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

    def find_xblock_info(xblock_info, locator):
        '\n                                Finds    the    xblock    info    for    the    specified    locator.\n                                '
        if (xblock_info['id'] == locator):
            return xblock_info
        children = (xblock_info['child_info']['children'] if xblock_info.get('child_info', None) else None)
        if children:
            for child_xblock_info in children:
                result = find_xblock_info(child_xblock_info, locator)
                if result:
                    return result
        return None
    def collect_all_locators(locators, xblock_info):
        '\n                                Collect    all    the    locators    for    an    xblock    and    its    children.\n                                '
        locators.append(xblock_info['id'])
        children = (xblock_info['child_info']['children'] if xblock_info.get('child_info', None) else None)
        if children:
            for child_xblock_info in children:
                collect_all_locators(locators, child_xblock_info)
    selected_xblock_info = find_xblock_info(course_structure, locator_to_show)
    if (not selected_xblock_info):
        return None
    expanded_locators = []
    collect_all_locators(expanded_locators, selected_xblock_info)
    return {'locator_to_show': locator_to_show, 'expanded_locators': expanded_locators}

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

def course_outline_initial_state(locator_to_show, course_structure):