def do_calculation():
    input1 = input("Input number 1 ")
    input2 = input("Input number 2 ")
    number1 = int(input1)
    number2 = int(input2)
    if command == "+":
        result = number1 + number2
        print ("Result is " + str(result))

    elif command == "-":
        result = number1 - number2
        print ("Result is " + str(result))
    elif command == "x":
        result = number1 * number2
        print ("Result is " + str(result))
    elif command == "/":
        result = number1 / number2
        operator = "/ "
        output = str(result)
        print(input1 + operator + input2 + " = " + output)
def do_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)
    output = total/how_many
    print("The average = " + str(output))

finished = False
while finished == False:
    print ("Hi, I am Doris your personal Bot.")
    command = input("What would you like to do - add (+), subtract (-), multiply (x), divide (/)or average (aver)? ")
    if command == "add" or command == "+":
        do_calculation()
    elif command == "subtract" or command == "-":
        do_calculation()
    elif command == "multiply" or command == "x":
        do_calculation()
    elif command == "divide" or command == "/":
        do_calculation()
    elif command == "average" or command == "aver":
        do_average()
    elif command == "bye":
        finished = True
        print ("Goodbye")

    else:
        print("Sorry I don't understand")