You can use the `functools.wraps` decorator to deal with copying all (most) metadata from the wrapped function:

    def trace(fn):
        @functools.wraps(fn)
        def worker(*args):
            logging.info('Called %s with args %r', fn.__name__, args)
            return fn(*args)
        return worker

Docs: http://docs.python.org/3/library/functools.html#functools.wr...