Vehicle Rental Service
Part of the Object Oriented Programming section of Coddy's Python journey — lesson 64 of 64.
Challenge
MediumIn this challenge, you'll implement a vehicle rental system. The system models vehicles, rentals, and a rental agency with proper inheritance and encapsulation.
vehicle.py- Implement the base Vehicle classcar.py- Implement the Car subclassmotorcycle.py- Implement the Motorcycle subclassrental.py- Implement the Rental classrentalagency.py- Implement the RentalAgency class
Each file contains detailed TODO comments guiding your implementation. Follow these comments to ensure your code meets all requirements.
Cheat sheet
This challenge focuses on implementing a vehicle rental system using object-oriented programming principles including inheritance and encapsulation. The system consists of multiple classes working together to model a complete rental business.
The implementation involves creating:
- A base
Vehicleclass with common properties and methods CarandMotorcyclesubclasses that inherit from Vehicle- A
Rentalclass to manage individual rental transactions - A
RentalAgencyclass to coordinate the entire rental system
Try it yourself
from vehicle import Vehicle
from car import Car
from motorcycle import Motorcycle
from rental import Rental
from rentalagency import RentalAgency
# Comprehensive test case handler
test_case = input()
if test_case == "create_vehicles":
# Test vehicle creation
car = Car("C123", "Toyota", "Camry", 50, 5)
bike = Motorcycle("M456", "Honda", "CBR", 35, 600)
print(car)
print(bike)
elif test_case == "rental_workflow":
# Test rental workflow
agency = RentalAgency("Quick Rentals")
# Add vehicles
car = Car("C123", "Toyota", "Camry", 50, 5)
bike = Motorcycle("M456", "Honda", "CBR", 35, 600)
agency.add_vehicle(car)
agency.add_vehicle(bike)
# Check available vehicles
print(f"Available before rental: {len(agency.available_vehicles())}")
# Rent a vehicle
rental_id = agency.rent_vehicle("C123", "John Doe", 3)
print(f"Rental created: {rental_id}")
# Check available vehicles after rental
print(f"Available after rental: {len(agency.available_vehicles())}")
# Return vehicle
agency.return_vehicle(rental_id)
# Check available vehicles after return
print(f"Available after return: {len(agency.available_vehicles())}")
elif test_case == "rental_cost":
# Test rental cost calculation
car = Car("C123", "Toyota", "Camry", 50, 5)
rental = Rental("R1", car, "John Doe", 3)
print(f"Rental cost for 3 days: ${rental.calculate_cost()}")
elif test_case == "vehicle_methods":
# Test Vehicle methods
vehicle = Vehicle("V789", "Generic", "Vehicle", 25)
print(vehicle)
print(f"Start rental: {vehicle.start_rental()}")
print(f"Start rental again: {vehicle.start_rental()}")
print(f"End rental: {vehicle.end_rental()}")
print(f"Start rental after end: {vehicle.start_rental()}")
elif test_case == "inheritance_check":
# Test inheritance relationships
car = Car("C123", "Toyota", "Camry", 50, 5)
bike = Motorcycle("M456", "Honda", "CBR", 35, 600)
print(f"Car is a Vehicle: {isinstance(car, Vehicle)}")
print(f"Motorcycle is a Vehicle: {isinstance(bike, Vehicle)}")
print(f"Car is a Motorcycle: {isinstance(car, Motorcycle)}")
elif test_case == "polymorphism":
# Test polymorphic behavior
vehicles = [
Vehicle("V789", "Generic", "Vehicle", 25),
Car("C123", "Toyota", "Camry", 50, 5),
Motorcycle("M456", "Honda", "CBR", 35, 600)
]
for i, v in enumerate(vehicles):
print(f"Vehicle {i+1}: {v}")
elif test_case == "rental_edge_cases":
# Test rental edge cases
agency = RentalAgency("Edge Rentals")
# Try to rent non-existent vehicle
print(f"Rent non-existent: {agency.rent_vehicle('X999', 'John Doe', 3)}")
# Add a car and rent it
car = Car("C123", "Toyota", "Camry", 50, 5)
agency.add_vehicle(car)
rental_id = agency.rent_vehicle("C123", "John Doe", 3)
print(f"Valid rental: {rental_id}")
# Try to rent the same car again
print(f"Rent unavailable car: {agency.rent_vehicle('C123', 'Jane Smith', 2)}")
# Try to return non-existent rental
print(f"Return non-existent rental: {agency.return_vehicle('R999')}")
# Return the valid rental
print(f"Return valid rental: {agency.return_vehicle(rental_id)}")
# Try to return the same rental again
print(f"Return completed rental: {agency.return_vehicle(rental_id)}")
elif test_case == "agency_operations":
# Test comprehensive agency operations
agency = RentalAgency("Full Service Rentals")
# Add 5 vehicles
vehicles = [
Car("C1", "Toyota", "Camry", 50, 5),
Car("C2", "Honda", "Accord", 55, 5),
Car("C3", "Ford", "Focus", 45, 5),
Motorcycle("M1", "Honda", "CBR", 35, 600),
Motorcycle("M2", "Yamaha", "R1", 40, 1000)
]
for v in vehicles:
agency.add_vehicle(v)
print(f"Available vehicles: {len(agency.available_vehicles())}")
# Rent 3 vehicles
rental_ids = [
agency.rent_vehicle("C1", "Customer 1", 3),
agency.rent_vehicle("C2", "Customer 2", 5),
agency.rent_vehicle("M1", "Customer 3", 2)
]
print(f"Available after rentals: {len(agency.available_vehicles())}")
# Return 2 vehicles
agency.return_vehicle(rental_ids[0])
agency.return_vehicle(rental_ids[1])
print(f"Available after returns: {len(agency.available_vehicles())}")
# Print available vehicles
print("Available vehicles:")
for v in agency.available_vehicles():
print(f" {v}")
elif test_case == "stress_test":
# Stress test with many vehicles
agency = RentalAgency("Stress Test Rentals")
# Add 100 vehicles
for i in range(100):
if i % 2 == 0:
vehicle = Car(f"C{i}", "Make{i}", f"Model{i}", 50, 5)
else:
vehicle = Motorcycle(f"M{i}", "Make{i}", f"Model{i}", 35, 600)
agency.add_vehicle(vehicle)
# Rent 50 vehicles
rental_ids = []
for i in range(50):
vin = f"C{i*2}" if i % 2 == 0 else f"M{i*2-1}"
rental_id = agency.rent_vehicle(vin, f"Customer{i}", 3)
rental_ids.append(rental_id)
print(f"Available after 50 rentals: {len(agency.available_vehicles())}")
# Return all rentals
for rental_id in rental_ids:
agency.return_vehicle(rental_id)
print(f"Available after all returns: {len(agency.available_vehicles())}")
elif test_case == "invalid_inputs":
# Test with invalid inputs
car = Car("C123", "Toyota", "Camry", -50, 5)
print(f"Car with negative rate: {car}")
bike = Motorcycle("M456", "Honda", "CBR", 35, 0)
print(f"Motorcycle with zero engine: {bike}")
rental_zero = Rental("R1", car, "John Doe", 0)
print(f"Rental with zero days cost: ${rental_zero.calculate_cost()}")
rental_neg = Rental("R2", car, "Jane Smith", -3)
print(f"Rental with negative days cost: ${rental_neg.calculate_cost()}")All lessons in Object Oriented Programming
1Fundamentals of OOP
External FilesIntroduction to OOPClasses vs ObjectsThe self ParameterMethodsAttributesConstructor Method (__init__)Recap - Simple Calculator4Inheritance
Basic InheritanceThe super() FunctionMethod OverridingMultiple InheritanceMethod Resolution OrderRecap - Employee Hierarchy7Special Methods
Magic Methods IntroductionOperator OverloadingContainer Magic MethodsRecap - Custom List10Design Patterns Part 1
Intro to design patternSingleton PatternFactory PatternObserver PatternStrategy Pattern2Decorators
Introduction to DecoratorsProperty DecoratorStatic Method DecoratorClass Method Decorator5Polymorphism
Method Overriding RevisitedDuck TypingAbstract Classes and MethodsInterface DesignRecap - Shape Calculator8Advanced OOP Concepts
Composition vs InheritanceMixinsStatic and Class MethodsClass DecoratorsContext Managers3Class Properties
Instance vs Class VariablesProperty DecoratorsPrivate AttributesRecap - Bank Account Manager6Encapsulation
Public, Protected, Private MemAccess ModifiersInformation HidingProperty Decorators AdvancedRecap - Student Records System12Project: Library Management
Project OverviewBook and User Classes