#define a function
def do_calculation():
    print("lets " + command + " some numbers")
    input1 = input("Number 1 = ")
    input2 = input("Number 2 = ")
    number1 = int(input1)
    number2 = int(input2)
    #user asks bot to add
    if command == "add" or command == "plus" or command == "+":
        result = number1 + number2
        operator = " + "
    #user asks bot to subtract
    elif command == "subtract" or command == "take away" or command == "takeaway" or command == "minus":
        result = number1 - number2
        operator = " - "
    #user asks bot to multiply
    elif command == "multiply" or command == "times":
        result = number1 * number2
        operator = " * "
    #user asks bot to divide
    elif command == "divide":
        result = number1 / number2
        operator = " / "
    output = str(result)
    print(input1 + operator + input2 + " = " +output)


    #conditional loop
print("Hi, I'm Marvin, your personal bot")
print("We are going to have some fun together.")
guess = input("Firstly, I would like you to guess the band that I am thinking of... ")
count = 1
while guess != "andsoiwatchyoufromafar":
    guess = input("wrong - guess again ")
    count = count +1
print("well done!")
count = str(count)
print("It took you " + count + " attempts to get the correct answer.")

finished = False
while finished == False:
    print("Now we can do some calcuations. What would you like to do?")
    command = input("Add? Subtract? Multiply? Divide? Find an average? Total a set of numbers? Write your shopping list? Find out how much you owe at the restaurant?")
        #user specifies what they would like bot to do.
    if command == "add" or command == "plus" or command == "+":
        do_calculation()
    elif command == "subtract" or command == "take away" or command == "takeaway" or command == "minus":
        do_calculation()
    elif command == "multiply" or command == "times":
        do_calculation()
    elif command == "divide":
        do_calculation()

#user asks to calculate an average
    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+1) + ": ")
            total = total + int(number)
        result = total / how_many
        print("The average of these numbers is " + str(result))
    elif command == "shopping":
        shopping = []
        how_many = input ("How many items of shopping do you need to get? ")
        how_many = int(how_many)
        for item_number in range(how_many):
            item = input("what is item number " +str(item_number+1) +"? ")
            shopping.append(item)
        print(shopping)
        for item in shopping:
            print(item)
        output =str(len(shopping))
        print("There are " + output + " items in your shopping list")
    elif command == "restaurant":
        how_many = input("How many diners? ")
        how_many = int(how_many)
        total = input ("How much is the total bill? £")
        total = int(total)
        result = total / how_many
        result = int(result)
        print("You each owe £" + str(result))
    elif command == "total":
        total = 0
        how_many = input("How many numbers do you have? ")
        how_many = int(how_many)
        for number in range(how_many):
            number = input("What is the number? ")
            number = int(number)
            total = total + number
        print("Your total is " + str(total))
        total = int(total)
        print("The mean average is " + str(total/how_many))
    elif command == "bye":
        finished=True
        print("It was great to talk to you. Thanks. See you again soon. Bye!")
    else:
        print(" Sorry I don't understand")
        print("If I can't help you any more then please be polite and say bye.")