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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _update_system_file(system_file, name, new_kvs):
 """Update the bcbio_system.yaml file with new resource information. """

    if os.path.exists(system_file):
        bak_file = system_file + ".bak%s" % datetime.datetime.now().strftime("%Y-%m-%d-%H-%M-%S")
        shutil.copyfile(system_file, bak_file)
        with open(system_file) as in_handle:
            config = yaml.safe_load(in_handle)
    else:
        utils.safe_makedir(os.path.dirname(system_file))
        config = {}
    new_rs = {}
    added = False
    for rname, r_kvs in config.get("resources", {}).items():
        if rname == name:
            for k, v in new_kvs.items():
                r_kvs[k] = v
            added = True
        new_rs[rname] = r_kvs
    if not added:
        new_rs[name] = new_kvs
    config["resources"] = new_rs
    with open(system_file, "w") as out_handle:
        yaml.safe_dump(config, out_handle, default_flow_style=False, allow_unicode=False)