日期：2017-11-30
今天打算把Python2.7升级到Python3.6，就重新安装了Python3.6，发现Django模块等还得重新安装。
Python3.6自带pip模块
于是安装Django：
python3 -m pip install django
结果~报错了：
Collecting django
Could not fetch URL https://pypi.python.org/simple/django/: There was a problem confirming the ssl certificate: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:777) - skipping
解决方案：
增加 --trusted-host
python3 -m pip install --trusted-host pypi.python.org django
成功
