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" or command == "plus":
        result = number1 + number2
        operator = " + "
    elif command == "subtract" or command == "minus":
        result = number1 - number2
        operator = " - "
    elif command == "multiply" or command == "times":
        result = number1 * number2
        operator = " * "
    elif command == "divide" or command == "division":
        result = number1 / number2
        operator = " / "
    output = str(result)
    print(input1 + operator + input2 + " = " + output)

def Add_Them_Up():
     total = 0
     how_many = input("how many numbers would you like to enter? ")
     how_many = int(how_many)
     for item_number in range(how_many):
         number = input("Enter the number of " + str(item_number) + "> ")
         total = total + int(number)
     if command == "total":
         print("You have entered " + str(how_many) + " numbers. Your total is " + str(total))
     elif command == "average" or command == "avg":
         avg = total / int(how_many)
         print("You have entered " + str(how_many) + " numbers. Your average is " + str(avg))

finished = False
while finished == False:
    print("Hi, I am Zed, your personal bot.")
    command = input("How can I help (bye to end program)? ")
    if command == "add" or command == "plus":
        do_calculation()
    elif command == "subtract" or command == "minus":
        do_calculation()
    elif command == "multiply" or command == "times":
        do_calculation()
    elif command == "divide" or command == "division":
        do_calculation()
    elif command == "Area":
        print("lets calculate the area of a triangle")
        input1 = input("Base > ")
        input2 = input("Hypotenuse > ")
        number1 = int(input1)
        number2 = int(input2)
        result = (number1 * number2) / 2
        output = str(result)
        print("(Base:"+input1 + " * " + "Hypotenuse:"+input2 + ") / 2" + " = " + output)
    elif command == "average" or command == "avg":
        total = 0
        how_many = input("how many numbers? ")
        how_many = int(how_many)
        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" or command == "shop":
        total = 0
        shopping = []
        how_many = input("how many items of shopping do you have? ")
        how_many = int(how_many)
        for item_number in range(how_many):
            item = input("what is the item " + str(item_number) + " ? ")
            number = input("Enter the cost of " + str(item) + "> ")
            total = total + int(number)
            shopping.append(item)
        print(shopping)
        print("You have " + str(how_many) + " items in your shopping list. Your total is " + str(total))
    elif command == "total":
        Add_Them_Up()
    elif command == "average" or "avg":
        Add_Them_Up()
    elif command == "bye":
        finished = True
    else:
        print("sorry I dont understand")