Based on my testing, this is because threads can only be started once, and as the timer relies on a thread, the timer can only be started once. This means that the only way to re-start the timer would be to do:
def newTimer():
global t
t = Timer(10.0,api_call)
newTimer()
instead of the t = Timer part, and do
t.cancel()
newTimer()
t.start()
instead of the current re-start code.
This makes your full code:
from threading import Timer
def api_call():
print("Call that there api")
def newTimer():
global t
t = Timer(10.0,api_call)
newTimer()
def my_callback(channel):
if something_true:
print('reset timer and start again')
t.cancel()
newTimer()
t.start()
print("\n timer started")
elif something_else_true:
t.cancel()
print("timer canceled")
else:
t.cancel()
print('cancel timer for sure')
try:
if outside_input_that_can_happen_a_lot:
my_callback()
finally:
#cleanup objects
Hope this helps.
Answer from CrazySqueak on Stack OverflowGitHub
gist.github.com › aeroaks › ac4dbed9c184607a330c
Reset Timer in Python · GitHub
Reset Timer in Python. GitHub Gist: instantly share code, notes, and snippets.
Top answer 1 of 2
8
Based on my testing, this is because threads can only be started once, and as the timer relies on a thread, the timer can only be started once. This means that the only way to re-start the timer would be to do:
def newTimer():
global t
t = Timer(10.0,api_call)
newTimer()
instead of the t = Timer part, and do
t.cancel()
newTimer()
t.start()
instead of the current re-start code.
This makes your full code:
from threading import Timer
def api_call():
print("Call that there api")
def newTimer():
global t
t = Timer(10.0,api_call)
newTimer()
def my_callback(channel):
if something_true:
print('reset timer and start again')
t.cancel()
newTimer()
t.start()
print("\n timer started")
elif something_else_true:
t.cancel()
print("timer canceled")
else:
t.cancel()
print('cancel timer for sure')
try:
if outside_input_that_can_happen_a_lot:
my_callback()
finally:
#cleanup objects
Hope this helps.
2 of 2
0
Here is a small class which does exactly that from CrazySqueak's answer. So please upvote his answer not mine!
import threading
class AdvTimer():
def __init__(self, interval, callback):
self.interval = interval
self.callback = callback
def restart(self):
self.timer.cancel()
self.start()
def start(self):
self.timer = threading.Timer(self.interval, self.callback)
self.timer.start()
Timer cannot restart after it is being stopped in Python - Stack Overflow
I am using Python 2.7. I have a timer that keeps repeating a timer callback action until it has been stopped. It uses a Timer object. The problem is that after it has been stopped, it cannot be res... More on stackoverflow.com
Python: Run code every n seconds and restart timer on condition - Stack Overflow
This may be simpler than I think but I'd like to create timer that, upon reaching a limit (say 15 mins), some code is executed. Meanwhile every second, I'd like to test for a condition. If the More on stackoverflow.com
How do I stop a function and restart it when it is called again?
You can make a generator function that yields a result, and you call next every time you want the next iteration. These are functions that are designed to continue where you left off each time you ask for the next iteration. https://realpython.com/introduction-to-python-generators/ mini-example from that article: def multi_yield(): yield_str = "This will print the first string" yield yield_str yield_str = "This will print the second string" yield yield_str multi_obj = multi_yield() print(next(multi_obj)) #This will print the first string print(next(multi_obj)) #This will print the second string print(next(multi_obj)) # raises the StopIteration exception More on reddit.com
3
7
August 18, 2021Created My First Tkinter Project: Count-Down Timer : Reset/pause and resume buttons.
pause = "No" an option is to use paused = False which is more pythonic. Glad you are having fun More on reddit.com
10
52
March 20, 2023PyPI
pypi.org › project › resettabletimer
Client Challenge
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Top answer 1 of 2
10
Here is a corrected version:
from __future__ import print_function
from threading import Timer
def hello():
print("Hello World!")
class RepeatingTimer(object):
def __init__(self, interval, f, *args, **kwargs):
self.interval = interval
self.f = f
self.args = args
self.kwargs = kwargs
self.timer = None
def callback(self):
self.f(*self.args, **self.kwargs)
self.start()
def cancel(self):
self.timer.cancel()
def start(self):
self.timer = Timer(self.interval, self.callback)
self.timer.start()
t = RepeatingTimer(3, hello)
t.start()
Example Run:
$ python -i foo.py
>>> Hello World!
>>> Hello World!
>>> t.cancel()
2 of 2
2
The reason your timer is not restarting is because you never reset self.interval to True before trying to restart the timer. However, if that's the only change you make, you will find your timer is vulnerable to a race condition that will result in more than one timer running concurrently.
ActiveState
code.activestate.com › recipes › 577407-resettable-timer-class-a-little-enhancement-from-p
Resettable Timer class (a little enhancement from python builtin Timer class) « Python recipes « ActiveState Code
A more simple resettable timer class, by adding few logic from python builtin Timer code.
Python
mail.python.org › pipermail › tutor › 2012-November › 092767.html
[Tutor] Reusing Timers (threading.timer)
November 14, 2012 - Changing the timer is not supported. I expect that calling my_timer.start() after cancelling it would restart it, but haven't tested it. Just because you create a new timer doesn't mean you have to give it an entirely new name. > 3. If I get a value from a textbox, how do I parse it from the string > value to an integer (or float)?
Top answer 1 of 5
3
You could probably accomplish it with threading really elegantly but if you need a quick fix you could try
import time
timer = 15 * 60 # 60 seconds times 15 mins
while timer > 0:
time.sleep(0.985) # don't sleep for a full second or else you'll be off
timer -= 1
if someCondition:
timer = 15 * 60
executeCode() # called when time is zero and while loop is exited
2 of 5
1
If the whole process is as simple as you say, I would go about it like this (semi-psuedo-code):
def run_every_fifteen_minutes():
pass
def should_reset_timer():
pass
def main():
timer = 0
while True:
time.sleep(1)
timer+=1
if should_reset_timer():
timer = 0
if timer == 15*60:
run_every_fifteen_minutes()
timer = 0
Note that this won't be exactly fifteen minutes in. It might be late by a few seconds. The sleep isn't guaranteed to sleep only 1 second and the rest of the loop will take some time, too. You could add a system time compare in there if you need it to be really accurate.
Real Python
realpython.com › python-timer
Python Timer Functions: Three Ways to Monitor Your Code – Real Python
December 8, 2024 - On the other hand, when you call .stop(), you first check that the Python timer is running. If it is, then you calculate the elapsed time as the difference between the current value of perf_counter() and the one that you stored in ._start_time. Finally, you reset ._start_time so that the timer can be restarted, and print the elapsed time.
Reddit
reddit.com › r/learnpython › how do i stop a function and restart it when it is called again?
r/learnpython on Reddit: How do I stop a function and restart it when it is called again?
August 18, 2021 -
I've searched around the internet and I can't seem to find an answer. I have a series of checkboxes that when clicked, calls a function that is a countdown timer. If I wait for the timer to end, and click another checkbox, it works fine. But if I check a second box while the other is still running, it starts another timer so then I have 2 timers running... or 3 or 4 depending on how many checkboxes I click. If I click another checkbox while the timer is still running, how do I get it to stop the first timer and start over?
def countdown(count): import beepy label['text'] = count if count >= 0: root.after(1000, countdown, count - 1) else: beepy.beep(4) label['text'] = 0
each checkbox has this code to call the countdown function:
ttk.Checkbutton(routine, command=lambda: countdown(45))
Top answer 1 of 2
5
You can make a generator function that yields a result, and you call next every time you want the next iteration. These are functions that are designed to continue where you left off each time you ask for the next iteration. https://realpython.com/introduction-to-python-generators/ mini-example from that article: def multi_yield(): yield_str = "This will print the first string" yield yield_str yield_str = "This will print the second string" yield yield_str multi_obj = multi_yield() print(next(multi_obj)) #This will print the first string print(next(multi_obj)) #This will print the second string print(next(multi_obj)) # raises the StopIteration exception
2 of 2
3
If you remember the id returned by after, you can use after_cancel to cancel the scheduled call: id = None def countdown(count, new=True): global id if new and id is not None: root.after_cancel(id) id = None label['text'] = count if count >= 0: id = root.after(1000, countdown, count - 1, False) else: id = None beepy.beep(4) label['text'] = 0 It'd be better practice to wrap this in a class to get rid of the global variable, but there you go.
Raspberry Pi Forums
forums.raspberrypi.com › board index › programming › python
A resetable background timer? - Raspberry Pi Forums
My current task is to switch an output pin using an input pin. The plan is easy: after 23 seconds of inactivity, the output goes low. If a button is pressed during that time, the timer gets reset. If that button is pressed after the the output is already low, the output is pulled high and the ...
YouTube
youtube.com › the python oracle
Python timer start and reset - YouTube
Become part of the top 3% of the developers by applying to Toptal https://topt.al/25cXVn--Music by Eric Matyashttps://www.soundimage.orgTrack title: Darkness...
Published January 2, 2023 Views 322
Reddit
reddit.com › r/learnpython › created my first tkinter project: count-down timer : reset/pause and resume buttons.
r/learnpython on Reddit: Created My First Tkinter Project: Count-Down Timer : Reset/pause and resume buttons.
March 20, 2023 -
Been learning functions and how to add them to buttons and working with time in general. So wanted to create a little project that will test me on those areas.
import tkinter as tk
from tkinter import *
import time
root = Tk()
root.title(' COUNT-DOWN TIMER')
#root.geometry("800x400")
root['background']='#2F4F4F'
total_time = 0
rest = 0
pause = "No"
#####ADD/MINUS/RESET FUNCTIONS
def add_time_hour():
global total_time
total_time += 3600
countdown_label.config(text=f"{total_time//3600:02}:{(total_time//60)%60:02}:{total_time%60:02}",fg = '#00FF00',font=("Arial", 24))
def add_time_min():
global total_time
total_time += 60
countdown_label.config(text=f"{total_time//3600:02}:{(total_time//60)%60:02}:{total_time%60:02}",fg= "#00FF00",font=("Arial", 24))
def add_time_sec():
global total_time
total_time += 1
countdown_label.config(text=f"{total_time//3600:02}:{(total_time//60)%60:02}:{total_time%60:02}",fg= "#00FF00",font=("Arial", 24))
def add_rest_min():
global rest
rest += 60
rest_label.config(text=f"{(rest // 3600) % 3600:02}:{(rest // 60) % 60:02}:{rest % 60:02}",fg= "#00FF00",font=("Arial", 24))
def reset():
global total_time, rest,pause
pause = "No"
total_time = 0
rest = 0
countdown_label.config(text=f"{total_time//3600:02}:{(total_time//60)%60:02}:{total_time%60:02}",fg= "#00FF00",font=("Arial", 24))
rest_label.config(text=f"{(rest // 3600) % 3600:02}:{(rest // 60) % 60:02}:{rest % 60:02}",fg= "#00FF00",font=("Arial", 24))
############TIME FUNCTIONS#############################################
def countdown():
global total_time,rest, pause
if total_time > 0 and pause == "No":
total_time -= 1
countdown_label.config(text=f"{(total_time // 3600) % 3600:02}:{(total_time // 60) % 60:02}:{total_time % 60:02}",fg="#00FF00", font=("Arial", 24))
root.after(1000,countdown)
if total_time == 0:
countdown_label.config(
text=f"{(total_time // 3600) % 3600:02}:{(total_time // 60) % 60:02}:{total_time % 60:02}", fg="red",
font=("Arial", 24))
elif total_time == 0 and rest > 0 and pause == "No":
rest -= 1
rest_label.config(text=f"{(rest// 3600) % 3600:02}:{(rest // 60) % 60:02}:{rest % 60:02}", fg="#00FF00", font=("Arial", 24))
root.after(1000,countdown)
if rest == 0:
rest_label.config(text=f"{(rest // 3600) % 3600:02}:{(rest // 60) % 60:02}:{rest % 60:02}", fg="red",
font=("Arial", 24))
def countdown_pause():
global pause
pause = "Yes"
def countdown_unpause():
global pause
pause = "No"
countdown()
#############LABELS####################
countdown_label = tk.Label(text = "00:00:00",fg="#00FF00",bg='#2F4F4F', font=("Arial", 24))
countdown_label.grid(row= 0, column = 2, columnspan=2)
countdown_label_title = tk.Label(text = "RUNNING: ",fg="#00FF00",bg='#2F4F4F', font=("Arial", 24))
countdown_label_title.grid(row= 0, column = 0, columnspan=2)
rest_label = tk.Label(text = "00:00:00", fg= "#00FF00",bg='#2F4F4F',font=("Arial", 24))
rest_label.grid(row= 1, column = 2, columnspan=2)
rest_label_title = tk.Label(text = "RESTING: ",fg="#00FF00",bg='#2F4F4F', font=("Arial", 24))
rest_label_title.grid(row= 1, column = 0, columnspan= 2)
#BUTTONS###
add_button = tk.Button(root, text="START", command=countdown, bg='#36648B', font=("Arial", 18))
add_button.grid(row= 3, column = 1)
add_button = tk.Button(root, text="+HOUR", command=add_time_hour, bg='#36648B', font=("Arial", 18))
add_button.grid(row= 2, column = 0)
add_button = tk.Button(root, text="+MNTS", command=add_time_min, bg='#36648B', font=("Arial", 18))
add_button.grid(row= 2, column = 1)
add_button = tk.Button(root, text="+SCND", command=add_time_sec, bg='#36648B', font=("Arial", 18))
add_button.grid(row= 2, column = 2)
add_button = tk.Button(root, text="RESET ", command=reset, bg='#36648B', font=("Arial", 18))
add_button.grid(row= 3, column = 0)
add_button = tk.Button(root, text="RST-MIN", command=add_rest_min, bg='#36648B', font=("Arial", 18))
add_button.grid(row= 2, column = 3)
add_button = tk.Button(root, text="PAUSE", command=countdown_pause, bg='#36648B', font=("Arial", 18))
add_button.grid(row= 3, column = 2)
add_button = tk.Button(root, text="RESUME", command=countdown_unpause, bg='#36648B', font=("Arial", 18))
add_button.grid(row= 3, column = 3)
root.mainloop() Top answer 1 of 4
15
pause = "No" an option is to use paused = False which is more pythonic. Glad you are having fun
2 of 4
5
You don't need the command: from tkinter import * Stay away from global imports and global variables whenever possible. Also I'd use ttk instead: from tkinter import ttk And then: button = ttk.Button(root....) ttk.Style().configure('TButton', font = ('Helvetica', 20, 'bold')) That way all your buttons will have the same style without you having to define them each time you instance them.
ProgramCreek
programcreek.com › python › example › 2317 › threading.Timer
Python Examples of threading.Timer
def start(self, instance, fields=None, restore=None, send_update=None): """ Starts a threading.Timer chain, to repeatedly update a resource instances's expirationTime. @param instance: resource instance @param fields: additional fields mandatory during update @param restore: function that will restore the instance, if it has expired accidentally. Has to restart the refresher.
Stack Overflow
stackoverflow.com › questions › 64259270 › how-to-start-timer-and-reset-it-back-in-python
How to start timer and reset it back in python? - Stack Overflow
October 8, 2020 - otherwise start timer afresh print('restart_timer') if self.start_event.is_set(): self.reset_event.set() print('restart_timer:reset') else: self.start_event.set() print('restart_timer:start') def terminate(self): print('terminate') self.terminate_event.set() class Application(Tk): def show_idle_screen(self): for widget in self.winfo_children(): widget.destroy() # Create new widget element print('idle_screen') def show_product_info(self, barcodeno): # call web api and get response # create information widget element # -Timer(5.0, self.show_idle_screen).start() # -tmr = TimerThread(timeout, slee
Python
docs.python.org › 3 › library › threading.html
threading — Thread-based parallelism — Python 3.14.4 ...
Timers are started, as with threads, by calling their Timer.start method. The timer can be stopped (before its action has begun) by calling the cancel() method.
Raspberry Pi Forums
forums.raspberrypi.com › board index › programming › python
Tkinter inactivity reset timer - Raspberry Pi Forums
I wanted to spin up some sort of ... if the timer reaches 0 the screen would reset back to my main screen for inactivity. I was looking in python at after(), but not sure how I would reset it if the user strikes a key. Also, if they do finish and move to the next screen I need to restart the countdown ...
Top answer 1 of 3
1
Try this:
import time
import keyboard
x=60
while True:
try:
if keyboard.is_pressed('space'):
x=60
print(f"Timer reset to {x}")
elif keyboard.is_pressed('space'):
break
else:
print(f"{x} seconds left")
time.sleep(1)
x-=1
except Exception:
pass
2 of 3
1
This is my suggestion. The problem is, that time.sleep is blocking, so when it's sleeping you cannot break it by pressing escape. You will have to spam the escape button, but it works.
import keyboard
import time
t=60
last = False
current = False
while True:
current = keyboard.is_pressed('space') # triggered when space bar is pressed
if last == 0 and current == 1:
while t>=0:
if keyboard.is_pressed('escape'):
t = 60
last = False
current = False
print("Timer stopped.")
break
print(t)
t-=1
time.sleep(1)
last = current # reset
Sample output/test:
60
59
58
57
56
60
59
58
57
56
60
59
60
59
58
CodeScracker
codescracker.com › python › program › python-program-shutdown-restart-computer.htm
Python Program to Shutdown and Restart Computer
Because to use + operator to concatenate two string values. That is, strOne and strTwo. The second string is the timer value entered by user. To restart your computer system using a python program, just replace the /s with /r from the program given to shutdown the system.
Python Pool
pythonpool.com › home › blog › understanding the python timer class with examples
Understanding the Python Timer Class with Examples - Python Pool
May 23, 2021 - You can export this class as a module and install it as a dependency in your code. Then by using a single line, you can import it – · import time class Timer: """ Timer class """ def __init__(self): self.start = time.time() ''' Restarts the timer.