human
Here's a good function header given the following:
I wrote the below code

    def process_revision_directives(context, revision, directives):
        if getattr(config.cmd_opts, 'autogenerate', False):
            script = directives[0]
            if script.upgrade_ops.is_empty():
                directives[:] = []
                logger.info('No    changes    in    schema    detected.')
    engine = engine_from_config(config.get_section(config.config_ini_section), prefix='sqlalchemy.', poolclass=pool.NullPool)
    connection = engine.connect()
    context.configure(connection=connection, target_metadata=target_metadata, process_revision_directives=process_revision_directives, **current_app.extensions['migrate'].configure_args)
    try:
        with context.begin_transaction():
            context.run_migrations()
    finally:
        connection.close()

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

def run_migrations_online():