human
I wrote the below code

    def log_with_instance(*args, **kwargs):
        'Wrapper    for    LOG.info(*args,    **kwargs,    instance=instance).'
        if (instance is not None):
            kwargs['instance'] = instance
        LOG.info(*args, **kwargs)
    eng = tf_eng.load(flow)
    with tf_tm.PrintingDurationListener(eng, printer=log_with_instance):
        return eng.run()

What's a good function header?

=====
Here's a good function header?
assistant
#Here's a good function header.

def run(flow, instance=None):