Python Countdown code

#!/usr/bin/python3
import time

def countdown(time_sec):
while time_sec:
mins, secs = divmod(time_sec, 60)
timeformat = "{:02d}:{:02d}".format(mins, secs)
print(timeformat, end="\r")
time_sec -= 1

print("time ended !")

countdown(5) # 5 seconds