Python Wrapper behaviours

wrapper.py

from functools import wraps

def dec_wrapper(name):
    def dec(func):
        @wraps(func)
        def wrapper(*args, **kw):
            print(name)
            print(args)
            result = func(*args, **kw)
            print('acabou')
            return result
        return wrapper
    if hasattr(name, '__call__'):
        return dec(name)
    return dec

@dec_wrapper('nome do decorator')
def funca(a,b):
    return a+b

@dec_wrapper
def funcb(a,b):
    return a+b


class MyDecorator:
    def __init__(self, name):
        self.name = name

    def __call__(self, func):
        self.func = func
        return self.wrapper

    def wrapper(self,a,b):
        print('oi')
        result = self.func(a,b)
        print('tchau')
        return result

def mydec(*args, **kwargs):
    if args and hasattr(args[0], '__call__'):
        return MyDecorator('no name')(args[0])
    return MyDecorator(*args, **kwargs)

@mydec('nome')
def func2(a,b):
    return a+b

@mydec
def func3(a,b):
    return a+b