Multi threading in Tkinter GUI, threads in different classes

Question

I\'m currently learning the Tkinter GUI programming. And I\'m stuck in somewhere in multi threading concept. Even though this topic is discussed several times here, I couldn

Answer 1

You don't need threading for something this simple.

The GUI is freezing because you're putting a time.sleep inside the function which is blocking the main thread until it's finished.

Simply use Tk's built in after method. Change your function to.

def countNum(self, num=0):
    if num < 10:
        print num
        root.after(2000, lambda: self.countNum(num + 1))
    else:
        print "Stopping after call"

The after method takes the following arguments:

after(delay_ms, callback, arguments)

The time is in milliseconds, and 1000 ms = 1 second. So, we pass 2,000 ms for a 2 second delay.