Python2.7安装教程

Python2.7安装教程

[root@~/software]# yum install bzip*
[root@~/software]# wget http://www.python.org/ftp/python/2.7.3/Python-2.7.3.tgz
[root@~/software]# tar zxvf Python-2.7.3.tgz
[root@~/software]# cd Python-2.7.3
[root@~/software/Python-2.7.3]# ./configure
[root@~/software/Python-2.7.3]# make && make install
[root@~/software]# cd /usr/local/bin/
[root@/usr/local/bin]# ls -al python*
lrwxrwxrwx 1 root root       7 Nov 16 18:24 python -> python2
lrwxrwxrwx 1 root root       9 Nov 16 18:24 python2 -> python2.7
-rwxr-xr-x 1 root root 6162217 Nov 16 18:23 python2.7
-rwxr-xr-x 1 root root    1624 Nov 16 18:24 python2.7-config
lrwxrwxrwx 1 root root      16 Nov 16 18:24 python2-config -> python2.7-config
lrwxrwxrwx 1 root root      14 Nov 16 18:24 python-config -> python2-config
[root@/usr/local/bin]# /usr/local/bin/python -V
Python 2.7.3

如此安装就完成了。但是因为部分软件，如node.js依赖python2.7，此时需要修改系统路径python命令指向2.7.3版本：

[root@/usr/local/bin]# cp /usr/bin/python /usr/bin/python.bak.2014.11.16
[root@/usr/local/bin]# rm /usr/bin/python
[root@/usr/local/bin]# ln -s /usr/local/bin/python2.7 /usr/bin/python

如此，如果遇到yum出问题，如下“There was a problem importing one of the Python modules”：

[root@~/software/Python-2.7.3]# yum search bzip
There was a problem importing one of the Python modules
required to run yum. The error leading to this problem was:
 
   No module named yum
 
Please install a package which provides this module, or
verify that the module is installed correctly.
 
It's possible that the above module doesn't match the
current version of Python, which is:
2.7.3 (default, Nov 16 2014, 18:22:57) 
[GCC 4.4.7 20120313 (Red Hat 4.4.7-4)]
 
If you cannot solve this problem yourself, please go to 
the yum faq at:
  http://yum.baseurl.org/wiki/Faq

这是因为yum依赖老版本的python，可以按如下操作修复：

[root@~/software/Python-2.7.3]# vim /usr/bin/yum

修改第一行命令行，将python指向指定版本就行了：

  1 #!/usr/bin/python2.6
  2 import sys
  3 try:
  4     import yum