Python中tab键自动补全功能的配置

新手学习python的时候，如何没有tab键补全功能，我感觉那将是一个噩梦，对于我们这种菜鸟来说，刚接触python，对一切都不了解，还好有前辈们的指导，学习一下，并记录下来，还没有学习这个功能小伙伴们！赶紧get吧！

• 1.首先我们需要查看python的安装路径

[root@localhost ~]# python
Python 2.6.6 (r266:84292, Oct 12 2012, 14:23:48) 
[GCC 4.4.6 20120305 (Red Hat 4.4.6-4)] 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']

• 切换目录到python的安装目录下，进行tab键补全模块的编写。

[root@localhost ~]# cd /usr/lib64/python2.6
[root@localhost python2.6]# 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

• 此处我们编写完成后就可以进入python中导入tab键补全

root@localhost python2.6]# python
Python 2.6.6 (r266:84292, Oct 12 2012, 14:23:48) 
[GCC 4.4.6 20120305 (Red Hat 4.4.6-4)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import tab
>>> sys.
sys.__class__(              sys.__reduce_ex__(          sys.builtin_module_names    sys.exitfunc(               sys.maxsize                 sys.setprofile(
sys.__delattr__(            sys.__repr__(               sys.byteorder               sys.flags                   sys.maxunicode              sys.setrecursionlimit(
sys.__dict__                sys.__setattr__(            sys.call_tracing(           sys.float_info              sys.meta_path               sys.settrace(
sys.__displayhook__(        sys.__sizeof__(             sys.callstats(              sys.getcheckinterval(       sys.modules                 sys.stderr
sys.__doc__                 sys.__stderr__              sys.copyright               sys.getdefaultencoding(     sys.path                    sys.stdin
sys.__excepthook__(         sys.__stdin__               sys.displayhook(            sys.getdlopenflags(         sys.path_hooks              sys.stdout
sys.__format__(             sys.__stdout__              sys.dont_write_bytecode     sys.getfilesystemencoding(  sys.path_importer_cache     sys.subversion
sys.__getattribute__(       sys.__str__(                sys.exc_clear(              sys.getprofile(             sys.platform                sys.version
sys.__hash__(               sys.__subclasshook__(       sys.exc_info(               sys.getrecursionlimit(      sys.prefix                  sys.version_info
sys.__init__(               sys._clear_type_cache(      sys.exc_type                sys.getrefcount(            sys.ps1                     sys.warnoptions
sys.__name__                sys._current_frames(        sys.excepthook(             sys.getsizeof(              sys.ps2                     
sys.__new__(                sys._getframe(              sys.exec_prefix             sys.gettrace(               sys.py3kwarning             
sys.__package__             sys.api_version             sys.executable              sys.hexversion              sys.setcheckinterval(       
sys.__reduce__(             sys.argv                    sys.exit(                   sys.maxint                  sys.setdlopenflags(         

• 为了进入python之后不用每次都导入，来进行下边的操作，进入家目录，编写 .bashrc文件在最后添加下面一行，保存退出。

[root@localhost ~]# cd ~
[root@localhost ~]# vim .bashrc

export PYTHONSTARTUP=/usr/lib64/python2.6/tab.py

• 家目录.bashrc文件只有用户登录时才会加载生效，需要进行下面的操作来生效

[root@localhost ~]# source .bashrc 

OK，那么现在我们就可以不用每次进行python之后进行import tab 动作来使tab键补全功能生效了。