Python命令行添加Tab键自动补全功能

（一）系统环境：

OS：centos 6.5final

Python: 2.6.6

(二）步骤：

1，写一个Python自动补全脚本首先readline和rlcompleter模块具体如下：，

[[email protected] python2.6]# vim tab.py

#!/usr/bin/python 
# python TAB 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

2，查看Python默认的模块的存放路径，有下可知默认的路径/usr/lib/python2.6/

[[email protected] ~]# python
Python 2.6.6 (r266:84292, Jul 23 2015, 15:22:56) 
[GCC 4.4.7 20120313 (Red Hat 4.4.7-11)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> sys.path
[‘‘, ‘/usr/lib/python2.6/site-packages/setuptools-0.6c11-py2.6.egg‘, ‘/usr/lib/python2.6/site-packages/pip-1.5.4-py2.6.egg‘, ‘/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/gtk-2.0‘, ‘/usr/lib/python2.6/site-packages‘]
>>>

默认的路径/usr/lib/python2.6/

3，拷贝上边的脚本到该路径下

[[email protected] site-packages]# cp tab.py /usr/lib/python2.6/

4，导入该模块即可以使用了。

>>> import tab
>>> sys.
sys.__class__(              sys.api_version             sys.hexversion
sys.__delattr__(            sys.argv                    sys.maxint
sys.__dict__                sys.builtin_module_names    sys.maxsize
sys.__displayhook__(        sys.byteorder               sys.maxunicode
sys.__doc__                 sys.call_tracing(           sys.meta_path
sys.__egginsert             sys.callstats(              sys.modules
sys.__excepthook__(         sys.copyright               sys.path
sys.__format__(             sys.displayhook(            sys.path_hooks
sys.__getattribute__(       sys.dont_write_bytecode     sys.path_importer_cache
sys.__hash__(               sys.exc_clear(              sys.platform
sys.__init__(               sys.exc_info(               sys.prefix
sys.__name__                sys.exc_type                sys.ps1
sys.__new__(                sys.excepthook(             sys.ps2
sys.__package__             sys.exec_prefix             sys.py3kwarning