calculadoraACME2

#!/usr/bin/env python
# -*- coding: utf-8 -*-
#

import tkinter as tk
from math import sqrt, factorial, pi


########## funciones ############################
def clic(tecla):
    global operacion
    operacion = operacion + tecla
    calculo.set(operacion)


def limpieza():
    global operacion
    calculo.set("0")  # borro la pantalla
    operacion = ""    # borro del lado consola


def hacer_cuenta():
    global operacion
    try:
        resultado = str(eval(operacion))
    except Exception:
        limpieza()
        resultado = "ERROR"
    calculo.set(resultado)


def borrar_caracter():
    global operacion
    operacion = operacion[:-1]
    if not operacion:
        operacion="0"
    calculo.set(operacion)



# Ventana para contener la calculadora
ventana = tk.Tk()
ventana.title("Calculadora ACME")
ventana.config(width=390, height=600, bg="Light Steel Blue")
ventana.resizable(0,0)




########### variables #################
# creo una variable para mostrar el cálculo en pantalla
calculo = tk.StringVar()

# creo la misma variable pero del lado consola
operacion = ""

# llamo a limpieza antes de empezar
limpieza()

# creo la pantalla
pantalla = tk.Entry(
                font = ("arial",18,"bold"),
                width = 20,
                bd = 20, # relieve
                bg = "powder blue",
                justify = "right",
                state = tk.DISABLED,
                textvariable = calculo
            )
pantalla.place(x=20, y=50)

# defino las dimensiones de las teclas
ancho = 10
alto = 2

#####################  TECLAS  ########################################

# tecla para borrar un caracter
b = tk.Button(text="DEL", width=ancho, height=alto, bg="medium aquamarine", command=borrar_caracter)
b.place(x=287, y=140)




##### primera fila: 1 2 3 +
b = tk.Button(text="1", width=ancho, height=alto, command=lambda:clic("1"))
b.place(x=17, y=200)
b = tk.Button(text="2", width=ancho, height=alto, command=lambda:clic("2"))
b.place(x=107, y=200)
b = tk.Button(text="3", width=ancho, height=alto, command=lambda:clic("3"))
b.place(x=197, y=200)
b = tk.Button(text="+", width=ancho, height=alto, bg="SteelBlue2", command=lambda:clic("+"))
b.place(x=287, y=200)

#### segunda fila: 4 5 6 -
b = tk.Button(text="4", width=ancho, height=alto, command=lambda:clic("4"))
b.place(x=17, y=260)
b = tk.Button(text="5", width=ancho, height=alto, command=lambda:clic("5"))
b.place(x=107, y=260)
b = tk.Button(text="6", width=ancho, height=alto, command=lambda:clic("6"))
b.place(x=197, y=260)
b = tk.Button(text="-", width=ancho, height=alto,  bg="SteelBlue2", command=lambda:clic("-"))
b.place(x=287, y=260)

##### tercera fila: 7 8 9 x
b = tk.Button(text="7", width=ancho, height=alto, command=lambda:clic("7"))
b.place(x=17, y=320)
b = tk.Button(text="8", width=ancho, height=alto, command=lambda:clic("8"))
b.place(x=107, y=320)
b = tk.Button(text="9", width=ancho, height=alto, command=lambda:clic("9"))
b.place(x=197, y=320)
b = tk.Button(text="x", width=ancho, height=alto, bg="SteelBlue2", command=lambda:clic("*"))
b.place(x=287, y=320)

#### cuarta fila: ( 0 ) /
b = tk.Button(text="(", width=ancho, height=alto, bg="sky blue", command=lambda:clic("("))
b.place(x=17, y=380)
b = tk.Button(text="0", width=ancho, height=alto, command=lambda:clic("0"))
b.place(x=107, y=380)
b = tk.Button(text=")", width=ancho, height=alto, bg="sky blue", command=lambda:clic(")"))
b.place(x=197, y=380)
b = tk.Button(text="/", width=ancho, height=alto, bg="SteelBlue2", command=lambda:clic("/"))
b.place(x=287, y=380)

##### quinta fila: raiz coma decimal potencia resto
b = tk.Button(text="\u221A", width=ancho, height=alto, bg="sky blue", command=lambda:clic("sqrt("))
b.place(x=17, y=440)
b = tk.Button(text=".", width=ancho, height=alto, command=lambda:clic("."))
b.place(x=107, y=440)
b = tk.Button(text="Pot", width=ancho, height=alto, bg="sky blue", command=lambda:clic("**"))
b.place(x=197, y=440)
b = tk.Button(text="%", width=ancho, height=alto, bg="SteelBlue2", command=lambda:clic("%"))
b.place(x=287, y=440)

#### sexta fila: Clear Factorial pi =
b = tk.Button(text="CL", width=ancho, height=alto, bg="medium aquamarine", command=limpieza)
b.place(x=17, y=500)
b = tk.Button(text="!", width=ancho, height=alto, command=lambda:clic("factorial("))
b.place(x=107, y=500)
b = tk.Button(text="\u03C0", width=ancho, height=alto, bg="sky blue", command=lambda:clic(str(pi)))
b.place(x=197, y=500)
b = tk.Button(text="=", width=ancho, height=alto, bg="medium aquamarine", command=hacer_cuenta)
b.place(x=287, y=500)



ventana.mainloop()