calculator.py

#this function will do the calculations
def calculator() :
    while True :

        #checks to see if there are any value errors
        try :
            x = int(input('Please enter first number : ')).strip()

            #the while loop validates if the operator is correct
            while True :
                operator = input('please choose a operator (*, /, -, +) : ').strip()
                if operator not in ['*','/','-','+'] :
                    print('please enter a valid operator')
                    continue #restarts the loop if a correct operator is not entered
                
                break #stops the while loop if the operator is correct

            y = int(input('Please enter second number : ')).strip()

            calc = 0

            #does the calculations based of the operator
            if operator == '/' :
                calc = calc + (x / y)
            elif operator == '+' :
                calc = calc + (x + y)
            elif operator == '-' :
                calc = calc + (x - y)
            elif operator == '*' :
                calc = calc + (x * y)
            
            #this while loop validates if the user picks yes or no 
            #if not then privides an error message
            while True :
                con = input('do you wanna continue (y/n)? ').strip().lower()
                if con not in ['y','n'] :
                    print('please pick the correct input')
                    continue

                break

            #the if statement chekc if the user wants to continue or not
            #if they don't then if returns the calculation
            if con == 'n' :
                return calc

            # the while loop will allow the user to continue calculating
            # as long as they say yes 
            while con != 'n' :
                 
                #the while loop validates if the operator is correct
                while True :
                    operator = input('please choose a operator (*, /, -, +) : ').strip()
                    if operator not in ['*','/','-','+'] :
                        print('please enter a valid operator')
                        continue #restarts the loop if a correct operator is not entered
                    
                    break #stops the while loop if the operator is correct

                num = input('please enter a number : ').strip()

                #does the calculations based of the operator
                if operator == '/' :
                    calc = calc + num
                elif operator == '+' :
                    calc = calc + num
                elif operator == '-' :
                    calc = calc + num
                elif operator == '*' :
                    calc = calc + num

                #this while loop validates if the user picks yes or no 
                #if not then privides an error message
                while True :
                    con = input('do you wanna continue (y/n)? ').strip().lower()
                    if con not in ['y','n'] :
                        print('please pick the correct input')
                        continue #restarts the the loop if correct input is not entered  

                    break # stops the loop id the correct input is entered 
            
            return calc
        except ValueError :
            print('please enter the correct input')

print(calculator())