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Scheduling Updates in Tkinter for Clock Applications
Tkinter, a popular Python GUI library, provides the ability to create custom graphical user interfaces. One common requirement in GUIs is the display of a clock-like element that updates itself regularly. However, using the time.sleep() method within a loop can freeze the GUI. This article explores how to create a clock in Tkinter and schedule its updates effectively.
Using Tkinter's 'after' Method
Tkinter's root windows offer an 'after' method that allows the scheduling of functions to be called after a specified time period. By using this method recursively, it is possible to create an automatically recurring event.
Example Code
import Tkinter as tk import time class App(): def __init__(self): self.root = tk.Tk() self.label = tk.Label(text="") self.label.pack() self.update_clock() self.root.mainloop() def update_clock(self): now = time.strftime("%H:%M:%S") self.label.configure(text=now) self.root.after(1000, self.update_clock) app=App()
In this example, the 'update_clock' method is called after every 1000 milliseconds (1 second), resulting in the clock being updated in real-time.
Limitations
It is important to note that the 'after' method does not guarantee that the scheduled function will execute exactly on time. Tkinter's single-threaded nature means that the app may experience delays if it is busy. However, these delays are typically very brief, measured in microseconds.
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