Python 安装pybloomfilter 问题解决

报错信息：

Requirement already satisfied: pyopenssl in /usr/lib/python2.7/dist-packages/usr/local/lib/python2.7/dist-packages/pip/_vendor/requests/packages/urllib3/util/ssl_.py:318: SNIMissingWarning: An HTTPS request has been made, 

but the SNI (Subject Name Indication) extension to TLS is not available on this platform. 

This may cause the server to present an incorrect TLS certificate, which can cause validation failures.

 You can upgrade to a newer version of Python to solve this. 

For more information, see https://urllib3.readthedocs.io/en/latest/security.html#snimissingwarning.

造成这样的原因是因为缺少ssl的库导致的，因此我们给它装上：

sudo apt-get install libffi-dev libssl-dev

sudo pip install pyopenssl ndg-httpsclient pyasn1

然后就可以了