Aggregation vs Composition

Exactly right ✅

Let’s break it down simply:

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🧩 Aggregation

• Object is created outside

• Then passed into another class

• Loosely connected → Can exist independently

Copyclass Customer:
    def __init__(self, name):
        self.name = name

class BankAccount:
    def __init__(self, customer, balance):
        self.customer = customer  # Aggregation
        self.balance = balance

Copycust = Customer("Maham")
acc = BankAccount(cust, 5000)

• cust exists outside BankAccount

• Even if acc is deleted, cust is still safe

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🧱 Composition

• Object is created inside

• Fully owned by the outer class

• Strong connection → Dies with the parent

Copyclass BankAccount:
    def __init__(self, name, balance):
        self.customer = Customer(name)  # Composition
        self.balance = balance

• If BankAccount is deleted → Customer inside is gone too

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Easy Summary:

Let me know if you want a story analogy too (like Bank hiring a person vs owning a locker).