human
I wrote the below code

    managed_nodes = list((ManagedNode(address=node, distribution=distribution) for node in nodes))
    dispatcher = make_dispatcher(reactor)
    uninstalling = perform(dispatcher, uninstall_flocker(managed_nodes))
    uninstalling.addErrback(write_failure, logger=None)
    def destroy_control_node_state(_):
        return perform(dispatcher, run_remotely(username='root', address=control_node, commands=sequence([run_from_args(['mv', '/var/lib/flocker/current_configuration.json', '/var/lib/flocker/current_configuration.json.old'])])))
    if destroy_persisted_state:
        uninstalling.addCallback(destroy_control_node_state)
    def install(ignored):
        return perform(dispatcher, install_flocker(managed_nodes, package_source))
    uninstalling.addCallback(install)
    def restart_services(ignored):
        restart_commands = sequence([run_remotely(username='root', address=control_node, commands=sequence([task_enable_flocker_control(distribution, 'restart'), if_firewall_available(distribution, task_open_control_firewall(distribution))])), parallel([run_remotely(username='root', address=node.address, commands=sequence([task_enable_docker_plugin(node.distribution), task_enable_flocker_agent(distribution=node.distribution, action='restart')])) for node in managed_nodes])])
        return perform(dispatcher, restart_commands)
    uninstalling.addCallback(restart_services)
    return uninstalling

What's a good function header?

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

def reinstall_flocker_from_package_source(reactor, nodes, control_node, package_source, distribution, destroy_persisted_state=False):