prints the current time

clock.py

import time
import datetime

CURSOR_UP_ONE = '\x1b[1A'
ERASE_LINE = '\x1b[2K'
time_format = ['%I:%M:%S %p','%I %M %S %p']
while (True): 
    print CURSOR_UP_ONE + ERASE_LINE + CURSOR_UP_ONE
    print datetime.datetime.now().strftime(time_format[0])
    time_format.reverse()
    time.sleep(1)