最近在Ubuntu16.04上安装Python3.6之后，使用pip命令出现了问题，提示说找不到ssl模块，出现错误如下：
pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.
Could not fetch URL https:*******: There was a problem confirming the ssl certifi
在安装mahotas软件包时使用命令：
pip3 install mahotas
但是终端中报了一大段错，看的我头皮发麻：
Building wheel for mahotas (setup.py) ... error
ERROR: Command errored out with exit status 1:
command: /home/yuzhe/.virtualenvs/py36env/bin/python -u -c 'import sys, setuptools, tok
