import random as r
def sai():
la["text"] = r.randint(1, 6)
root = tk.Tk()
root.title("sai")
root.geometry("200x200")
root["bg"] = "blue"
fnt = ("ゴシック", 100)
la = tk.Label(text = 1, font = fnt, bg = "blue", fg = "white")
la.pack()
bu = tk.Button(text = "サイコロ", command = sai)
bu.pack()
root.mainloop()