[root@centos7 ~]# cat tab.py

#!/usr/bin/python3.6

# 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'],'.pythonhistory')

try:

    readline.read_history_file(histfile)

except IOError:

    pass

atexit.register(readline.write_history_file,histfile)

del os, histfile, readline,rlcompleter