【问题描述】 运行一段含有AES加解密的代码，总是有warning提示出现，如下： D:\Python38\lib\site-packages\cryptography\hazmat\backends\openssl\x509.py:14: CryptographyDeprecationWarning: This version of cryptography contains a tempo

原因：版本太低，安装就好了。 ERROR: pyopenssl 19.0.0 has requirement cryptography>=2.3, but you'll have cryptography 2.1.4 which is incompatible.Installing collected packages: ldap3, hyperframe, click, zstanda