CentOS6安装Python3
笺注：如果删除了旧版本的Python2，Yum命令会无法使用，可能还会出现很多问题，所以Python3另外安装在其他目录就好了。实验中，操作系统的版本信息：
[root@centos6 ~]# cat /etc/redhat-release
CentOS release 6.9 (Final)
[root@centos6 ~]#
[root@centos6 ~]# uname -r
2.6.32-696.el6.x86_64
就算是最小化安装，CentOS6.9也是已经安装了低版本的Python2：
[root@centos6 ~]# python --version
[color=Purple]Python 2.6.6[/color]
[root@centos6 ~]#
[root@centos6 ~]# ll /usr/bin/python
[color=Purple]-rwxr-xr-x. 2 root root 4864 8月 18 2016 /usr/bin/python[/color]
[root@centos6 ~]# ll /usr/bin/python2
[color=Purple]lrwxrwxrwx. 1 root root 6 7月 5 2018 /usr/bin/python2 -> python[/color]
先安装依赖软件包：
yum -y install openssl-devel bzip2-devel expat-devel gdbm-devel readline-devel sqlite-devel wget gcc-c++ make
下载Python3的软件包：[url]https://pan.baidu.com/s/1LKMfYjiwAycZeDIFfJl6dQ[/url] 提取码：usyh
安装Python3：
tar -zxvf Python-3.6.8.tgz
mv Python-3.6.8 /usr/local/
cd /usr/local/Python-3.6.8/
./configure
make
make install
给Python3创建新链接：
[root@centos6 ~]# ln -s /usr/local/bin/python3.6 /usr/bin/python3
[root@centos6 ~]#
[root@centos6 ~]# ll /usr/bin/python3
[color=Purple]lrwxrwxrwx 1 root root 24 2月 8 11:51 /usr/bin/python3 -> /usr/local/bin/python3.6[/color]
Python2和Python3实现共存了：
[root@centos6 ~]# python --version
[color=Purple]Python 2.6.6[/color]
[root@centos6 ~]#
[root@centos6 ~]# python3 --version
[color=Purple]Python 3.6.8[/color]
测试：
[attach]19249[/attach]
[attach]19250[/attach]
######
创建Python3脚本：
[root@centos6 ~]# cat xx.py
#coding=utf-8
def func1(): #自定义函数
print('Welcome to zhuohua.') #函数的操作
if __name__ == '__main__':
func1() #执行函数
给予所有系统用户运行这个Python3脚本的权限：
[root@centos6 ~]# ll xx.py
-rw-r--r-- 1 root root 147 2月 8 12:00 xx.py
[root@centos6 ~]#
[root@centos6 ~]# chmod a+x xx.py
[root@centos6 ~]#
[root@centos6 ~]# ll xx.py
[color=Purple]-rwxr-xr-x[/color] 1 root root 147 2月 8 12:00 xx.py
[root@centos6 ~]#
运行Python3脚本：
[root@centos6 ~]# python3 xx.py
[color=Purple]Welcome to zhuohua.[/color]
[root@centos6 ~]#
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