python自动补全

#!/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)

del os, histfile, readline, rlcompleter