如果本机安装了python2，尽量不要管他，使用python3运行python脚本就好，因为可能有程序依赖目前的python2环境，

      比如yum！！！！！

      不要动现有的python2环境！

 

      一、安装python3.6

      1. 安装依赖环境

      # yum -y install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gdbm-devel db4-devel libpcap-devel xz-devel

      2.下载Python3

      

 

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      # wget https://www.python.org/ftp/python/3.6.1/Python-3.6.1.tgz

 

      3.安装python3

      我个人习惯安装在/usr/local/python3（具体安装位置看个人喜好）

      创建目录：

 

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      # mkdir -p /usr/local/python3

 

      解压下载好的Python-3.x.x.tgz包(具体包名因你下载的Python具体版本不不同⽽而不不同，如：我下载的是Python3.6.1.那我这里就是Python-3.6.1.tgz)

 

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      # tar -zxvf Python-3.6.1.tgz

 

      4.进入解压后的目录，编译安装。

 

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      # cd Python-3.6.1

      # ./configure --prefix=/usr/local/python3

 

      make

 

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      # make

 

      make install

 

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      make install    或者 make && make install

 

      5.建立python3的软链

 

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      # ln -s /usr/local/python3/bin/python3 /usr/bin/python3

 

      6.并将/usr/local/python3/bin加入PATH

 

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      # vim ~/.bash_profile

      # .bash_profile

      # Get the aliases and functions

      if[ -f ~/.bashrc ]; then

      . ~/.bashrc

      fi

      # User specific environment and startup programs

      PATH=$PATH:$HOME/bin:/usr/local/python3/bin

      export PATH

 

      按ESC，输入:wq回车退出。

      修改完记得执行行下面的命令，让上一步的修改生效：

 

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      # source ~/.bash_profile

 

      检查Python3及pip3是否正常可用：