how to update values in tkinter
import tkinter as tk
win = tk.Tk()
max_amount = 0
label1 = None #just so it is defined
def fun():
global max_amount, label1
max_amount +=100
label1.configure(text='Balance :$' + str(max_amount))
btn = tk.Button(win,text = 'Change', command = fun)
btn.grid()
t1 =str(max_amount)
label1 = tk.Label(win,text = 'Balance :$' + t1)
label1.grid()
win.mainloop()