[Tkinter] After_cancel

[menator01]

I've been playing around with an earlier post. I added a reset timer to the widget. The first run through the timer works as expected but, the next run through the timer runs fast and even skips numbers at times. I can get it to work correct but then I get errors in the console. Any advice would be great. I'm trying to use the after_cancel and after_idle methods.

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#! /usr/bin/env python3   from tkinter import * from tkinter import ttk       class Picture:     def __init__(self, parent):         self.parent = parent         img = PhotoImage(file='images/img1.png')         style = ttk.Style()         style.configure('My.TLabel',padding=.25, borderwidth=5, relief='groove')         self.label = ttk.Label(self.parent, style='My.TLabel')         self.label['image'] = img         img.image = img         self.label.pack(pady=5)           btn = Button(self.parent, command=self.update, text='Test').pack(side='bottom', pady=10)           self.lab = Label(self.parent)         self.lab['text'] = ''         self.lab.pack(expand=True, fill='x')               def update(self):         img = PhotoImage(file='images/img2.png')         self.label['image'] = img         img.image = img         self.i = 8         self.timer()       def display(self):         img = PhotoImage(file='images/img1.png')         self.label['image'] = img         img.image = img         self.lab['text'] = ''           ### This will fly through the coundown on the 2nd run         # self.lab.after_cancel(self.myvar)           ### If I leave out part or all of the arguments the         ### timer works correct. Just get errors in the console         self.lab.after_cancel(self.lab.after(self.timer))           def run_timer(self):         if self.i >= 0:             self.lab['text'] = f'Resetting in {self.i}'               self.i -= 1         else:             self.display()           def timer(self):         self.run_timer()         self.myvar = self.lab.after(1000, self.timer)     def main():     root = Tk()       Picture(root)     root.mainloop()   main()

[menator01]

I got it working now with these changes. I done away with the after_cancel and just used the timer itself.

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#! /usr/bin/env python3   from tkinter import * from tkinter import ttk       class Picture:     def __init__(self, parent):         self.parent = parent         img = PhotoImage(file='images/img1.png')         style = ttk.Style()         style.configure('My.TLabel',padding=.25, borderwidth=5, relief='groove')         self.label = ttk.Label(self.parent, style='My.TLabel')         self.label['image'] = img         img.image = img         self.label.pack(pady=5)           btn = Button(self.parent, command=self.update, text='Test').pack(side='bottom', pady=10)           self.lab = Label(self.parent)         self.lab['text'] = None         self.lab.pack(expand=True, fill='x')               def update(self):         img = PhotoImage(file='images/img2.png')         self.label['image'] = img         img.image = img         self.i = 8         self.timer()       def display(self):         img = PhotoImage(file='images/img1.png')         self.label['image'] = img         img.image = img         self.lab['text'] = None             def run_timer(self):         if self.i >= 0:             self.i -= 1       def timer(self):         self.run_timer()         if self.i >= 0:             self.myvar = self.lab.after(1000, self.timer)             self.lab['text'] = f'Resetting in {self.i}'             self.lab['bg'] = 'burlywood'             self.lab['fg'] = 'brown'             self.lab['font'] = 'serif 10 normal'         else:             self.myvar = None             self.lab['text'] = ''             self.lab['bg'] = 'grey86'             self.display()       def main():     root = Tk()       Picture(root)     root.mainloop()   main()