How to output to the same line overwriting the previous line?

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You can use the “return”-character \r to return to the beginning of the line. In Python 2.x, you’ll have to use sys.stdout.write and sys.stdout.flush instead of print.

import time, sys
while True:
    sys.stdout.write("\r" + time.ctime())
    sys.stdout.flush()
    time.sleep(1)

In Python 3.3, you can use the print function, with end and flush parameters:

    print(time.ctime(), end="\r", flush=True)

Note, however, that this way you can only replace the last line on the screen. If you want to have a “live” clock in a more complex console-only UI, you should check out curses.

import time, curses
scr = curses.initscr()
scr.addstr(0, 0, "Current Time:")
scr.addstr(2, 0, "Hello World!")
while True:
    scr.addstr(0, 20, time.ctime())
    scr.refresh()
    time.sleep(1)
curses.endwin()

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