this is a test gist

decorator.txt

def log(utf8_string, tags):
    ...

def log_on_exception(func):
    @functools.wraps(func)
    def wrapper_logon_exception(*args, **kwargs):
        if not tag1 or not tag2:
            return log('an error', tag1, tag2)
        return func(*args, **kwargs)
    return wrapper_logon_exception


@log_on_exception('tag1', 'tag2')
def fn():
    raise Exception('Some message')