Creating and destroying dynamic labels in Tkinter

[Yoriz]

Don't use exec use a dictionary

import tkinter as tk
from functools import partial

root = tk.Tk()
root_2 = tk.Tk()

labels = {}


def function(number):
    if number not in labels.keys():
        label = tk.Label(root_2, text=f'On{number}')
        label.pack()
        labels[number] = label
    else:
        label = labels.pop(number)
        label.destroy()


for number in range(20):
    switch = tk.Button(
        root, text=f'On{number}', command=partial(function, number))
    switch.pack()

root.mainloop()