Basic_Calculator.py

from tkinter import *

def button_press(num):
    global equation_text
    
    equation_text = equation_text + str(num)
    
    equation_label.set(equation_text)
    
def equal():
    try:
        global equation_text
        
        total= str(eval(equation_text))
        
        equation_label.set(total)
        
        equation_text = total
    except ZeroDivisionError:
        equation_label.set('Cannot Divide by Zero')
        equation_text = ""
        
    except SyntaxError:
        equation_label.set('Syntax Error')
        equation_text= ""
    
def clear():
    global equation_text
    
    equation_text = ""
    equation_label.set(equation_text)
    
window= Tk()
window.geometry("500x500")

#variables
equation_text = " "
equation_label = StringVar()


label= Label(window, textvariable= equation_label, font= ('Arial', 10), bg= 'white', width= 24, height= 2)
label.pack()

frame = Frame(window)
frame.pack()

#buttons
button1 = Button(frame, text= 1, 
font= ('Arial', 3), 
height= 4, width= 9,
command= lambda: button_press(1))

button1.grid(row=0, column=0)

button2 = Button(frame, text= 2, 
font= ('Arial', 3), 
height= 4, width= 9,
command= lambda: button_press(2))

button2.grid(row=0, column=1)


button3 = Button(frame, text= 3, 
font= ('Arial', 3), 
height= 4, width= 9,
command= lambda: button_press(3))

button3.grid(row=0, column=2)


button4 = Button(frame, text= 4, 
font= ('Arial', 3), 
height= 4, width= 9,
command= lambda: button_press(4))

button4.grid(row=1, column=0)


button5 = Button(frame, text= 5, 
font= ('Arial', 3), 
height= 4, width= 9,
command= lambda: button_press(5))

button5.grid(row=1, column=1)


button6 = Button(frame, text= 6, 
font= ('Arial', 3), 
height= 4, width= 9,
command= lambda: button_press(6))

button6.grid(row=1, column=2)


button7 = Button(frame, text= 7, 
font= ('Arial', 3), 
height= 4, width= 9,
command= lambda: button_press(7))

button7.grid(row=2, column=0)


button8 = Button(frame, text= 8, 
font= ('Arial', 3), 
height= 4, width= 9,
command= lambda: button_press(8))

button8.grid(row=2, column=1)


button9 = Button(frame, text= 9, 
font= ('Arial', 3), 
height= 4, width= 9,
command= lambda: button_press(9))

button9.grid(row=2, column=2)


button0 = Button(frame, text= 0, 
font= ('Arial', 3), 
height= 4, width= 9,
command= lambda: button_press(0))

button0.grid(row=3, column=0)


plus = Button(frame, text= '+', 
font= ('Arial', 3), 
height= 4, width= 9,
command= lambda: button_press('+'))

plus.grid(row=0, column=3)


minus = Button(frame, text= '-', 
font= ('Arial', 3), 
height= 4, width= 9,
command= lambda: button_press('-'))

minus.grid(row=1, column=3)


divide = Button(frame, text= '/', 
font= ('Arial', 3), 
height= 4, width= 9,
command= lambda: button_press('/'))

divide.grid(row=2, column=3)


multiply = Button(frame, text= '*', 
font= ('Arial', 3), 
height= 4, width= 9,
command= lambda: button_press('*'))

multiply.grid(row=3, column=3)


equal = Button(frame, text= '=', 
font= ('Arial', 3), 
height= 4, width= 9,
command= equal)

equal.grid(row=3, column=2)


decimal = Button(frame, text= '.', 
font= ('Arial', 3), 
height= 4, width= 9,
command= lambda: button_press('.'))

decimal.grid(row=3, column=1)


clear = Button(frame, text= 'clear', 
font= ('Arial', 3), 
height= 4, width= 68,
command= clear)

clear.grid(row=4, columnspan=4)




window.mainloop()