python中使用tab补全

要能够使用import tab，最主要的是要有readline模块。默认python2.6虽然没有装tab模块，但是装了readline模块的。如下：

[root@90-163 robin]# Python2.6
Python 2.6.6 (r266:84292, Nov 22 2013, 12:16:22)
[GCC 4.4.7 20120313 (Red Hat 4.4.7-4)] on linux2
Type "help", "copyright", "credits" or "license" for more infORMation.
>>> import tab
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named tab
>>> import readline

>>>

而python2.7默认tab模块和readline模块都没有安装

[root@90-163 robin]# python
Python 2.7.5 (default, Apr 16 2015, 15:21:18)
[GCC 4.4.7 20120313 (Red Hat 4.4.7-4)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import tab
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named tab
>>> import readline
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named readline

python2.6能够import readline成功的原因是因为有这个模块：/usr/lib64/python2.6/lib-dynload/readline.so （默认安装就有的），python2.7.5不能import readline成功的原因就是没有这个模块。所以将这个模块cp到python2.7的相关目录下既可以了。操作如下：

[root@90-163 lib-dynload]# cp  /usr/lib64/python2.6/lib-dynload/readline.so /usr/local/lib/python2.7/lib-dynload/
[root@90-163 lib-dynload]# python
Python 2.7.5 (default, Apr 16 2015, 15:21:18)
[GCC 4.4.7 20120313 (Red Hat 4.4.7-4)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import readline
>>> 

然后在/usr/local/lib/python2.7/site-packages 添加一个tab.py文件即可使用import tab，内容如下；

[root@90-163 site-packages]# pwd
/usr/local/lib/python2.7/site-packages
[root@90-163 site-packages]# cat tab.py
try:
    import readline
except ImportError:
    print("Module readline not available.")
else:
    import rlcompleter
    readline.parse_and_bind("tab: complete")

进行测试：

>>> import readline
>>> import tab
>>> import os
>>> os.w
os.wait(     os.wait3(    os.wait4(    os.waitpid(  os.walk(     os.write(