Python calculator app

python calculator program project tutorial example explained

#python #calculator #program

# ****************************************************************
# Python Calculator
# ****************************************************************
from tkinter import *

def button_press(num):

global equation_text

equation_text = equation_text + str(num)

equation_label.set(equation_text)

def equals():

global equation_text

try:

total = str(eval(equation_text))

equation_label.set(total)

equation_text = total

except SyntaxError:

equation_label.set("syntax error")

equation_text = ""

except ZeroDivisionError:

equation_label.set("arithmetic error")

equation_text = ""

def clear():

global equation_text

equation_label.set("")

equation_text = ""


window = Tk()
window.title("Calculator program")
window.geometry("500x500")

equation_text = ""

equation_label = StringVar()

label = Label(window, textvariable=equation_label, font=('consolas',20), bg="white", width=24, height=2)
label.pack()

frame = Frame(window)
frame.pack()

button1 = Button(frame, text=1, height=4, width=9, font=35,
command=lambda: button_press(1))
button1.grid(row=0, column=0)

button2 = Button(frame, text=2, height=4, width=9, font=35,
command=lambda: button_press(2))
button2.grid(row=0, column=1)

button3 = Button(frame, text=3, height=4, width=9, font=35,
command=lambda: button_press(3))
button3.grid(row=0, column=2)

button4 = Button(frame, text=4, height=4, width=9, font=35,
command=lambda: button_press(4))
button4.grid(row=1, column=0)

button5 = Button(frame, text=5, height=4, width=9, font=35,
command=lambda: button_press(5))
button5.grid(row=1, column=1)

button6 = Button(frame, text=6, height=4, width=9, font=35,
command=lambda: button_press(6))
button6.grid(row=1, column=2)

button7 = Button(frame, text=7, height=4, width=9, font=35,
command=lambda: button_press(7))
button7.grid(row=2, column=0)

button8 = Button(frame, text=8, height=4, width=9, font=35,
command=lambda: button_press(8))
button8.grid(row=2, column=1)

button9 = Button(frame, text=9, height=4, width=9, font=35,
command=lambda: button_press(9))
button9.grid(row=2, column=2)

button0 = Button(frame, text=0, height=4, width=9, font=35,
command=lambda: button_press(0))
button0.grid(row=3, column=0)

plus = Button(frame, text='+', height=4, width=9, font=35,
command=lambda: button_press('+'))
plus.grid(row=0, column=3)

minus = Button(frame, text='-', height=4, width=9, font=35,
command=lambda: button_press('-'))
minus.grid(row=1, column=3)

multiply = Button(frame, text='*', height=4, width=9, font=35,
command=lambda: button_press('*'))
multiply.grid(row=2, column=3)

divide = Button(frame, text='/', height=4, width=9, font=35,
command=lambda: button_press('/'))
divide.grid(row=3, column=3)

equal = Button(frame, text='=', height=4, width=9, font=35,
command=equals)
equal.grid(row=3, column=2)

decimal = Button(frame, text='.', height=4, width=9, font=35,
command=lambda: button_press('.'))
decimal.grid(row=3, column=1)

clear = Button(window, text='clear', height=4, width=12, font=35,
command=clear)
clear.pack()

window.mainloop()

# ****************************************************************

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