如何在 tkinter window 打开时运行 while 循环？

Question

I have a while loop that I want to run while the Tkinter window is open but the Tkinter window doesn't even open when the while loop is running.

This is a problem since my while loop is an infinite loop.

I basically want to create a programme that provides the users with new choices after a previous choice is selected by updating the buttons through a while loop, but whenever I use a while loop Tkinter doesn't open the window until I end the loop.

root = Tk()
i=0
while i==0:
    def choice1():
        list1[a1].implement()
        list1.remove(list1[a1])
    def choice2():
        list2[a2].implement()
        list2.remove(list2[a2])

button1 = tk.Button(root, text=list1.headline, command=choice1)
button2 = tk.Button(root, text=list2.headline, command =choice2)
root.mainloop()

Also, an error shows up because tkinter keeps executing this loop until there are no items in list1 or list2 left.

What I want to know is if there is a way to run Tkinter window while the while loop is going on

( a1 and a2 are randomly generated numbers.)

Answer 1

You should probably put root.mainloop in the loop, otherwise it will never execute. If mainloop() doesn't execute, the window won't stay open.

And also: you need to call the functions, defining them isn't enough. So instead of in the loop only having the def choice1() and def choice2() you need to also have choice1() and choice2() in the loop, otherwise it won't execute those commands.

And one more thing: you need to pack() the buttons, so add the lines button1.pack() and button2.pack() . The buttons also need to be before the loop, which means your def choice1() and def choice2() need to be before the loop also. (The buttons will never show up otherwise)

Answer 2

The mainloop() is the main reason for the window to be displayed continuously. When the while loop is running, the mainloop() does not get executed until the while loop ends. And because in your case the while loop never ends, the code including the mainloop() keeps waiting for its turn to be executed.

To overcome this issue you will have to put all the widgets you want to be displayed in the window along with the mainloop() inside the while loop

Like this:

import tkinter as tk

root = tk.Tk()

i = 0

while i == 0:

    def choice1():
        list1[a1].implement()
        list1.remove(list1[a1])

    def choice2():
        list2[a2].implement()
        list2.remove(list2[a2])


    button1 = tk.Button(root, text=list1.headline, command=choice1)
    button2 = tk.Button(root, text=list2.headline, command=choice2)

    root.mainloop()