来自链式调用的Python装饰器

Question

I am trying to create a decorator from a chain of calls. It does not seem to be supported by syntax.

from functools import wraps


class Bar:
    def wrapper(self):
        def _outer(fun):
            @wraps(fun)
            def _f(*a, **kw):
                print('I am in decorator')
                return fun(*a, **kw)
            return _f
        return _outer


def foo():
    return Bar()


# @foo().wrapper()  # Invalid syntax
# def f():
#     pass


# @(foo().wrapper())  # Invalid syntax
# def f():
#     pass


def f():
    pass


f = foo().wrapper()(f)
f()

Am I missing something? For some reasons, such a thing would be extremely useful in my project.

Thanks

Answer 1

You could do this:

wrapper = foo().wrapper()

@wrapper
def foo():
  pass