#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
import tkinter as tk
from math import sqrt, factorial, pi

ventana = tk.Tk()
ventana.config(width=400, height=600, bg="Light Steel Blue")
ventana.title("Calculadora")
ventana.resizable(0,0)

def limpieza():
    global operador
    ingresa_texto.set("0")
    operador =""

def clic(tecla):
    global operador
    operador = operador + str(tecla)
    ingresa_texto.set(operador)

def operacion():
    global operador
    try:
        total = str(eval(operador))
    except:
        limpieza()
        total = "ERROR"
    ingresa_texto.set(total)

######  Programa principal  #####################

# dimensiones de las teclas
ancho = 10
alto = 3
# variable para hacer la operacion matematica
operador = ""
# variable para mostrar en pantalla de la calculadora
ingresa_texto = tk.StringVar()

limpieza()


# pantalla
pantalla = tk.Entry(
                    font = ['arial',20,'bold'],
                    width = 22,
                    textvariable = ingresa_texto,
                    bd=18,
                    bg="powder blue",
                    justify="right",
                    state=tk.DISABLED
                    )
pantalla.place(x=10,y=60)

# primer fila de teclas: 1 2 3 +
boton1 = tk.Button(text="1", width=ancho, height=alto, command=lambda:clic(1))
boton1.place(x=17,y=180)
boton2 = tk.Button(text="2", width=ancho, height=alto, command=lambda:clic(2))
boton2.place(x=107,y=180)
boton3 = tk.Button(text="3", width=ancho, height=alto, command=lambda:clic(3))
boton3.place(x=197,y=180)
botonSuma = tk.Button(text="+", width=ancho, height=alto, command=lambda:clic("+"))
botonSuma.place(x=287,y=180)

# segunda fila de teclas: 4 5 6 -
boton4 = tk.Button(text="4", width=ancho, height=alto, command=lambda:clic(4))
boton4.place(x=17,y=240)
boton5 = tk.Button(text="5", width=ancho, height=alto, command=lambda:clic(5))
boton5.place(x=107,y=240)
boton6 = tk.Button(text="6", width=ancho, height=alto, command=lambda:clic(6))
boton6.place(x=197,y=240)
botonResta = tk.Button(text="-", width=ancho, height=alto, command=lambda:clic("-"))
botonResta.place(x=287,y=240)

# tercera fila de teclas: 7 8 9 x
boton7 = tk.Button(text="7", width=ancho, height=alto, command=lambda:clic(7))
boton7.place(x=17,y=300)
boton8 = tk.Button(text="8", width=ancho, height=alto, command=lambda:clic(8))
boton8.place(x=107,y=300)
boton9 = tk.Button(text="9", width=ancho, height=alto, command=lambda:clic(9))
boton9.place(x=197,y=300)
botonPor = tk.Button(text="x", width=ancho, height=alto, command=lambda:clic("*"))
botonPor.place(x=287,y=300)

# cuarta fila de teclas: ( 0 ) /
botonParIz = tk.Button(text="(", width=ancho, height=alto, command=lambda:clic("("))
botonParIz.place(x=17,y=360)
boton0 = tk.Button(text="0", width=ancho, height=alto, command=lambda:clic(0))
boton0.place(x=107,y=360)
botonParDer = tk.Button(text=")", width=ancho, height=alto, command=lambda:clic(")"))
botonParDer.place(x=197,y=360)
botonDiv = tk.Button(text="/", width=ancho, height=alto, command=lambda:clic("/"))
botonDiv.place(x=287,y=360)

# quinta fila de teclas: Raiz Coma Potencia %
botonRaiz = tk.Button(text="RAIZ", width=ancho, height=alto, command=lambda:clic('sqrt('))
botonRaiz.place(x=17,y=420)
botonComa = tk.Button(text=".", width=ancho, height=alto, command=lambda:clic("."))
botonComa.place(x=107,y=420)
botonPot = tk.Button(text="POWER", width=ancho, height=alto, command=lambda:clic("**"))
botonPot.place(x=197,y=420)
botonResto = tk.Button(text="%", width=ancho, height=alto, command=lambda:clic("%"))
botonResto.place(x=287,y=420)

# sexta fila de teclas: Clear Factorial PI =
botonClear = tk.Button(text="CL", width=ancho, bg="cadet blue",height=alto, command=limpieza)
botonClear.place(x=17,y=480)
botonFact = tk.Button(text="!", width=ancho, height=alto, command=lambda:clic('factorial('))
botonFact.place(x=107,y=480)
botonPI = tk.Button(text="PI", width=ancho, height=alto, command=lambda:clic(pi))
botonPI.place(x=197,y=480)
botonIgual = tk.Button(text="=", width=ancho, bg="cadet blue",height=alto, command=operacion)
botonIgual.place(x=287,y=480)



ventana.mainloop()