python在交互模式下，输入命令的时候按tab键就按时间tab键的功能输出，在书写python时多有不便。

把下面的代码写入一个文件tab.py，放到/usr/lib/python2.6/site-packages/下

#!/usr/bin/env python
import sys
import readline
import rlcompleter
import atexit
import os
readline.parse_and_bind('tab:complete')
histfile = os.path.join(os.environ['HOME'],'.pythonhistory')
try:
        readline.read_history_file(histfile)
except IOError:
        pass
        atexit.register(readline.write_history_file,histfile)

使用方法：

python进入交互模式：

>>> import tab
>>> import sys
>>> sys.
sys.__class__(              sys.api_version             sys.hexversion
sys.__delattr__(            sys.argv                    sys.last_type(
sys.__dict__                sys.builtin_module_names    sys.last_value
sys.__displayhook__(        sys.byteorder               sys.maxint
sys.__doc__                 sys.call_tracing(           sys.maxsize
sys.__egginsert             sys.callstats(              sys.maxunicode
sys.__excepthook__(         sys.copyright               sys.meta_path
sys.__format__(             sys.displayhook(            sys.modules
sys.__getattribute__(       sys.dont_write_bytecode     sys.path
sys.__hash__(               sys.exc_clear(              sys.path_hooks
sys.__init__(               sys.exc_info(               sys.path_importer_cache
sys.__name__                sys.exc_type                sys.platform
sys.__new__(                sys.excepthook(             sys.prefix
sys.__package__             sys.exec_prefix             sys.ps1
sys.__plen                  sys.executable              sys.ps2
sys.__reduce__(             sys.exit(                   sys.py3kwarning
sys.__reduce_ex__(          sys.exitfunc(               sys.setcheckinterval(
sys.__repr__(               sys.flags                   sys.setdlopenflags(
sys.__setattr__(            sys.float_info              sys.setprofile(
sys.__sizeof__(             sys.getcheckinterval(       sys.setrecursionlimit(
sys.__stderr__              sys.getdefaultencoding(     sys.settrace(
sys.__stdin__               sys.getdlopenflags(         sys.stderr
sys.__stdout__              sys.getfilesystemencoding(  sys.stdin
sys.__str__(                sys.getprofile(             sys.stdout
sys.__subclasshook__(       sys.getrecursionlimit(      sys.subversion
sys._clear_type_cache(      sys.getrefcount(            sys.version
sys._current_frames(        sys.getsizeof(              sys.version_info
sys._getframe(              sys.gettrace(               sys.warnoptions
>>> sys.

这样就很方便查看功能模块了。