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+--- Thread: How do I create a timer that counts down? (/thread-11046.html)
How do I create a timer that counts down? - LavaCreeperKing - Jun-19-2018
Could some one tell me how to make a timer that counts down? I have no problem making one that counts up, but I am at a loss with trying to figure out how to make one count down. To start I create a list of numbers.
time = [2,0,0,0]This represents 20:00.(I combine all the numbers in to one string and display it as text. I can't figure out how to make it count down. If I were to make it count up I would do this.
time[3] += 1
if time[3] == 10:
time[2] += 1
time[3] = 0
if time[2] == 6:
time[1] += 1
time[2] = 0
if time[1] == 10:
time[0] += 1
time[1] = 0I have this in a loop that runs once every second. Then when time[0] == 6 I just stop the loop. But How would I make a timer that counts down?
RE: How do I create a timer that counts down? - gontajones - Jun-19-2018
Just use the datetime module:
from datetime import datetime,timedelta
import time
start = "20:00:00"
dt = datetime.strptime(start,"%H:%M:%S")
while True:
print(dt.time())
dt = dt - timedelta(seconds=1)
time.sleep(1)
RE: How do I create a timer that counts down? - ichabod801 - Jun-19-2018
Subtract one from the smallest unit. If that results in -1, set that unit to the max, and subtract one from the next highest unit. When it's all zeros, you're done.
RE: How do I create a timer that counts down? - gontajones - Jun-19-2018
time[3] -= 1
if time[3] < 0:
time[3] = 9
time[2] -= 1
if time[2] < 0:
time[2] = 5
time[1] -= 1
if time[1] < 0:
time[1] = 9
time[0] -= 1
if time[0] < 0:
time[0] = 2
time[1] = 3
RE: How do I create a timer that counts down? - LavaCreeperKing - Jun-20-2018
Thank you.