Изучение библиотеки Tkinter calculator | Python

код: import tkinter as tk win = tk.Tk() win.geometry("800x600+500+200") win.resizable(False, False) win.title("регистрация") win["bg"] = "#23c28a" def btnn1(): a = int(entry1.get()) b = int(entry2.get()) c = a - b d = a + b e = a * b f = a / b label3["text"] = int(c) label4["text"] = int(d) label5["text"] = int(e) label6["text"] = int(f) label1 = tk.Label(win,text="Введите первое число",width=20, font="Arial 15 bold", bg="#23c28a") label1.pack() entry1 = tk.Entry(win, width=25, font="Arial 15 bold") entry1.pack() label2 = tk.Label(win,text="Введите второе число",width=20, font="Arial 15 bold", bg="#23c28a") label2.pack() entry2 = tk.Entry(win, width=25, font="Arial 15 bold") entry2.pack() label3 = tk.Label(win,text="",width=20, font="Arial 15 bold", bg="#23c28a") label3.pack() label4 = tk.Label(win,text="",width=20, font="Arial 15 bold", bg="#23c28a") (label4.pack()) label5 = tk.Label(win,text="",width=20, font="Arial 15 bold", bg="#23c28a") label5.pack() label6 = tk.Label(win,text="",width=20, font="Arial 15 bold", bg="#23c28a") label6.pack() btn1 = tk.Button(win, text="узнать ответ",width=25, font="Arial 15 bold", bg="#23c28a", command=btnn1) btn1.pack() win.mainloop()