win（py36.32）上安装报错：

no module named _cffi_backend

解决方法是 卸载paramiko 卸载pycparser 卸载cffi

重新安装 paramiko即可

ubuntu(py35)报错：

build/temp.linux-x86_64-3.5/_openssl.c:498:30: fatal error: openssl/opensslv.h: No such file or directory

compilation terminated.

error: command ‘x86_64-linux-gnu-gcc’ failed with exit status 1

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Command “/usr/bin/python3 -u -c “import setuptools, tokenize;__file__=’/tmp/pip-build-d859d7ra/cryptography/setup.py’;exec(compile(getattr(tokenize, ‘open’, open)(__file__).read().replace(‘\r\n’, ‘\n’), __file__, ‘exec’))” install –record /tmp/pip-x_urmp5l-record/install-record.txt –single-version-externally-managed –compile” failed with error code 1 in /tmp/pip-build-d859d7ra/cryptography/

解决方法是安装apt-get install libssl-dev

重新安装paramiko即可