def index_time_series_list(time_series_list, index):
    """indexes a python list, using a numpy array

    Args:
        time_series_list (List of time Series)
        index (numpy array)

    Returns:
        List of time Series: new time series list, indexed by the index array
    """
    new_time_series_list = []
    for i in index:
        new_time_series_list.append(time_series_list[i])
    return new_time_series_list