Enforcing Concrete Implementations

Medium Abstraction & Interfaces

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Problem Statement

Create an abstract class `Vehicle` with an abstract method `wheels()`. Create a subclass `Car` that implements `wheels()` to return 4. Create a subclass `Bike` that implements `wheels()` to return 2. Instantiate both and print their wheel counts.

Input Format

None

Output Format

Print the wheel counts on separate lines.

Constraints

None

Sample Output

4
2

Explanation

Abstract classes enforce a strict contract: any subclass must implement the abstract methods before it can be instantiated.

Starter Code

import abc

class Vehicle(abc.ABC):
    # Define abstract method wheels
    pass

class Car(Vehicle):
    # Implement wheels
    pass

class Bike(Vehicle):
    # Implement wheels
    pass

if __name__ == '__main__':
    # Instantiate both and print wheels()
    pass

Limits

Time Limit: 1s
Memory Limit: 256MB

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