from tkinter import *
from random import randint
def roll () :
    text.delete(0.0, END)
    text.insert(END, str(randint(1,6)))
window = Tk()
text = Text(window, width=1, height=1)
buttonA = Button(window, text='Нажми чтобы кинуть!', command=roll)
text.pack()
buttonA.pack()
window.mainloop()