Real Time CountDown Timer In Python

Question

As the title says, I wanna create a real-time countdown timer in python

So far, I have tried this

import time
def countdown(t):
    print('Countdown : {}s'.format(t))
    time.sleep(t)

But this let the app sleep for the 't' seconds but the seconds in the line don't update themselves

countdown(10)

Desired Output :

Duration : 10s

After 1 second, it should be

Duration : 9s

Yeah, the problem is the previous line Duration : 10s which I have to erase. Is there any way to do this?

Taufiq Rahman · Answer 1 · 2016-12-27T15:30:57.610

2

Simply do this:

import time
import sys

def countdown(t):
    while t > 0:
        sys.stdout.write('\rDuration : {}s'.format(t))
        t -= 1
        sys.stdout.flush()
        time.sleep(1)

countdown(10)

Import sys and use the sys.stdout.write instead of print and flush() the output before printing the next output.

Note: Use carriage return,"\r" before the string instead of adding a newline.

edited Dec 27 '16 at 15:30

answered Dec 27 '16 at 15:25

Taufiq Rahman

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When using a number 10 or higher, a trailing zero remains once the counter reaches number 9 and below. For example, `countdown(11)` will look like this: 11 --> 10 --> 90 --> 80 --> 70 --> etc. – howdoicode Aug 19 '20 at 20:11

score 1 · Accepted Answer · edited May 23 '17 at 12:07

I got a lot of help from this thread : remove last STDOUT line in Python

import time

def countdown(t):
    real = t
    while t > 0:
        CURSOR_UP = '\033[F'
        ERASE_LINE = '\033[K'
        if t == real:
            print(ERASE_LINE + 'Duration : {}s'.format(t))
        else:
            print(CURSOR_UP + ERASE_LINE + 'Duration : {}s'.format(t))
        time.sleep(1)
        t -= 1

countdown(4)

Real Time CountDown Timer In Python

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