def execute(self): if self.strategy: return self.strategy() return "Waiting..."
Domain-Driven Design focuses on the core business logic. In Python, this involves creating a clear boundary between the "inside" of your application (the domain) and the "outside" (the database, APIs, and UI). Entity and Value Objects
@app.get("/users/") async def get_users(): return users python architecture patterns pdf
A simple interface to a complex library (like a video converter).
A news agency notifying subscribers.
# Implementation using a Decorator def singleton(cls): instances = {} def wrapper(*args, **kwargs): if cls not in instances: instances[cls] = cls(*args, **kwargs) return instances[cls] return wrapper
def update(self, message): print(f"self.name received: message") def execute(self): if self
# Switching strategy at runtime soldier.strategy = defensive_strategy print(soldier.execute()) # Output: Defending!
In this example, we define a simple Flask application with a single endpoint to retrieve users. This is a basic monolithic architecture, where all components are part of a single application. A news agency notifying subscribers
# Sample in-memory data store data = [ "id": 1, "name": "John Doe", "id": 2, "name": "Jane Doe" ]