def Command_Open():
    return

def Command_Save():
    return

def Command_Print():
    return

def Command_New():
    return

# The problem with previous versions of the command processor
# is that command "OPEN" is legal but command "open" is not.
# By using the .upper() method on strings, we can capitalize the
# user's input, and test against only the upper case version.
# The user could enter "open", "OPEN", "Open", "oPeN", or any
# other variant, and it will always be treated as "OPEN".

def Main():
    MoreToDo = True
    while MoreToDo:
        Command = input("Enter a command --- ")
        Command = Command.upper()                    # Capitalize string
        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