centos装python3

1、检查python版本

   [root@bogon ~]# python -V
   Python 2.7.5
   [root@bogon ~]#

2、安装必要的库文件

yum -y install zlib zlib-devel gcc
很重要，要不装不了包
yum install openssl-devel -y

3、下载python3.6.1到/usr/local目录

wget https://www.python.org/ftp/python/3.6.1/Python-3.6.1.tar.xz

4、解压安装

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

5、永久添加环境变量

  #vim/etc/profile
 添加export PATH="\$PATH:/usr/local/python3/bin"
添加完成后 source /etc/profile
**临时添加环境变量为 # export         PATH="$PATH:/usr/local/python3/bin" 终端结束后环境变量生效

6、打开python3.6

[root@bogon ~]# python3
Python 3.6.1 (default, May 19 2017, 04:11:00)
[GCC 4.8.5 20150623 (Red Hat 4.8.5-11)] on linux
Type "help", "copyright", "credits" or "license" for more information.

7、修改/usr/bin/python链接

　　# cd/usr/bin
　　# mv python python.bak
　　# ln -s /usr/local/python3/bin/python3.6 /usr/bin/python
　　# ln -s /usr/local/python3/bin/python3.6 /usr/bin/python3
　　修改后可直接用 # python打开python3