reuse

def do_calculation():
    print("lets " + command + " some numbers")
    input1 = input("Number 1>")
    input2 = input("Number 2>")
    number1 = int(input1)
    number2 = int(input2)
    if command == "add":
        result = number1 + number2
    elif command == "subtract":
        result = number1 - number2
    output = str(result)
    if command == "add":
        print(input1 + " + " + input2 + " = " + output)
    elif command == "subtract":
        print(input1 + " + " + input2 + " = " + output)

finished = False
while finished == False:
    print("Him I am Mr Biddle, your personal bot. ")
    command = input("How can I help?")
    if command =="add":
        do_calculation()
    if command =="subtract":
        do_calculation()
    elif command == "multiply":
        print("Lets multiply some numbers")
        input1 = input("Number 1> ")
        input2 = input("Number 2> ")
        number1 = int(input1)
        number2 = int(input2)
        result = number1 * number2
        output = str(result)
        print(input1 + " * " + input2 + " = " + output)
    elif command == "area":
        print("lets find out the area of this room")
        input1 = input("length> ")
        input2 = input("width> ")
        number1 = int(input1)
        number2 = int(input2)
        result = number1 * number2
        output = str(result)
        print(input1 + " * " + input2 + " = " + output)
    elif command == "average":
        how_many = input("how many numbers> ")
        how_many = int(how_many)
        total = 0
        for number_count in range(how_many):
            number = input("Enter number " + str(number_count) + ">")
            total = total + int(number)
        result = total / how_many
        print("the average = " + str(result))
    elif command=="shopping":
        shopping=[]
        how_many=input("How many items do you have in your shopping list")
        how_many=int(how_many)
        for item_number in range(how_many):
            item=input("what is item number " + str(item_number) + "?")
            shopping.append(item)
        for item in shopping:
            print(item)
        total=len(shopping)
        print("you have "+str(total)+" items in your shopping list")
    elif command == "bye":
        finished = True
    else:
        print("sorry I dont have a scooby")