#!/usr/bin/python3

import os

file_list = os.listdir()
for file in file_list:
    if os.path.isfile(file):
        print(file)
    else:
        print(file,'/', sep='')

        # go into that directory and do the same thing again
        # note - this is not the final answer for what we want to do, but it's a step in the right direction
        file_list2 = os.listdir(file)
        for file2 in file_list2:
            if os.path.isfile(file2):
                print(file,'/',file2)
            else:
                # go into that directory and do the same thing again
                print(file,'/',file2,sep='')