[docs] Looks like there should be walk() instead of listdir()

[Victor Varvariuc]

http://docs.python.org/library/os.html#os.walk

...
> By default errors from the listdir()<http://docs.python.org/library/os.html#os.listdir> call
> are ignored. If optional argument *onerror* is specified, it should be a
> function; it will be called with one argument, an OSError<http://docs.python.org/library/exceptions.html#exceptions.OSError>
>  instance.
> ...

<http://docs.python.org/library/os.html#os.walk>

Looks like there should be walk() instead of listdir()

-- 
Victor Varvariuc
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