cal

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

# Script que implementa una calculadora científica básica

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


def clic(tecla):
    global calculo
    calculo = calculo + str(tecla)
    texto_ingresado.set(calculo)


def limpieza():
    global calculo
    calculo = ""
    texto_ingresado.set("0")

def calcular():
    global calculo
    try:
        total = str(eval(calculo))
    except Exception:
        total = "ERROR"
    texto_ingresado.set(total)



# creo la ventana de la calculadora
ventana = tk.Tk()
ventana.title("CALCULADORA")
ventana.config(width = 390, height = 600, bg = "Light Steel Blue")
ventana.resizable(0,0)

# variable que almacena el contenido de la pantalla
texto_ingresado = tk.StringVar()

# creo dos variables para almacenar el ancho y alto de los botones
ancho = 10
alto = 2

# creo una variable para almacenar el cálculo con la secuencia
# de tecleo
calculo = ""

limpieza()




########## creamos los botones de la calculadora  ####################

# fila 1: 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)
boton_suma = tk.Button(text="+", width=ancho, height=alto, bg="pale green", command=lambda:clic('+'))
boton_suma.place(x=287, y=180)

# fila 2: 1,2,3,+
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)
boton_menos = tk.Button(text="-", width=ancho, height=alto, bg="pale green", command=lambda:clic('-'))
boton_menos.place(x=287, y=240)

# fila 3: 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)
boton_por = tk.Button(text="x", width=ancho, height=alto, bg="pale green", command=lambda:clic('*'))
boton_por.place(x=287, y=300)

# fila 4: (,0,),/
boton_par_izq = tk.Button(text="(", width=ancho, height=alto, bg="pale green", command=lambda:clic('('))
boton_par_izq.place(x=17, y=360)
boton0 = tk.Button(text="0", width=ancho, height=alto, command=lambda:clic(0))
boton0.place(x=107, y=360)
boton_par_der = tk.Button(text=")", width=ancho, height=alto, bg="pale green", command=lambda:clic(')'))
boton_par_der.place(x=197, y=360)
boton_cociente = tk.Button(text="/", width=ancho, height=alto, bg="pale green", command=lambda:clic('/'))
boton_cociente.place(x=287, y=360)

# fila 5: raiz,coma decimal,potencia,resto
boton_raiz = tk.Button(text="RAIZ", width=ancho, height=alto, bg="pale green",command=lambda:clic('sqrt('))
boton_raiz.place(x=17, y=420)
boton_punto = tk.Button(text=".", width=ancho, height=alto, command=lambda:clic('.'))
boton_punto.place(x=107, y=420)
boton_power = tk.Button(text="POW", width=ancho, height=alto, bg="pale green",command=lambda:clic('**'))
boton_power.place(x=197, y=420)
boton_resto = tk.Button(text="%", width=ancho, height=alto, bg="pale green", command=lambda:clic('%'))
boton_resto.place(x=287, y=420)

# fila 6: Clear, Factorial, pi, igual
boton_clear = tk.Button(text="CLEAR", width=ancho, height=alto, bg="SkyBlue3", command=limpieza)
boton_clear.place(x=17, y=480)
boton_fact = tk.Button(text="!", width=ancho, height=alto, bg="pale green", command=lambda:clic('factorial('))
boton_fact.place(x=107, y=480)
boton_pi = tk.Button(text="PI", width=ancho, height=alto, bg="pale green", command=lambda:clic('pi'))
boton_pi.place(x=197, y=480)
boton_igual = tk.Button(text="=", width=ancho, height=alto, bg="SkyBlue3", command=calcular)
boton_igual.place(x=287, y=480)


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





ventana.mainloop()