Run an infinite loop in the backgroung in Tkinter

loops, python, tkinter

Solution

It is a little unclear what your code at the top is supposed to do, however, if you just want to call a function every second (or every the amount of seconds you want), you can use the `after` method.

So, if you just want to do something with `textOne`, you'd probably do something like:

...
textOne = Entry(self, width=2)
textOne.x = 0

def increment_textOne():
    textOne.x += 1

    # register "increment_textOne" to be called every 1 sec
    self.after(1000, increment_textOne)

You could make this function a method of your class (in this case I called it `callback`), and your code would look like this:

class Foo(Frame):

    def __init__(self, master=None):
        Frame.__init__(self, master)
        self.x = 0
        self.id = self.after(1000, self.callback)

    def callback(self):
        self.x += 1
        print(self.x)
        #You can cancel the call by doing "self.after_cancel(self.id)"
        self.id = self.after(1000, self.callback)  

gui = Foo()
gui.mainloop()

Problem

I would like the code to run in the background and to update my GUI periodically. How can I accomplish this? For example, suppose I want to execute something like this in the background of the GUI code you can see below: ``` x = 0 while True: print(x) x = x + 1 time.sleep(1) ``` This is the GUI code: ``` class GUIFramework(Frame): def __init__(self,master=None): Frame.__init__(self,master) self.master.title("Volume Monitor") self.grid(padx=10, pady=10,sticky=N+S+E+W) self.CreateWidgets() def CreateWidgets(self): textOne = Entry(self, width=2) textOne.grid(row=1, column=0) listbox = Listbox(self,relief=SUNKEN) listbox.grid(row=5,rowspan=2,column=0,columnspan=4,sticky=N+W+S+E,pady=5) listbox.insert(END,"This is an alert message.") if __name__ == "__main__": guiFrame = GUIFramework() guiFrame.mainloop() ```

Original source