#encoding = utf8
import os


def read_files_path(path):
    file_paths = []
    files = os.listdir(path)
    for file in files:
        if not os.path.isdir(file):
            file_paths.append(path + file)
    return file_paths


def mirror_index(size, index):
    # size = len(self.coord_list_cycle)
    turn = index // size
    res = index % size
    if turn % 2 == 0:
        return res
    else:
        return size - res - 1