Flight Booking Project

Your task is to implement a flight booking system with the following capabilities:

• Create Flights with capacities and destinations.
• Register Passengers with unique identifiers.
• Allow Bookings linking passengers to flights.
• Manage the system via a BookingSystem class.
• Handle errors and edge cases, like full flights or duplicate bookings.

You will write code to pass the provided unittest tests, giving hands-on experience with Python OOP.

🧩 Classes and Responsibilities

1. Flight

• Represents a single flight.
• Key attributes: flight_number, origin, destination, capacity, booked_passengers.
• Key methods:
  • add_booking(passenger) → Adds a passenger; raises FlightFullError if full.
  • available_seats (property) → Returns seats left.
  • __eq__ → Compares flights by flight_number.
  • __str__ → Human-readable summary including flight number and seats left.
• Concepts learned: Encapsulation, dunder methods, exception handling, list management.

2. Passenger

• Represents a traveler.
• Key attributes: name, passport_number, bookings.
• Key methods:
  • add_booking(flight) → Adds a flight to passenger’s bookings.
  • cancel_booking(flight) → Removes a flight from bookings.
  • total_bookings (property) → Returns number of bookings.
  • __eq__ → Compares passengers by passport_number.
  • __repr__ → Debug-friendly string with name and passport.
• Concepts learned: Properties, dunder methods, composition.

3. Booking

• Connects a Passenger to a Flight.
• Key attributes: passenger, flight, status.
• Key methods:
  • confirm() → Links passenger and flight; sets status to Confirmed.
  • cancel() → Unlinks passenger and flight; sets status to Cancelled.
  • __str__ → Displays passenger, flight, and status.
• Concepts learned: Composition, state management, dunder methods.

4. BookingSystem

• Manages all flights, passengers, and bookings.
• Key methods:
  • add_flight(...) → Adds a flight.
  • register_passenger(...) → Registers a new passenger.
  • make_booking(flight_number, passport_number) → Creates and confirms a booking.
  • cancel_booking(flight_number, passport_number) → Cancels a booking.
  • get_passenger_manifest(flight_number) → Returns list of passengers on a flight.
  • Iteration and len() support over active bookings.
• Concepts learned: Aggregation, iteration, len(), system-level composition, exception handling.

5. exceptions.py

• Contains custom exceptions like FlightFullError.
• Helps students learn how to define and use custom exceptions.

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🧪 Tests

All functionality is verified via unit tests:

• test_flight.py → Tests flight creation, bookings, dunder methods, and capacity.
• test_passenger.py → Tests passenger creation, booking management, and equality.
• test_booking.py → Tests booking confirmation, cancellation, and linkage.
• test_booking_system.py → Tests system-level operations, iteration, len, and manifests.

Purpose: Students write code to pass these tests, learning TDD and OOP in action.

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📚 Python/OOP Concepts Covered

• Classes and Objects → Creating Flight, Passenger, Booking, BookingSystem.
• Composition/Aggregation → Linking passengers to flights via bookings.
• Dunder Methods → __eq__, __str__, __repr__.
• Properties → Passenger.total_bookings, Flight.available_seats.
• Exception Handling → Custom exceptions like FlightFullError.
• Iteration and len() → Over active bookings in BookingSystem.
• TDD Workflow → Implement code to pass tests.

To start

python -m unittest discover -s tests

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