__author__ = ‘chengang882‘import datetime# Store the next available id for all new notelast_id = 0class Note(object):    """Represent a note in the notebook. Match against a    string in searches and store tags for each note."""    def __init__(self, memo, tags=‘‘):        """initialize a note with memo and optional        space-separated tags. Automatically set the note‘s        creation date and a unique id."""        self.memo = memo        self.tags = tags        self.creation_date = datetime.date.today()        global last_id        last_id += 1        self.id = last_id    def match(self, filter):        """Determine if this note matches the filter        text. Return True if it matches, False otherwise.        Search is case sensitive and matches both text and        tags."""        return filter in self.memo or filter in self.tagsclass Notebook(object):    def __init__(self):        self.notes = []    def new_note(self, memo, tags=‘‘):        self.notes.append(Note(memo, tags))    def _find_note(self, note_id):        for note in self.notes:            if str(note.id) == str(note_id):                return note        return None    def modify_memo(self, note_id, memo):        note = self._find_note(note_id)        if note:            note.memo = memo            return True        return False    def modify_tags(self, note_id, tags):        self._find_note(note_id).tags = tags    def search(self, filter):        return [note for note in self.notes if                note.match(filter)]

__author__ = ‘chengang882‘import sysfrom notebook import Notebook, Noteclass Menu:    def __init__(self):        self.notebook = Notebook()        self.choices = {            "1": self.show_notes,            "2": self.search_notes,            "3": self.add_note,            "4": self.modify_note,            "5": self.quit        }    def display_menu(self):        print("""        Notebook Menu        1. Show all Notes        2. Search Notes        3. Add Note        4. Modify Note        5. Quit        """)    def run(self):        while True:            self.display_menu()            choice = raw_input("Enter an option: ")            action = self.choices.get(str(choice))            if action:                action()            else:                print("{0} is note a valid choice".format(choice))    def show_notes(self, notes=None):        if not notes:            notes = self.notebook.notes        for note in notes:            print("{0}: {1}\n{2}".format(                note.id, note.tags, note.memo))    def search_notes(self):        filter = raw_input("Search for: ")        notes = self.notebook.search(filter)        self.show_notes(notes)    def add_note(self):        memo = raw_input("Enter a memo: ")        print(memo)        self.notebook.new_note(memo)        print("Your note has been added.")    def modify_note(self):        id = raw_input("Enter a note id: ")        memo = raw_input("Enter a memo: ")        tags = raw_input("Enter tags: ")        if memo:            self.notebook.modify_memo(id, memo)        if tags:            self.notebook.modify_tags(id, tags)    def quit(self):        print("Thank you for using your notebook today.")        sys.exit(0)if __name__ == "__main__":    Menu().run()