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

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

3.安装python3

　　个人习惯而定，假设安装在/usr/local/python3

　　创建目录：

    # 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)

    # tar -zxvf Python-3.6.1.tgz

4.进入解压后的目录，编译安装。（编译安装前需要安装编译器yum install gcc）

    # cd Python-3.6.1

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

    # make

    # make install

5.建立python3的软链接

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

6.并将/usr/local/python3/bin加入PATH

    # 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：

    # source ~/.bash_profile

　　检查Python3及pip3是否正常可用：

    # python3 -V

    Python 3.6.1

    # pip3 -V

    pip 9.0.1 from /usr/local/python3/lib/python3.6/site-packages (python 3.6)

7.不行的话尝试创建一下pip3的软链接

    # ln -s /usr/local/python3/bin/pip3 /usr/bin/pip3