learning-by-doing/python_3_oop/chapter02/menu.py

import sys
import pickle
from notebook import Notebook, Note


class Menu:
    '''Display a menu and respond to choices when run.'''

    def __init__(self):
        self.picklefile = 'notebook.pickle'
        self.notebook = Notebook()
        self.choices = {
            "1": self.show_notes,
            "2": self.search_notes,
            "3": self.add_note,
            "4": self.modify_note,
            "5": self.load_notes,
            "6": self.save_notes,
            "7": self.quit
        }

    def display_menu(self):
        print("""
Notebook Menu
1. Show all Notes
2. Search Notes
3. Add Note
4. Modify Note
5. Load Notes
6. Save Notes
7. Quit """)

    def run(self):
        '''Display the menu and respond to choices.'''
        while True:
            self.display_menu()
            choice = input("Enter an option: ")
            action = self.choices.get(choice)
            if action:
                action()
            else:
                print("{0} is not 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 = input("Search for: ")
        notes = self.notebook.search(filter)
        self.show_notes(notes)

    def add_note(self):
        memo = input("Enter a memo: ")
        self.notebook.new_note(memo)
        print("Your note has been added.")

    def modify_note(self):
        id = input("Enter a note id: ")
        memo = input("Enter a memo: ")
        tags = input("Enter tags: ")
        if memo:
            if not self.notebook.modify_memo(id, memo):
                print("Note with id {0} doesn't exist.".format(id))
        if tags:
            if not self.notebook.modify_tags(id, tags):
                print("Note with id {0} doesn't exist.".format(id))

    def load_notes(self):
        with open(self.picklefile, 'rb') as f:
            # The protocol version used is detected automatically, so we do not
            # have to specify it.
            self.notebook = pickle.load(f)

    def save_notes(self):
        with open(self.picklefile, 'wb') as f:
            # Pickle the 'data' dictionary using the highest protocol available.
            pickle.dump(self.notebook, f, pickle.HIGHEST_PROTOCOL)

    def quit(self):
        print("Thank you for using your notebook today.")
        sys.exit(0)


if __name__ == "__main__":
    Menu().run()