使用paramiko报错：CryptographyDeprecationWarning: Support for unsafe construction of public numbers from encoded data will be removed in a future version. Please use EllipticCurvePublicKey.from_encoded_poi

1、paramiko不支持cryptography-2.6.1

pip3 uninstall cryptography==2.6.1

2、paramiko 支持cryptography-2.4.2

pip install cryptography==2.4.2