私はPythonOOPを初めて使用し、ライブラリを管理するためのOOPプログラムを作成しようとしています。このコードは本からのものです。
action()このコードは期待どおりに機能していますが、特定のオプションを選択したときに対応する関数がどのように呼び出されるかを理解する必要があります。たとえば、関数を選択すると1、show_notes関数を呼び出さなくても呼び出されます。
Menu.py
import sys
from notebook import Notebook, Note
class Menu:
'''Display a menu and respond to choices when run.'''
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):
'''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:
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()
notebook.py
import datetime
# Store the next available id for all new notes
last_id = 0
class Note:
'''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.tags
class Notebook:
'''Represent a collection of notes that can be tagged,
modified, and searched.'''
def __init__(self):
'''Initialize a notebook with an empty list.'''
self.notes = []
def new_note(self, memo, tags=''):
'''Create a new note and add it to the list.'''
self.notes.append(Note(memo, tags))
def _find_note(self, note_id):
'''Locate the note with the given id.'''
for note in self.notes:
if str(note.id) == str(note_id):
return note
return None
def modify_memo(self, note_id, memo):
'''Find the note with the given id and change its
memo to the given value.'''
note = self._find_note(note_id)
if note:
note.memo = memo
return True
return False
def modify_tags(self, note_id, tags):
'''Find the note with the given id and change its
tags to the given value.'''
note = self._find_note(note_id)
if note:
note.tags = tags
return True
return False
def search(self, filter):
'''Find all notes that match the given filter
string.'''
return [note for note in self.notes if
note.match(filter)]