Decorators: The Python Feature That Looks Like Magic

Something has been quietly happening in code you have never written yet. Every time you use FastAPI to build an endpoint, you will write this: @app.get ( " /users " ) def get_users (): return users Every time you time how long a function takes, people write this: @timer def train_model (): ... Every time Flask defines a route, every time you cache a result, every time you check if a user is logged in before running a function, that @ symbol is right there at the top. You have probably seen it an