tox -e py27 出错: 'module' object has no attribute 'Cryptography_HAS_SSL_ST

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tox -e py27 出错: 'module' object has no attribute 'Cryptography_HAS_SSL_ST
1.环境
ubuntu16.04 python2.7

2.问题
执行tox -e py27命令时出错,提示"'module' object has no attribute 'Cryptography_HAS_SSL_ST"

3.解决方法

1. 进入目录: cd .tox/py27/local/lib/python2.7/site-packages
2. 删除OpenSSL: rm -rf OpenSSL/
3. 在.tox/py27/local/lib/python2.7/site-packages目录下安装pyOpenSSL: sudo python easy_install.py pyOpenSSL
   (参考: https://stackoverflow.com/questions/41102299/unable-to-install-any-pip-module-module-object-has-no-attribute-cryptography)
   4: 总结: 需要在对应的目录安装OpenSSL, 因为用pip install pyOpenSSL时总是用py35/pip 安装, 而py35已有pyOpenSSL.