Напишите код хорошего калькулятора на Python

Новее не нашёл, пробуйfrom tkinter import *rt = Tk()rt.title("Calculator")rt.geometry("264x200")rt.configure(bg="lightblue")rt.resizable(width=False, height=False)_input = Text(rt, width=32, height=2              , font="arial 11")_input.grid(row=1, column=0, columnspan=4)class App:    def __init__(self, master):        self.master = masterdef add():    _input.insert(END, "+")def sub():    _input.insert(END, "-")def amp():    _input.insert(END, "*")def div():    _input.insert(END, "/")def n0():    _input.insert(END, "0")def n1():    _input.insert(END, "1")def n2():    _input.insert(END, "2")def n3():    _input.insert(END, "3")def n4():    _input.insert(END, "4")def n5():    _input.insert(END, "5")def n6():    _input.insert(END, "6")def n7():    _input.insert(END, "7")def n8():    _input.insert(END, "8")def n9():    _input.insert(END, "9")def clear():    _input.delete("1.0", END)def eq():    txt = _input.get("1.0", END)    clear()    _input.insert(END, eval(txt))b0 = Button(rt, bg="pink", text="0", width=8, height=2, command=n0)b1 = Button(rt, bg="pink", text="1", width=8, height=2, command=n1)b2 = Button(rt, bg="pink", text="2", width=8, height=2, command=n2)b3 = Button(rt, bg="pink", text="3", width=8, height=2, command=n3)b4 = Button(rt, bg="pink", text="4", width=8, height=2, command=n4)b5 = Button(rt, bg="pink", text="5", width=8, height=2, command=n5)b6 = Button(rt, bg="pink", text="6", width=8, height=2, command=n6)b7 = Button(rt, bg="pink", text="7", width=8, height=2, command=n7)b8 = Button(rt, bg="pink", text="8", width=8, height=2, command=n8)b9 = Button(rt, bg="pink", text="9", width=8, height=2, command=n9)add = Button(rt, bg="pink", text="+", width=8, height=2, command=add)sub = Button(rt, bg="pink", text="-", width=8, height=2, command=sub)amp = Button(rt, bg="pink", text="*", width=8, height=2, command=amp)div = Button(rt, bg="pink", text="/", width=8, height=2, command=div)eq = Button(rt, bg="pink", text="=", width=8, height=2, command=eq)c = Button(rt, bg="pink", text="C", width=8, height=2, command=clear)b0.grid(row=5, column=1)b1.grid(row=4, column=0)b2.grid(row=4, column=1)b3.grid(row=4, column=2)b4.grid(row=3, column=0)b5.grid(row=3, column=1)b6.grid(row=3, column=2)b7.grid(row=2, column=0)b8.grid(row=2, column=1)b9.grid(row=2, column=2)add.grid(row=2, column=3)sub.grid(row=3, column=3)amp.grid(row=4, column=3)div.grid(row=5, column=3)eq.grid(row=5, column=2)c.grid(row=5, column=0)rt.mainloop()