python - Time delay Tkinter

Question

I'd like to make a graphic window in PyDev (Eclipse) python 2.75.

I've done few things but I'd like to make an "entrance" "blink". It's Tests the user input. If it's an integer it should blink green for a second, and then turn into white. But if it's a string of something else it should blink red, and then turn into white. I've used a time.sleep() but it doesn't work as I'd like to.

Here is my code for this action:

def sprawdzam():

    z = e.get()
    try:
        z = int(z)
        e.config(bg = 'green')
        time.sleep(2)
        e.config(bg = 'white')    

    except:
        l.config(bg = 'red')
        time.sleep(2)
        e.config(bg = 'white')

Answer 1

time.sleep blocks the execution of the program.

Use after.

For example:

from Tkinter import *

def blink():
    e.config(bg='green')
    e.after(1000, lambda: e.config(bg='white')) # after 1000ms

root = Tk()
e = Entry(root)
e.pack()
b = Button(root, text='blink', command=blink)
b.pack()
root.mainloop()