Python Countdown Timer
This utility creates a simple countdown timer that updates in real-time on the command line. It demonstrates the use of the time module and carriage returns (\r) to overwrite the previous output line.
Modules Used:
time: To handle the delay between seconds.
The Code
Save this as timer.py.
import time
def countdown(t):
"""
Counts down from t seconds.
"""
while t:
# Calculate minutes and seconds
mins, secs = divmod(t, 60)
# Format as MM:SS
timer = '{:02d}:{:02d}'.format(mins, secs)
# Print the time, overwriting the previous line
# end="\r" moves the cursor back to the start of the line
print(timer, end="\r")
time.sleep(1)
t -= 1
print('Timer completed!')
if __name__ == "__main__":
try:
t = input("Enter the time in seconds: ")
countdown(int(t))
except ValueError:
print("Please enter a valid integer.")
except KeyboardInterrupt:
print("\nTimer stopped.")Usage
python timer.py