Python idle界面 tab补全

# 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'],'.pythonjistory')
try:
    readline.read_history_file(histfile)
except IOError:
    pass
atexit.register(readline.write_history_file,histfile)