2.14 adding comments

# this exercise will look at adding commands to the programme
# using the hash key allows the computer to recognise the text as COMMENTS only
# and not to be used in the execution of the programme.
# each new line of comment must be fronted with a # key.
# in Mu it is shown as greyed out text.  In Trinket I think it is green text.
# the first line of code introduces the bot, Marvin.
# the second line asks for the user's name.
# The programme creates a VARIABLE with the answer.
print("Hello there.  My name is Marvin and I'm your personal bot.")
user_name=input("What's your name?")
# the third line of code (line 8) instructs the computer to print a welcome message and include the variable called user_name
print("Hello " + user_name + " and welcome.")
#the fourth line of code is asking the user to give the computer an instruction that it can only respond to if it has an appropriate command
command = input("How can I help? >")
# and from now on the computer is responding to if elif else commands
if command == "add" or command == "plus":
    print("Let's add some numbers.")
    input1=input("Number1 > ")
    input2=input("Number2 > ")
    number1=int(input1)
    number2=int(input2)
    result=number1+number2
    output=str(result)
    print(input1 + "+" + input2 + "=" + output)
elif command == "subtract" or command == "take away":
        print("Let's subtract some numbers.")
        input1=input("Number1")
        input2=input("Number2")
        number1=int(input1)
        number2=int(input2)
        result=number1-number2
        output=str(result)
        print(input1 + "-" + input2 + "=" + output)
# the next line of code instructs the bot to tell the user that it doesn't
# recognise either of the input answers and to let the user know this then
# close the conversation
else:
        print("Sorry I don't understand.  Bye.")
# and the last line is a sign off from the bot
print ("If that's all, I'll say goodnight.")