Centos7安装python3

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！

正片开始—

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

   https://www.python.org/downloads/
   # 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：
   # 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

   # cd Python-3.6.1
   # ./configure --prefix=/usr/local/python3
   # make && make install

5. 建立python3的软链

   # 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)

   到此python3就算装好了！