Flashing Tkinter Labels

I'm a beginner programmer in python and have recently began using tkinter though I have come across a problem which I can't solve. Basically I have two entry boxes. Entry1 = messa

Solution 1:

The basic idea is to create a function that does the flash (or half of a flash), and then use after to repeatedly call the function for as long as you want the flash to occur.

Here's an example that switches the background and foreground colors. It runs forever, simply because I wanted to keep the example short. You can easily add a counter, or a stop button, or anything else you want. The thing to take away from this is the concept of having a function that does one frame of an animation (in this case, switching colors), and then scheduling itself to run again after some amount of time.

import Tkinter as tk

classExample(tk.Frame):
    def__init__(self, parent):
        tk.Frame.__init__(self, parent)
        self.label = tk.Label(self, text="Hello, world", 
                              background="black", foreground="white")
        self.label.pack(side="top", fill="both", expand=True)
        self.flash()

    defflash(self):
        bg = self.label.cget("background")
        fg = self.label.cget("foreground")
        self.label.configure(background=fg, foreground=bg)
        self.after(250, self.flash)

if __name__ == "__main__":
    root = tk.Tk()
    Example(root).pack(fill="both", expand=True)
    root.mainloop()