一、查询python安装路径，一般默认是/usr/lib64/
[root@host2 ~]# python
Python 2.6. (r266:, Jul , ::)
[GCC 4.4. (Red Hat 4.4.-)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> sys.path
['', '/usr/lib64/python26.zip', '/usr/lib64/python2.6', '/usr/lib64/python2.6/plat-linux2', '/usr/lib64/python2.6/lib-tk', '/usr/lib64/python2.6/lib-old', '/usr/lib64/python2.6/lib-dynload', '/usr/lib64/python2.6/site-packages', '/usr/lib64/python2.6/site-packages/gst-0.10', '/usr/lib64/python2.6/site-packages/gtk-2.0', '/usr/lib64/python2.6/site-packages/webkit-1.0', '/usr/lib/python2.6/site-packages']
二、切换到python的安装目录下，编辑tab键补全模块
[root@host2 ~]# cd /usr/lib64/python2./
[root@host2 python2.]# vim tab.py
#!/usr/bin/env python
# python startup file
import sys
import readline
import rlcompleter
import atexit
import os
# tab completion
readline.parse_and_bind('tab: complete')
# history file
histfile = os.path.join(os.environ['HOME'], '.pythonhistory')
try:
readline.read_history_file(histfile)
except IOError:
pass
atexit.register(readline.write_history_file, histfile)
del os, histfile, readline, rlcompleter
三、修改~/.bashrc
[root@host2 python2.]# echo "export PYTHONSTARTUP=/usr/lib64/python2.6/tab.py" >> ~/.bashrc
[root@host2 python2.]# source ~/.bashrc
四、进入python测试，可正常使用tab补全功能了