Two concurrent threads using tkinter and threading-CodePudding

I am trying to have two buttons to perform two independent functions in a Tkinter GUI both of them runnning concurrently. I am unable to understand how do I implement the same. I tried to base this from many tutorials and this is still sequential for some reason. Any and all help is appreciated. Thanks!

from tkinter import *
import threading

window = Tk()
window.geometry("500x200 460 170")
window.resizable(0, 0)
window.configure(bg='#030818')

screen_size = (61366, 78)

def opencv_code():
    print("recorder")
    time.sleep(10)

def knob_tracking():
    print("recorder1")

def start_opencv():
    threading.Thread(target=opencv_code()).start()

def start_knob_tracking():
    threading.Thread(target=knob_tracking()).start()

Label(window, text="Microscope", fg="white",bg="#030818",font=("Helvetica", 23, "bold")).pack()
Button(window, text="Recorder", command=start_opencv, bd=0, bg="gray",fg="white",font=("Helvetica", 15, "bold")).place(x=170,y=60)
Button(window, text="Recorder1", command=start_knob_tracking, bd=0, bg="gray",fg="white",font=("Helvetica", 15, "bold")).place(x=170,y=110)

window.mainloop()```

CodePudding user response：

You need to remove the parentheses from the functions you pass to threading, as what you are doing calls the functions, instead of passing the function handle. So change:

def start_opencv():
    threading.Thread(target=opencv_code()).start()

def start_knob_tracking():
    threading.Thread(target=knob_tracking()).start()

to:

def start_opencv():
    threading.Thread(target=opencv_code).start()

def start_knob_tracking():
    threading.Thread(target=knob_tracking).start()

You can verify that this is working correctly by changing the functions to:

def opencv_code():
    print("recorder")
    time.sleep(10)
    print("recorder again")

def knob_tracking():
    print("recorder1")
    time.sleep(5)
    print("recorder1 again")

And pressing both buttons.