Note-Taking Application in Python

Create a file named note_taking_app.py and add the following code:

pythonCopy codeimport json
import os

class NoteTakingApp:
    def __init__(self, filename='notes.json'):
        self.filename = filename
        self.notes = self.load_notes()

    def load_notes(self):
        """Load notes from a JSON file."""
        if os.path.exists(self.filename):
            with open(self.filename, 'r') as file:
                return json.load(file)
        return []

    def save_notes(self):
        """Save notes to a JSON file."""
        with open(self.filename, 'w') as file:
            json.dump(self.notes, file)

    def add_note(self, note):
        """Add a new note."""
        self.notes.append(note)
        self.save_notes()
        print("Note added!")

    def view_notes(self):
        """View all notes."""
        if not self.notes:
            print("No notes available.")
            return
        print("\nYour Notes:")
        for index, note in enumerate(self.notes, start=1):
            print(f"{index}. {note}")
        print()

    def delete_note(self, index):
        """Delete a note by index."""
        if 0 <= index < len(self.notes):
            deleted_note = self.notes.pop(index)
            self.save_notes()
            print(f"Deleted note: {deleted_note}")
        else:
            print("Invalid note index.")

    def run(self):
        """Run the note-taking application."""
        while True:
            print("Note-Taking Application")
            print("1. Add Note")
            print("2. View Notes")
            print("3. Delete Note")
            print("4. Exit")
            choice = input("Choose an option (1-4): ")

            if choice == '1':
                note = input("Enter your note: ")
                self.add_note(note)
            elif choice == '2':
                self.view_notes()
            elif choice == '3':
                self.view_notes()
                index = int(input("Enter the note number to delete: ")) - 1
                self.delete_note(index)
            elif choice == '4':
                print("Exiting the application.")
                break
            else:
                print("Invalid choice. Please try again.")

def main():
    app = NoteTakingApp()
    app.run()

if __name__ == "__main__":
    main()

Step 2: Running the Note-Taking Application

1. Open your terminal (or command prompt).
2. Navigate to the directory where you saved note_taking_app.py.
3. Run the script using the command:bashCopy codepython note_taking_app.py

How It Works

• Data Storage: Notes are stored in a JSON file (notes.json). This allows for persistent storage of notes between sessions.
• Functions:
  • load_notes: Loads existing notes from the JSON file.
  • save_notes: Saves the current notes back to the JSON file.
  • add_note: Adds a new note to the list.
  • view_notes: Displays all stored notes.
  • delete_note: Deletes a note by its index.
• User Interface: The command-line interface allows users to choose actions like adding, viewing, or deleting notes.