OOP · hard

40. Abstract base classes

Define enforced interfaces.

Write abstract class `ChainClient(ABC)` with abstract method `get_balance(self, address)`, then `MockClient(ChainClient)` implementing it to always return `1.5`.

Required in your answer: ABC@abstractmethodclass MockClient

Runs via Pyodide

from abc import ABC, abstractmethod

class ChainClient(ABC):
    @abstractmethod
    def get_balance(self, address):
        ...

class MockClient(ChainClient):
    # TODO: implement get_balance
    pass

Output appears here.

← 39. async/await with asyncio 41. Operator overloading →