centos7升级python_centos7下将Python2.7.5升级到Python3.6.1以及还原

安装相关的软件包 避免出现编译出错，无法编译，升级之后无法使用等情况

[root@yuhai ~]# yum install -y zlib* readline* gcc*

#过程忽略

从Python官网下载python3.6.1的安装包

[root@yuhai ~]# wget https://www.python.org/ftp/python/3.6.1/Python-3.6.1.tgz

--2017-03-22 22:04:24-- https://www.python.org/ftp/python/3.6.1/Python-3.6.1.tgz

Resolving www.python.org (www.python.org)... 151.101.72.223, 2a04:4e42:11::223

Connecting to www.python.org (www.python.org)|151.101.72.223|:443... connected.

HTTP request sent, awaiting response... 200 OK

Length: 22540566 (21M) [application/octet-stream]

Saving to: ‘Python-3.6.1.tgz’

100%[====================================================================>] 22,540,566 33.4KB/s in 12m 14s

2017-03-22 22:16:40 (30.0 KB/s) - ‘Python-3.6.1.tgz’ saved [22540566/22540566]

[root@yuhai ~]# ls

anaconda-ks.cfg Python-3.6.1.tgz

解压安装包

[root@yuhai ~]# tar xf Python-3.6.1.tgz #解压安装包

[root@yuhai ~]# ls

anaconda-ks.cfg Python-3.6.1 Python-3.6.1.tgz

进入目录并编译在/user/local/python3.6下

[root@localhost ~]# cd Python-3.6.1

[root@yuhai Python-3.6.1]# mkdir /usr/local/python3.6

[root@yuhai Python-3.6.1]# ./configure --prefix=/usr/local/python3.6

过程省略

[root@yuhai Python-3.6.1]# make

过程省略

[root@yuhai Python-3.6.1]# make install

过程省略

备份原本的python2.7.5

[root@yuhai Python-3.6.1]# mv /usr/bin/python /usr/bin/python_2.7.5

把编译出来的Python3.6.1的命令创建软连接到/usr/bin/python

[root@yuhai Python-3.6.1]# ln -s /usr/local/python3.6/bin/python3.6 /usr/bin/python

查看现在的Python版本

[root@yuhai Python-3.6.1]# python -V

Python 3.6.1

还原到2.7.5版本

[root@a ~]# mv /usr/bin/python /usr/bin/python_3.6.1 #移动并重命名

[root@a ~]# mv /usr/bin/python_2.7.5 /usr/bin/python #移动并重命名

[root@a ~]# python -V #查看版本信息

Python 2.7.5