6.8. Decorator Method

  • MyClass is a class containing decorator

  • mydecorator is a decorator name

  • myfunction is a function name

  • func is a reference to function which is being decorated

Definition:

>>> class MyClass:
...     @staticmethod
...     def mydecorator(func):
...         def wrapper(*args, **kwargs):
...             return func(*args, **kwargs)
...         return wrapper

Usage:

>>> @MyClass.mydecorator
... def say_hello():
...     return 'hello'
>>>
>>>
>>> say_hello()
'hello'

6.8.1. Use Case - 1

  • FastAPI URL Routing

>>> 
... from fastapi import FastAPI
...
... app = FastAPI()
...
...
... @app.get('/')
... async def index():
...     return {'message': 'Hello World'}
...
...
... @app.get('/user/{pk}')
... async def user(pk: int):
...     return {'pk': pk}
...
...
... @app.get('/search')
... async def items(q: str | None = None):
...     return {'q': q}