[PyGUI] Python 3.8.1 Tkinter Widget stete change

[sasiap]

Thank You Larz60+!
I'm new in python.
You are right about the incomprehensibility of what I wrote.
I try to simplify:

from tkinter import *

import math
import numpy as np

# omissis...

def verifica(event=None):
    val1 = v1.get() * int(e1.get()) * 50
    val2 = v2.get() * int(e2.get()) * 20
    val3 = v3.get() * int(e3.get()) * 10
    val4 = v4.get() * int(e4.get()) * 5
    print (val1,val2,val3,val4)
    somma=val1+val2+val3+val4
    print (somma)
    valtot=int(e0.get())    
    if somma > valtot:
       b0.config(state = 'disabled') #<--- this doesn't work!!!
    else:
       b0.config(state=NORMAL) #<--- this doesn't work!!!


b0 = Button(gui, text="Split", state='normal', command=callback).place(x=100, y=155, height=20, width=100)
b1 = Checkbutton(gui, text="fix", state='disabled', variable=v1, command=verifica).place(x=210, y=35, height=20, width=100)

The problem lies in the fact that once the widgets (in this case b0 and b1) are set, I can no longer change their state (normal / disabled).
Have a nice day!