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CentOS7中的python版本为python2.7.5，升级到最新版的python时需要注意两个问题
下面对新版的安装步骤进行说明。
一、下载并安装最新版python
1.下载并解压
# wget https://www.python.org/ftp/python/3.5.2/Python-3.5.2.tgz # tar -zxf Python-3.5.2.tgz
2.安装Python
# cd Python-3.5.2/# ./configure
# make
# make install
查看是否安装成功
# /usr/local/bin/python3.5
Python 3.5.2 (default, Jul 24 2016, 14:46:50)
[GCC 4.8.5 20150623 (Red Hat 4.8.5-4)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>>
3.修改python的系统默认指向，修改软链接
正常情况下，新版本的python安装后系统等其他应用指向的python环境依然是老版本的python，
如果删除老版本后再装新版本会面临很多难以定位的麻烦，所以通常的做法是：
老版本依然保留，新版本并行存在。操作方法如下
（1）修改系统默认的python修改为2.7.5版本 # mv /usr/bin/python /usr/bin/python2.7.5 （2）创建软连接使python指向新版本 # ln -s /usr/local/bin/python3.5 /usr/bin/python （3）检测是否更新成功 [root@localhost ~]# python Python 3.5.2 (default, Jul 24 2016, 14:46:50) [GCC 4.8.5 20150623 (Red Hat 4.8.5-4)] on linux Type "help", "copyright", "credits" or "license" for more information. >>>
二、yum报错问题解决
1.终端下输入yum后报错信息如下
[root@localhost ~]# yum File "/usr/bin/yum", line 30 except KeyboardInterrupt, e: ^ SyntaxError: invalid syntax
2.vim /usr/bin/yum
修改python头部python为python2.7.5
#!/usr/bin/python2.7.5 import sys try: import yum except ImportError: print >> sys.stderr, """\ There was a problem importing one of the Python modules required to run yum. The error leading to this problem was:
3.再次查看yum是否可用
[root@localhost ~]# yum Loaded plugins: fastestmirror, langpacks You need to give some command Usage: yum [options] COMMAND List of Commands: check Check for problems in the rpmdb check-update Check for available package updates clean Remove cached data deplist List a package‘s dependencies ... ...
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原文地址：http://www.cnblogs.com/tdcqma/p/5700832.html
