Create a countdown timer in Python

I can share a sample code, with a few lines to demonstrate the countdown down timer.

import time

# Time time in seconds
t = 10
while t:
    mins, secs = divmod(t, 60)
    timer = '{:02d}:{:02d}'.format(mins, secs)
    print(timer, end="\r")
    time.sleep(1)
    t -= 1
print('Time Up !!')

The code is simple. I hope you can understand it.