如何创建具有装饰器属性的装饰器？

Question

I have seen decorators like this, how do I create them?

@deco.deco_attribute
def add(a, b):
    return a + b

I know how to create a decorator, that looks something like this

import time

def timer(func):
    def wrapper(*args, **kwargs):
        time_in = time.time()
        x = func(*args, **kwargs)
        time_out = time.time()
        print(time_out - time_in)
        return x
    return wrapper

@timer
def add(a, b):
    return a + b

and have even seen examples of adding arguments to a decorator, which could be accomplished using nested functions.

def timer(*deco_args):
    def inner(func):
        def wrapper(*args, **kwargs):
            time_in = time.time()
            x = func(*args, **kwargs)
            time_out = time.time()
            print(*deco_args, time_out - time_in)
            return x
        return wrapper
    return inner

@timer(2, 3)
def add(a, b):
    return a + b

Other variations that I am aware of include, nesting multiple decorators or creating a class as a decorator, or creating a function as a decorator for a class.

But how to create the decorator mentioned on top?

Answer 1

You can use class and put every decorator inside it

class deco():
  @staticmethod
  def time_1(func):
    def inner():
      return 0 
    return inner

  @staticmethod
  def time_2(func):
    def inner():
      return 0 
    return inner


@deco.time_1
def test():
  return 4+5

Answer 2

I think its just a matter of how you do the import. In your example you would have only imported the module import deco and then accessed the decorator inside that module as you would with any other function. One place I often see the module being imported rather the decorator is pytest fixtures:

import pytest

@pytest.fixture
def my_fixture():
...