Force Subclasses to Implement pay()

Hard ⏱ 18 min 32% acceptance ★★★★☆ 4.2

Using abc.ABC and @abstractmethod, define PaymentMethod with abstract pay(amount) — so instantiating it raises TypeError — and a concrete subclass UpiPayment implementing pay to return f'paid {amount} via UPI'. ABCs turn "you forgot to override" from a runtime surprise into an instantiation error.

Examples

Example 1

Input

PaymentMethod()

Output

TypeError

Explanation

Abstract classes cannot be instantiated.

Example 2

Input

UpiPayment().pay(250)

Output

'paid 250 via UPI'

Explanation

The concrete subclass fulfils the contract.

Constraints

Inherit from ABC.
Mark pay with @abstractmethod.

Topics

OOPabstract base classes

Companies

StripePayPalAdyen

Hints

Hint 1

from abc import ABC, abstractmethod.

Hint 2

The subclass only needs the one method.

← Count Your Instances Invoice as a dataclass →

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