Ubuntu 将默认的Python2.7 更改成3.6 而且pip3 与3.6相关

安装Python3.6 sudo apt-get install software-properties-common sudo add-apt-repository ppa:jonathonf/python-3.6 #添加源 sudo apt-get update sudo apt-get install python3.6 修改路径，默认python3.6 cd /user/bin rm

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