续签Let's Encrypt证书从来没有成功过

1. /usr/lib64/python2.7/site-packages/cryptography/__init__.py:39: 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 a future release.
   
2.   CryptographyDeprecationWarning,

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简直服了，手动续签可以，自动就不行。难道两个地方用的不是同一套代码？
网上那些教程说改脚本，问题改了以后不升级了吗。。。。