We learn better while we practice. Thus I created a simple calculator with the help of python and its Libraries.
I used spyder IDE and tkinter (kinter) library for creating calcultor.
Code is below:-
import warnings
warnings.simplefilter(“ignore”)
from tkinter import *
root = Tk()
root.title(“Simple Calculator”)
e = Entry(root, width =40, borderwidth = 5)
e.grid(row =0, column = 0, columnspan = 3, padx = 10, pady = 10)
def button_click(number):
current = e.get()
e.delete(0,END)
e.insert(0,str(current)+ str(number))
return
def button_clear():
e.delete(0,END)
def button_add():
first_number = e.get()
global f_num
global math
math = “addition”
f_num = int(first_number)
e.delete(0,END)
def button_equal():
second_number = e.get()
e.delete(0,END)
if math == “addition”:
e.insert(0, f_num + int(second_number))
if math == “Substraction”:
e.insert(0, f_num — int(second_number))
if math == “Multiplication”:
e.insert(0, f_num * int(second_number))
if math == “Division”:
e.insert(0, f_num / int(second_number))
def button_sub():
first_number = e.get()
global f_num
global math
math = “Substraction”
f_num = int(first_number)
e.delete(0,END)
def button_Mul():
first_number = e.get()
global f_num
global math
math = “Multiplication”
f_num = int(first_number)
e.delete(0,END)
def button_Div():
first_number = e.get()
global f_num
global math
math = “Division”
f_num = int(first_number)
e.delete(0,END)
# Defining Buttons
button_1 = Button(root, text = “1”, padx = 30, pady = 18, command =lambda: button_click(1))
button_2 = Button(root, text = “2”, padx = 30, pady = 18, command = lambda: button_click(2))
button_3 = Button(root, text = “3”, padx = 30, pady = 18, command = lambda: button_click(3))
button_4 = Button(root, text = “4”, padx = 30, pady = 18, command = lambda: button_click(4))
button_5 = Button(root, text = “5”, padx = 30, pady = 18, command = lambda: button_click(5))
button_6 = Button(root, text = “6”, padx = 30, pady = 18, command = lambda: button_click(6))
button_7 = Button(root, text = “7”, padx = 30, pady = 18, command = lambda: button_click(7))
button_8 = Button(root, text = “8”, padx = 30, pady = 18, command = lambda: button_click(8))
button_9 = Button(root, text = “9”, padx = 30, pady = 18, command = lambda: button_click(9))
button_10 = Button(root, text = “0”, padx = 30, pady = 18, command = lambda: button_click(0))
button_add = Button(root, text = “+”, padx = 35, pady = 18, command = button_add)
button_equal = Button(root, text = “=”, padx = 35, pady = 18, command = button_equal)
button_clear = Button(root, text = “Clear”, padx = 35, pady = 18, command = button_clear)
button_sub = Button(root, text = “-”, padx = 35, pady = 18, command = button_sub)
button_Mul = Button(root, text = “*”, padx = 35, pady = 18, command = button_Mul)
button_Div = Button(root, text = “/”, padx = 35, pady = 18, command = button_Div)
# Put button on Screen
button_1.grid(row =3 , column =0 )
button_2.grid(row =3 , column = 1)
button_3.grid(row = 3, column = 2)
button_4.grid(row = 2, column = 0)
button_5.grid(row = 2, column = 1)
button_6.grid(row = 2, column = 2)
button_7.grid(row = 1, column = 0)
button_8.grid(row = 1, column = 1)
button_9.grid(row = 1, column = 2)
button_10.grid(row = 4, column = 0 )
button_add.grid(row =3 , column =3 )
button_sub.grid(row =2 , column =3 )
button_Mul.grid(row =1 , column =3 )
button_Div.grid(row =4 , column =3)
button_equal.grid(row =4 , column = 2) #columnspan = 2)
button_clear.grid(row = 4, column = 1) #columnspan = 2)
root.mainloop()
Explaination of code:
Importing the libraries
from tkinter import *
we are importing the tkinter library
root = Tk()
root.title(“Simple Calculator”)
e = Entry(root, width =40, borderwidth = 5)
e.grid(row =0, column = 0, columnspan = 3, padx = 10, pady = 10)
we are creating an object root which has function of tkinter. e is the object for the screen, it will use Entry method with root, width & boderwidth of screen.
Then we create functions like button_click, button_clear, button_add, button_equal, button_sub, button_mul, button_div, with it functions.
Then we define the buttons with their features, we create grids for the different buttons and assign their space on the calculator.
