Calcola Radice Quadrata GUI

from tkinter import *
import math

def calcola():
    numero = float(n.get())
    risultato = "Risultato: " + str(math.sqrt(numero))
    output.configure(text=risultato)

def pulisci():
    n.delete(0, END)
    output.config(text="")


window = Tk()
window.title("Calcola Radice Quadrata")
window.geometry("400x200")
window.resizable(False, False)
window.config(bg='lightblue')

# ----------------------------------------------------------------------------------------------------------------------
alta = Frame(window, bg='lightblue')
alta.pack()

testo = Label(alta, text="Calcola Radice Quadrata", bg='lightblue', font="Arial 14 bold")
testo.grid(column=0, row=0, columnspan=2, padx=5, pady=5)

text1 = Label(alta, text="Inserisci il numero: ", bg='lightblue')
text1.grid(column=0, row=1, sticky=W, padx=5)

n = Entry(alta, width=15)
n.focus_set()
n.grid(column=1, row=1, padx=5, pady=5)

# ----------------------------------------------------------------------------------------------------------------------
bassa = Frame(window, bg='lightblue')
bassa.pack(pady=5)

calcola = Button(bassa, text="CALCOLA", bg='cyan', command=calcola)
calcola.grid(column=0, row=0, sticky=W, padx=5, pady=5)

pulisci = Button(bassa, text="PULISCI", bg='cyan', command=pulisci)
pulisci.grid(column=1, row=0, sticky=W, padx=5, pady=5)

esci = Button(bassa, text="ESCI", bg='cyan', command=quit)
esci.grid(column=2, row=0, sticky=W, padx=5, pady=5)

# ----------------------------------------------------------------------------------------------------------------------
zona_output = Frame(window, bg='lightblue')
zona_output.pack()

output = Label(zona_output, text="", bg='lightblue')
output.grid(column=0, row=0)

window.mainloop()