calculadora

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from tkinter import*
root = Tk()
root.title("Primeira janela")
frame = Frame(root)
txt = Entry(frame)
txt.grid(row=0, columnspan=4)
def callback(texto):
 txt.insert(END, texto)
def calcular(calculo):
 resultado = str(eval(txt.get()))
 txt.delete(0, END)
 txt.insert(END, resultado)
def apagar(deletar):
 txt.delete(len(txt.get())-1,END)
numero1 = Button(frame, text="1", command = lambda: callback("1"))
numero1.grid(row=1, column=0, sticky=W+E+N+S)
numero2 = Button(frame, text="2", command=lambda: callback("2"))
numero2.grid(row=1, column=1, sticky=W+E+N+S)
numero3 = Button(frame, text="3", command=lambda: callback("3"))
numero3.grid(row=1, column=2, sticky=W+E+N+S)
back= Button(frame, text="<-", command=lambda: apagar("<-"))
back.grid(row=1, column=3, sticky=W+E+N+S)
numero4 = Button(frame, text="4", command=lambda: callback("4"))
numero4.grid(row=2, column=0, sticky=W+E+N+S)
numero5 = Button(frame, text="5", command=lambda: callback("5"))
numero5.grid(row=2, column=1, sticky=W+E+N+S)
numero6 = Button(frame, text="6", command=lambda: callback("6"))
numero6.grid(row=2, column=2, sticky=W+E+N+S)
menos= Button(frame, text="-", command=lambda: callback("-"))
menos.grid(row=2, column=3, sticky=W+E+N+S)
numero7 = Button(frame, text="7", command=lambda: callback("7"))
numero7.grid(row=3, column=0, sticky=W+E+N+S)
numero8 = Button(frame, text="8", command=lambda: callback("8"))
numero8.grid(row=3, column=1, sticky=W+E+N+S)
numero9 = Button(frame, text="9", command=lambda: callback("9"))
numero9.grid(row=3, column=2, sticky=W+E+N+S)
multiplicação = Button(frame, text="*", command=lambda: callback("*"))
multiplicação.grid(row=3, column=3, sticky=W+E+N+S)
numero0 = Button(frame, text="0", command=lambda: callback("0"))
numero0.grid(row=4, column=0, sticky=W+E+N+S)
ponto = Button(frame, text=".", command=lambda: callback("."))
ponto.grid(row=4, column=1, sticky=W+E+N+S)
divisão = Button(frame, text="/", command=lambda: callback("/"))
divisão.grid(row=4, column=2, sticky=W+E+N+S)
soma = Button(frame, text="+", command=lambda: callback("+"))
soma.grid(row=4, column=3, sticky=W+E+N+S)
iguladade = Button(frame, text="=", command=lambda: calcular("="))
iguladade.grid(row=5, columnspan=4, sticky=W+E+N+S)
frame.pack()
root.mainloop()