CentOS下python2.6升级2.7

Linux

`date 2018年5月18日15:51:45`

查看当前系统版本

Python 2.6.6 (r266:84292, Nov 22 2013, 12:16:22) 
[GCC 4.4.7 20120313 (Red Hat 4.4.7-4)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
dlopen("/usr/lib64/python2.6/lib-dynload/readline.so", 2);
import readline # dynamically loaded from /usr/lib64/python2.6/lib-dynload/readline.so
>>>

1.安装devtoolset

$ yum groupinstall "Development tools"

2.安装编译Python需要的包

yum install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel

3.下载并解压Python 2.7.9的源代码

$ cd /tmp/
$ wget --no-check-certificate https://www.python.org/ftp/python/2.7.9/Python-2.7.9.tar.xz
$ tar xf Python-2.7.9.tar.xz
$ cd Python-2.7.9

4.编译与安装Python 2.7.9

$ ./configure --prefix=/usr/local
$ make && make altinstall

5.配置软连接，让系统pyhon默认指向python2.7.9

备份
mv /usr/bin/python /usr/bin/python2.6_temp
制作软连接
ln -s /usr/local/bin/python2.7 /usr/bin/python
$ python -V  # 查看Python 2.7.9

6.yum与python2.7不兼容，修改yum文件

vim /usr/bin/yum
将"!/usr/bin/python"改为"!/usr/bin/python2.6"

7.配置环境变量

$  vim /etc/profile
# 添加如下内容：
PY_HOME=/usr/local/bin/python2.7
export PATH=$PY_HOME/bin:$PATH

8.启动环境变量配置

source /etc/profile  or . /etc/profile 
echo $PATH #查看环境变量中是否包含python路径
[root@abcdocker ~]# echo $PATH
/usr/local/bin/python2.7/bin:/usr/local/node/bin:/usr/local/mysql/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin:/root/bin