linux系统(散仙的是centos6.5)自带的python的版本是2.6的,如果我们想使用新的python3.x怎么办,我们不需要卸载原来的python,在py的脚本文件里指定加载的python的路径即可。
默认的系统自带的python脚本如下所示:
[root@Slave2 ~]# py
pydoc python python2 python2.6 python2.6-config python-config
[root@Slave2 ~]# which python
/usr/bin/python
[root@Slave2 ~]#
我们首先执行 yum update python -y如果升级失败,则选择编译源码升级,yum升级的方式,一般都会失败,所以大家还是准备编译源码安装python3.4比较靠谱。
1,如果是centos的精简版的建议先安装一些依赖的相关包:
yum install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gcc make
2,然后下载python3.4的源码包
wget https://www.python.org/ftp/python/3.4.0/Python-3.4.0.tgz
-rw-r--r-- 1 root root 19M 3月 17 2014 Python-3.4.0.tgz
3,解压到/usr/local/src下
tar xf Python-3.4.0.tgz -C /usr/local/src/
进入执行编译:
cd /usr/local/src/Python-3.4.0/
./configure --prefix=/usr/local/python3.4
make -j4 && make install
4,给python3.4添加环境变量:
PATH=$PATH:$HOME/bin:/usr/local/python3.4/bin
然后退出登录,再次查看python命令:
[root@master ~]# py
pydoc pydoc3.4 python2 python3 python3.4-config python3.4m-config pyvenv
pydoc3 python python2.6 python3.4 python3.4m python3-config pyvenv-3.4
[root@master ~]# py
pydoc pydoc3.4 python2 python3 python3.4-config python3.4m-config pyvenv
pydoc3 python python2.6 python3.4 python3.4m python3-config pyvenv-3.4
[root@master ~]# py
我们发现python3.4已经有了,原来的2.6也存在,我们可以选择执行那个版本的python:
[root@master ~]# python2
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.
>>> exit()
[root@master ~]# python3
Python 3.4.0 (default, Sep 24 2014, 00:45:56)
[GCC 4.4.7 20120313 (Red Hat 4.4.7-4)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> exit()
[root@master ~]#
执行我们的python3.4就安装成功了。