python tab键自动补全

#!/usr/bin/python
import os
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