print("Hello! Let's get to work.")
# users_name = input("Please enter your preferred name to begin")
# print("Welcome " + users_name)
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
        operator = " + "
    elif command == "subtract":
        result = number1 - number2
        operator = " - "
    elif command == "multiply":
        result = number1 * number2
        operator = " * "
    output = str(result)
    print(input1 + operator + input2 + " = " + output)

finished = False
while finished == False:

    command =input("How can I help? ")
    if command == "add":
        do_calculation()
    elif command == "subtract":
        do_calculation()
    elif command == "multiply":
        do_calculation()
    elif command == "divide":
        print("let's divide some numbers")
        input1 = input("Number 1> ")
        input2 = input("Number 2> ")
        if input2 == "0":
            print("Number 2 is invalid, as division by zero is undefined.")
            print("Please input a different value for Number 2")
            input2 = input("Number 2> ")
        number1 = int(input1)
        number2 = int(input2)
        result = number1 / number2
        output = str(result)
        print(input1 + " / " + input2 + " = " + output)
    elif command == "average":
        number_total = input("How many numbers do you want to average (please input a numeral)? ")
        number_total = int(number_total)
        average_list = []
        running_total = 0

        for current_number in range(number_total):
            input_number = input("Number " + str(current_number + 1) + " > ")
            average_list.append(input_number)
            running_total = running_total + int(input_number)
        output = running_total / len(average_list)

        str_total = " "
        for list_number in range(len(average_list)):
            new_str = str(average_list[list_number])
            if list_number == 0:
                str_total = str_total + new_str
            else: str_total = str_total + " + " + new_str
        print("The average of (" + str_total + " ) / " + str(len(average_list)) +  " = " + str(output))
    elif command == "median":
        item_total = input("How many numbers are there in your set? ")
        item_total = int(item_total)
        number_set = []
        number_set_order = []
        input_number = input("Number 1 > " )
        input_number = int(input_number)
        number_set.append(input_number)
        number_set_order.append(input_number)
        for current_number in range(item_total - 1):
            input_number = input("Number " + str(current_number + 2) + " > ")
            input_number = int(input_number)
            number_set_order.append(input_number)
            count_element = 0
            if input_number >= number_set[current_number]:
                number_set.append(input_number)
            else:
                while input_number > number_set[count_element]:
                    count_element = count_element + 1
                number_set.insert(count_element, input_number)

        if item_total % 2 == 0:
            output = (number_set[int(item_total / 2)] + number_set[int((item_total / 2) - 1)]) / 2
        else:
            output = number_set[int((item_total / 2) - 0.5)]

        print("The median value of the number set " + str(number_set_order) + " = " + str(output))

    elif command == "bye":
        finished = True
    else:
        print("I can't understand. Please only give commands to 'add', 'subtract', 'multiply', 'divide', 'average', or 'median'.")