def Command_Open():
    return

def Command_Save():
    return

def Command_Print():
    return

def Command_New():
    return

def MyInput (Message):          # Function to get a string and capitalize it
    S = input(Message)
    return S.upper()

# Python supports more different types of strings than
# just "double-quoted" or 'single-quoted' strings.  If
# you surround a string with """triple-double""" or
# '''triple-single''' quotes, the string is allowed to
# span line breaks, and the line breaks will be included
# in the string itself.  Notice that variable Message
# is assigned a four-line string, where the first three
# lines might contain instructions to the user, and the
# last contains the prompt indicating the place to type
# in a response.  This is passed to MyInput (and then
# on to input), so the entire four-line string is printed
# each time the user is requested for input.

def Main():
    Message = """Line #1 of instructions
Line #2 of instructions
Line #3 of instructions
Enter a command --- """

    MoreToDo = True
    while MoreToDo:
        Command = MyInput(Message)
        if   Command == "QUIT":  MoreToDo = False
        elif Command == "OPEN":  Command_Open()      # Call stub
        elif Command == "SAVE":  Command_Save()      # Call stub
        elif Command == "PRINT": Command_Print()     # Call stub
        elif Command == "NEW":   Command_New()       # Call stub
        elif Command == "EDIT":  pass                # Do nothing, replace with stub call later
        elif Command == "COPY":  pass                # Do nothing, replace with stub call later
        else:                    print ("Illegal Command")

    return