1.准备一个脚本如下：

#!/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默认的模块存放地址

>>> import sys
>>> sys.path
['', '/usr/local/python2.7/lib/python2.7/site-packages/distribute-0.6.49-py2.7.egg', '/usr/local/python2.7/lib/python2.7/site-packages/pip-9.0.1-py2.7.egg', '/usr/local/python2.7/lib/python27.zip', '/usr/local/python2.7/lib/python2.7', '/usr/local/python2.7/lib/python2.7/plat-linux2', '/usr/local/python2.7/lib/python2.7/lib-tk', '/usr/local/python2.7/lib/python2.7/lib-old', '/usr/local/python2.7/lib/python2.7/lib-dynload', '/usr/local/python2.7/lib/python2.7/site-packages', '/usr/local/python2.7/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg-info']

3. 创建该脚本到默认模块存放路径

 vi /usr/local/python2.7/lib/python2.7/tab.py

4导入tab模块，验证.

>>> import tab
>>> sys.
sys.__class__(              sys.api_version             sys.hexversion
sys.__delattr__(            sys.argv                    sys.long_info