How to use the gphoto2.gp_camera_folder_list_files function in gphoto2

def list_camera_files(camera, path='/'):
    """ Returns a list of all the image files on the camera """
    result = []
    # get files
    for name, value in gp.check_result(
            gp.gp_camera_folder_list_files(camera, path)):
        result.append(os.path.join(path, name))
    # read folders
    folders = []
    for name, value in gp.check_result(
            gp.gp_camera_folder_list_folders(camera, path)):
        folders.append(name)
    # recurse over subfolders
    for name in folders:
        result.extend(list_camera_files(camera, os.path.join(path, name)))
    return result

def list_camera_files(camera, path='/'):
    result = []
    # get files
    gp_list = gp.check_result(
        gp.gp_camera_folder_list_files(camera, path))
    for name, value in gp_list:
        result.append(os.path.join(path, name))
    # read folders
    folders = []
    gp_list = gp.check_result(
        gp.gp_camera_folder_list_folders(camera, path))
    for name, value in gp_list:
        folders.append(name)
    # recurse over subfolders
    for name in folders:
        result.extend(list_camera_files(camera, os.path.join(path, name)))
    return result

def list_files(camera, path='/'):
    result = []
    # get files
    for name, value in gp.check_result(
            gp.gp_camera_folder_list_files(camera, path)):
        result.append(os.path.join(path, name))
    # read folders
    folders = []
    for name, value in gp.check_result(
            gp.gp_camera_folder_list_folders(camera, path)):
        folders.append(name)
    # recurse over subfolders
    for name in folders:
        result.extend(list_files(camera, os.path.join(path, name)))
    return result

def list_camera_files(camera, path='/'):
    """ Returns a list of all the image files on the camera """
    result = []
    # get files
    for name, value in gp.check_result(
            gp.gp_camera_folder_list_files(camera, path)):
        result.append(os.path.join(path, name))
    # read folders
    folders = []
    for name, value in gp.check_result(
            gp.gp_camera_folder_list_folders(camera, path)):
        folders.append(name)
    # recurse over subfolders
    for name in folders:
        result.extend(list_camera_files(camera, os.path.join(path, name)))
    return result

def list_files(camera, path='/'):
    result = []
    # get files
    for name, value in gp.check_result(
            gp.gp_camera_folder_list_files(camera, path)):
        result.append(os.path.join(path, name))
    # read folders
    folders = []
    for name, value in gp.check_result(
            gp.gp_camera_folder_list_folders(camera, path)):
        folders.append(name)
    # recurse over subfolders
    for name in folders:
        result.extend(list_files(camera, os.path.join(path, name)))
    return result