""" What I want: A little window to open with a 0 in it. Every second, the 0 should increment by 1. What I get: A one second delay, see the window with a 1 in it, and then nothing appears to happen. Never see the 0, never see a 2. Any quick clues? Thanks. Nick. (Python 2.4, Win98).
Your run() method doesn't loop, so it only updates once. But there is a fundamental problem; the run() method is called before you even start Tkinter by calling mainloop(). That's why you never see the 0. If you change run to loop forever, it won't return and you will never even get to the mainloop() call.
Tkinter supports timed, asynchronous callbacks. Here is a program that uses a callback to display a ticker:
from Tkinter import *
count = 0
def update():
''' Callback method updates the label '''
global count
count += 1
label.configure(text=str(count)) # Schedule another callback
root.after(1000, update)
root=Tk() label=Label(root,text="0") label.pack()
b=Button(root,text="Bye",command='exit') b.pack()
# Schedule the initial callback root.after(1000, update)
root.mainloop()
Kent
"""
from Tkinter import * from time import sleep
class Clock: def __init__(self, parent): self.time = 0 self.display = Label(parent) self.display["font"] = "Arial 16" self.display["text"] = str(self.time) self.display.pack()
def run(self): #also tried self,parent sleep(1.0) self.time = self.time + 1 self.display["text"] = str(self.time)
win = Tk() app = Clock(win) app.run() #also tried run(win) with self,parent above win.mainloop()
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