How to use the pybombs.pb_logging.logger.getChild function in PyBOMBS

def __init__(self, args, cfg_list, select_prefix=None):
        self.log = pb_logging.logger.getChild("ConfigManager.PrefixInfo")
        self.prefix_dir = None
        self.prefix_cfg_dir = None
        self.prefix_src = None
        self.alias = None
        self.src_dir = None
        self.cfg_file = None
        self.inv_file = None
        self.inventory = None
        self.recipe_dir = None
        self.target_dir = None
        self.env = os.environ.copy()
        self.is_virtualenv = False
        self._cfg_info = OrderedDict(self.default_config_info)
        if select_prefix is not None:
            args.prefix = select_prefix
        # 1) Load the config info

def get_recipe(pkgname, target='package', fail_easy=False):
    """
    Return a recipe object by its package name.
    """
    cache_key = pkgname
    if cache_key in RECIPE_CACHE:
        pb_logging.logger.getChild("get_recipe").trace("Woohoo, this one's already cached ({0})".format(pkgname))
        return RECIPE_CACHE[cache_key]
    try:
        r = Recipe(recipe_manager.recipe_manager.get_recipe_filename(pkgname))
    except PBException as ex:
        if fail_easy:
            return None
        else:
            pb_logging.logger.getChild("get_recipe").error("Error fetching recipe `{0}':\n{1}".format(
                pkgname, str(ex)
            ))
            raise ex
    RECIPE_CACHE[cache_key] = r
    if target is not None and r.target != target:
        if fail_easy:
            return None
        pb_logging.logger.getChild("get_recipe").error(
            "Recipe for `{pkg}' found, but does not match request target type "
            "`{req}' (is `{actual}').".format(
                pkg=pkgname, req=target, actual=r.target))
        raise PBException("Recipe has wrong target type.")
    return r