Python配置tab自动补全功能

#!/usr/bin/python
# python tab fileimport 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

Python 2.7.5 (default, Jul 13 2018, 13:06:57)
[GCC 4.8.5 20150623 (Red Hat 4.8.5-28)] on linux2
Type "help", "copyright", "credits" or "license" for more information.

['', '/usr/lib64/python27.zip', '/usr/lib64/python2.7', '/usr/lib64/python2.7/plat-linux2', '/usr/lib64/python2.7/lib-tk', '/usr/lib64/python2.7/lib-old', '/usr/lib64/python2.7/lib-dynload', '/usr/lib64/python2.7/site-packages', '/usr/lib64/python2.7/site-packages/gtk-2.0', '/usr/lib/python2.7/site-packages']

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