[Python] How to return a variable from a Tkinter button command function?

I am trying to make a button that increments a variable with Tkinter, but when I 'call' (I know it isn't really calling) a function with command, i can not use return variable, as there is nowhere to return the variable to. Are there alternative ways to do this? Here is my code:

import tkinter as tk

variable = 0

root = tk.Tk()


def variable_incrementer():
global variable
variable += 1
# Not return here


click_btn = tk.Button(root, text="Click me", command=variable_incrementer)
click_btn.pack()

root.mainloop()

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