How to Create a Calculator Using Python 2.7.x

#Author: ManishHacker1

Hello guys, I am back. Today we will create a simple Calculator using Python 2.7.x version. This calculator perform basic mathematical operation such as add, minus, multiply and divide two number entered by user.

Source Code

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from __future__ import division
import os
import time

# This function adds two numbers 
def add(x, y):
   return x + y

# This function subtracts two numbers 
def subtract(x, y):
   return x - y

# This function multiplies two numbers
def multiply(x, y):
   return x * y

# This function divides two numbers
def divide(x, y):
   return x / y
while True:
    print("Select operation.")
    print("1.Add")
    print("2.Subtract")
    print("3.Multiply")
    print("4.Divide")

# Take input from the user
    try:
        choice = int(raw_input("Enter choice(1/2/3/4):"))
    except:
        print "Invalid Value, Please Enter Right Option"
        time.sleep(5)
        os.system('cls')
    else:
        try:
            num1 = int(raw_input("Enter first number: "))
            num2 = int(raw_input("Enter second number: "))
        except:
            print "Invalid Value"
            time.sleep(5)
            os.system('cls')
        
        else:
            if choice == 1:
                print num1,'+',num2,'=', add(num1,num2)
                time.sleep(5)
                os.system('cls')
            elif choice == 2:
                print num1,"-",num2,"=", subtract(num1,num2)
                time.sleep(5)
                os.system('cls')
            elif choice == 3:
                print num1,"*",num2,"=", multiply(num1,num2)
                time.sleep(5)
                os.system('cls')
            elif choice == 4:
                try:
                    print num1,"/",num2,"=", divide(num1,num2)
                    time.sleep(5)
                    os.system('cls')
                except ArithmeticError:
                    print "Arithmetic Error, Please Enter Right Value"
                    time.sleep(3)
                    os.system('cls')
            else:
                 print "Invalid input"
                 time.sleep(5)
                 os.system('cls')

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