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From: Peter Otten <__peter__@web.de>
Newsgroups: comp.lang.python
Subject: Re: Duplicate Output
Date: Wed, 27 Jan 2016 10:19:59 +0100
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Peter Otten wrote:

> or use next():
> 
> filenames = next(walk("."))[2]
> print(filenames)

Be warned though that if you try this with a non-existent or otherwise 
inaccessible directory you will get an exception: 

$ sudo mkdir forbidden
$ sudo chmod a-r forbidden
$ python3 -c 'import os; next(os.walk("forbidden"))'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
StopIteration