如何在运行 tkinter 主循环的同时等待循环返回值？

Question

I have created a window using tkinter and show that window using window.mainloop().

window = Tk()
..
..
window.mainloop()

This tkinter window has a button that I waiting for the user to press:

button = Button(buttonFrame, text='Next', command=pressed)

However, I also have physical button in real life that the user can press. I have a function that communicates with the physical button over USB. It just waits in a while loop for the physical button to be pressed and then returns true. So if either the physical or digital button is pressed, the "pressed" function is called.

The problem is I don't know how to wait for both at the same time. The code that waits for the USB response is blocking because it use a while loop. The main loop of tkinter is also blocking. So how can I have both waiting at the same time?

Answer 1

I was able to get it working using the threading module:

window = Tk()
..
..
thread = threading.Thread(target=myButton)
thread.start()
window.mainloop()

Inside the myButton function, I call the function to get the button press from the USB button.