python命令行添加Tab键自动补全

1、编写一个tab的自动补全脚本,名为tab.py

#!/usr/bin/python
# python tab complete 

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 

2、在python中查看python的模块路径信息

>>> import sys
>>> sys.path
['', '/usr/lib/python26.zip', '/usr/lib/python2.6', '/usr/lib/python2.6/plat-linux2', '/usr/lib/python2.6/lib-tk', '/usr/lib/python2.6/lib-old', '/usr/lib/python2.6/lib-dynload', '/usr/lib/python2.6/site-packages', '/usr/lib/python2.6/site-packages/gst-0.10', '/usr/lib/python2.6/site-packages/gtk-2.0', '/usr/lib/python2.6/site-packages/webkit-1.0']
>>> 

python的模块放在了/usr/lib/python26下面，将脚本拷贝到该目录下，在使用时导入即可。

3、导入tab

>>> import tab
>>> os.
Display all 244 possibilities? (y or n)

4、但python读取模块的路径顺序优先是从当前目录开始，所以若是当前目录也存在tab.py，但内容不同的python脚本，则可能会报错，所以在环境变量中也指定tab.py脚本

#for python
export PYTHONSTARTUP=/usr/lib/python2.6/tab.py