users/lijiandong/Library/Python/2.7/lib/python/site-packages/urllib3/contrib/pyopenssl.py:47: 
CryptographyDeprecationWarning: Python 2 is no longer supported by the Python core team. 
Support for it is now deprecated in cryptography, and will be removed in the next release.
from cryptography import x509

3. 百度一番发现是ssl验证的问题，我的python3缺少相应的模块或者版本不一致
4. 安装 pip install cryptography==2.4.2 之后 我又可以了