AttributeError: 'function' object has no attribute '_name_'

def log(text):

    def decorator(func):

        def wrapper(*args,**kw):

            print '%s %s():'%(text,func._name_)

            return func(*args,**kw)

        return wrapper

    return decorator

@log('execute')

def now():

    print '2016-10-20'

print now()

AttributeError: 'function' object has no attribute '_name_'

def log(text):

    def decorator(func):

        def wrapper(*args,**kw):

            print '%s %s():'%(text,func.__name__)

            return func(*args,**kw)

        return wrapper

    return decorator

@log('execute')

def now():

    print '2016-10-20'

print now()

错误就在红色标记处，结果是因为”__doc__“写成了”_doc_“: