Python Calculator Using Tkinter Source Code

How To Create A Calculator In Python and Tkinter

In This Python Tutorial we will See How To Make A Simple Windows Form Calculator Application To Do The Basic Operations (+, -, /, *) And Reset To Make Another  Calc Using tkinter In Visual Code Editor .

Project Source Code:

   

import tkinter as tk

from tkinter import *

from tkinter import ttk

from tkinter.ttk import *

root = Tk()

buttons = []

btns_vals = {'0-0':'1','0-1':'2','0-2':'3','0-3':'4',

'1-0':'5','1-1':'6','1-2':'7','1-3':'8',

'2-0':'9','2-1':'0','2-2':'.','2-3':'=',

'3-0':'+','3-1':'-','3-2':'/','3-3':'*',}

textbox = tk.Entry(root, width="30", font=("Arial",20))

textbox.grid(row="0", column="0", columnspan="4")

def displayVal(row_index, column_index):

# get the textbox value

textbox_val = textbox.get()

# clear textbox

textbox.delete(0,END)

# get the clicked button value

btn_val = buttons[row_index][column_index]['text']

# new val

val = textbox_val + btn_val

# display the new val in textbox

textbox.insert(0,val)

# create a function to calculate

def calc(opr):

if opr != '=':

global calc_opr, number_1

calc_opr = opr

number_1 = float(textbox.get())

textbox.delete(0,END)

elif opr == '=':

number_2 = float(textbox.get())

if calc_opr == '+':

val = number_1 + number_2

elif calc_opr == '-':

val = number_1 - number_2

elif calc_opr == '/':

val = number_1 / number_2

elif calc_opr == '*':

val = number_1 * number_2

textbox.delete(0,END)

textbox.insert(0,val)

# create a function to clear textbox

def clear():

textbox.delete(0,END)

# display buttons

for i in range(4):

btn_row = []

for j in range(4):

key = "{i}-{j}".format(i=i,j=j)

button = tk.Button(root, padx=15, pady=15, text = btns_vals[key],

font=("Arial",20))

if btns_vals[key] not in ('=','+','-','*','/'):

button['bg'] = 'Black'

button['fg'] = 'White'

button['command'] = lambda theRow = i,

theCol = j : displayVal(theRow, theCol)

else:

button['bg'] = 'Orange'

button['fg'] = 'White'

button['command'] = lambda operation = btns_vals[key] : calc(operation)

button.grid(row=i+1, column=j, sticky="nsew")

btn_row.append(button)

buttons.append(btn_row)

button = tk.Button(root, padx=15, pady=15,bg="grey", text = 'c', font=("Arial",20))

button['command'] = clear

button.grid(row=5,column=0,columnspan=4, sticky="nsew")

root.mainloop()

                                        

////// OUTPUT : 

if you want the source code file, click on the download button below

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