import functools
import inspect

def dec(method):
    x= 1
    @functools.wraps(method)
    def wrapper(*args, **kwargs):
        x 
        return method(*args, **kwargs)
    return wrapper

class A:
    @dec
    def f1(self):
        print(is_wrapped())


def is_wrapped():
    frame = inspect.currentframe().f_back
    caller = frame.f_back
    if len(caller.f_locals) > 0:
        last_elem = next(reversed(frame.f_back.f_locals.values()))
        if hasattr(last_elem, '__code__'):
            return last_elem.__code__ is frame.f_code

    return False


A().f1()