from tkinter import *
#__________VENTANA_____________
ven = Tk()
ven.title("Calculadora")
#_________INPUT_________________
calculo=StringVar()
calculo.set("")
calculocaja = Entry(ven,textvariable=calculo)
calculocaja.grid(row=1, columnspan=6,sticky=W+E)
#________BOTONES___________________
bt1 = Button(ven,text="1", command=1, width=5 , height=2)
bt1.grid(row=3, column=0)
bt4 = Button(ven,text="4", command=4 , width=5 , height=2)
bt4.grid(row=4, column=0)
bt7 = Button(ven,text="7", command=7, width=5 , height=2)
bt7.grid(row=5, column=0)
bt0 = Button(ven,text="0", command=0, width=5 , height=2)
bt0.grid(row=6, column=0)
bt2 = Button(ven,text="2", command=2, width=5 , height=2)
bt2.grid(row=3, column=1)
bt5 = Button(ven,text="5", command=5, width=5 , height=2)
bt5.grid(row=4, column=1)
bt8 = Button(ven,text="8", command=8, width=5 , height=2)
bt8.grid(row=5, column=1)
btlimpiar = Button(ven,text="Limpiar", command=quit, width=5 , height=2)
btlimpiar.grid(row=6, column=1)
bt3 = Button(ven,text="3", command=3, width=5 , height=2)
bt3.grid(row=3, column=3)
bt6 = Button(ven,text="6", command=6, width=5 , height=2)
bt6.grid(row=4, column=3)
bt9 = Button(ven,text="9", command=9, width=5 , height=2)
bt9.grid(row=5, column=3)
bt0 = Button(ven,text="=", command=0, width=5 , height=2)
bt0.grid(row=6, column=3)
btmas = Button(ven,text="+", command=quit, width=5 , height=2)
btmas.grid(row=3, column=4)
btmenos = Button(ven,text="-", command=quit, width=5 , height=2)
btmenos.grid(row=4, column=4)
btpor = Button(ven,text="*", command=quit, width=5 , height=2)
btpor.grid(row=5, column=4)
btentre = Button(ven,text="/", command=quit, width=5 , height=2)
btentre.grid(row=6, column=4)
ven.mainloop()
