Build a library due date reminder

Here’s a simple implementation of a Library Due Date Reminder system in Python. This system allows users to add borrowed books with due dates and receive reminders for upcoming or overdue returns.

python
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import datetime

class LibraryReminder:
    def __init__(self):
        self.borrowed_books = []

    def add_book(self, title, due_date_str):
        due_date = datetime.datetime.strptime(due_date_str, "%Y-%m-%d").date()
        self.borrowed_books.append({"title": title, "due_date": due_date})
        print(f"Book '{title}' added with due date {due_date}.")

    def list_books(self):
        if not self.borrowed_books:
            print("No books borrowed.")
            return
        print("Borrowed Books:")
        for book in self.borrowed_books:
            status = self._get_status(book["due_date"])
            print(f"- {book['title']} (Due: {book['due_date']}) - {status}")

    def check_reminders(self):
        today = datetime.date.today()
        reminders = []
        for book in self.borrowed_books:
            days_left = (book["due_date"] - today).days
            if days_left < 0:
                reminders.append(f"OVERDUE: '{book['title']}' was due on {book['due_date']}.")
            elif days_left <= 3:
                reminders.append(f"REMINDER: '{book['title']}' is due in {days_left} day(s) on {book['due_date']}.")
        return reminders

    def _get_status(self, due_date):
        today = datetime.date.today()
        if due_date < today:
            return "Overdue"
        elif (due_date - today).days <= 3:
            return "Due Soon"
        else:
            return "On Time"

# Example usage:
if __name__ == "__main__":
    reminder = LibraryReminder()
    reminder.add_book("1984", "2025-05-20")
    reminder.add_book("To Kill a Mockingbird", "2025-05-17")
    reminder.list_books()
    print("n--- Reminders ---")
    for r in reminder.check_reminders():
        print(r)

Features:

• Add books with due dates.

• List all borrowed books with status (On Time, Due Soon, or Overdue).

• Check reminders for books due in 3 days or less or already overdue.

Customization ideas:

• Store data persistently (e.g., JSON or SQLite).

• Send email or SMS reminders using a scheduler like cron or Python’s schedule.

• Add a user interface (e.g., with Tkinter or a web app framework like Flask). Let me know if you’d like that version next.