通过离线安装包解决了 from cryptography.hazmat.bindings._openssl import ffi, lib ImportError: /usr/local/python36/lib/python3.6/site-packages/cryptography-2.2.2-py3.6-linux-x86

场景：内网服务器不能上外网（代理也不通！），

之前安装了PYTHON的几个安装包，但不是知道为什么无法使用PARAMIKO这个模块

在导入 from cryptography.hazmat.bindings._openssl import ffi, lib 的时候会

报错：

from cryptography.hazmat.bindings._openssl import ffi, lib
ImportError: /usr/local/python36/lib/python3.6/site-packages/cryptography-2.2.2-py3.6-linux-x86_64.egg/cryptography/hazmat/bindings/_openssl.abi3.so: undefined symbol: d2i_DHxparams

找了好多资料都没有解决，没办法只好放弃原有的安装方式，之前是一个个手动下载模块，传到内网服务器后通过PYTHON SETUP.PY INSTALL 安装。

现在打算在外网通过PIP 下载模块，再打包到内网服务器，然后利用pip安装，这样可以避免模块之间依赖的问题

注：以下步骤是安装单个包的，下例子以安装paramiko包（较多依赖）说明

步骤说明：

1、使用pip download 命令下载wheel文件至下载目录~/pippackage目录下

pip install paramiko --download ~/pippackage/
或者
[root@master pippackage]# pip download paramiko --src ./

[djuser@localhost ~]$ mkvirtualenv py3test

New python executable in /home/djuser/.virtualenvs/py3test/bin/python2

Also creating executable in /home/djuser/.virtualenvs/py3test/bin/python

Installing setuptools, pip, wheel...done.

virtualenvwrapper.user_scripts creating /home/djuser/.virtualenvs/py3test/bin/predeactivate

virtualenvwrapper.user_scripts creating /home/djuser/.virtualenvs/py3test/bin/postdeactivate

virtualenvwrapper.user_scripts creating /home/djuser/.virtualenvs/py3test/bin/preactivate

virtualenvwrapper.user_scripts creating /home/djuser/.virtualenvs/py3test/bin/postactivate

virtualenvwrapper.user_scripts creating /home/djuser/.virtualenvs/py3test/bin/get_env_details

(py3test) [djuser@localhost ~]$ lssitepackages

easy_install.py pip pkg_resources setuptools-40.0.0.dist-info wheel-0.31.1.dist-info

easy_install.pyc pip-10.0.1.dist-info setuptools wheel

(py3test) [djuser@localhost ~]$ mkdir pippackage

(py3test) [djuser@localhost ~]$ pip installl paramiko --download ~/pippackage/

ERROR: unknown command "installl" - maybe you meant "install"

(py3test) [djuser@localhost ~]$ pip install paramiko --download ~/pippackage/

Usage:

pip install [options] <requirement specifier> [package-index-options] ...

pip install [options] -r <requirements file> [package-index-options] ...

pip install [options] [-e] <vcs project url> ...

pip install [options] [-e] <local project path> ...

pip install [options] <archive url/path> ...

no such option: --download

(py3test) [djuser@localhost ~]$ pip3 install paramiko --download ~/pippackage/

DEPRECATION: pip install --download has been deprecated and will be removed in the future. Pip now has a download command that should be used instead.

Collecting paramiko