Mixing Concrete and Abstract Methods

Medium Abstraction & Interfaces

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Problem Statement

Create an abstract class `Appliance`. Define an abstract method `turn_on()`. Define a concrete method `plug_in()` that prints ‘Plugged into wall’. Subclass `Toaster` implementing `turn_on()` to print ‘Heating’. Call both methods on a `Toaster` instance.

Input Format

None

Output Format

Print the messages sequentially.

Constraints

None

Sample Output

Plugged into wall
Heating

Explanation

Abstract Base Classes can provide shared utility logic (concrete methods) alongside strict contracts (abstract methods).

Starter Code

import abc

class Appliance(abc.ABC):
    # Define abstract turn_on and concrete plug_in
    pass

class Toaster(Appliance):
    # Implement turn_on
    pass

if __name__ == '__main__':
    t = Toaster()
    t.plug_in()
    t.turn_on()

Limits

Time Limit: 1s
Memory Limit: 256MB

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