import sys
import os
import atexit
import readline

histfile = os.path.expanduser('~/.pythonhistory')
try:
    readline.read_history_file(histfile)
except IOError:
    pass
def write_history(readline=readline, histfile=histfile):
    try:
        readline.write_history_file(histfile)
    except IOError:
        pass
atexit.register(write_history)


if sys.version_info.major == 3:
    sys.ps1 = "3>>> "
    sys.ps2 = "3... "
else:
    sys.ps1 = "2>>> "
    sys.ps2 = "2... "

del readline, histfile, atexit, write_history, sys, os