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Composition over Inheritance: How to Build a Wallet Account in Python

Demonstrates composition by wrapping a WalletAccount class in an AuditedWallet decorator-like class to add behavior without changing the original class.

composition design-patterns oop

Python

class WalletAccount:
    def __init__(self, owner, balance=0.0):
        self.owner = owner
        self.balance = balance

    def deposit(self, amount):
        if amount <= 0:
            raise ValueError("Deposit must be positive")
        self.balance += amount
        return self.balance

    def withdraw(self, …

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