[SciPy-User] Curse of recursive directory walking

josef.pktd@gmai... josef.pktd@gmai...
Thu Jul 30 08:04:00 CDT 2009


On Wed, Jul 29, 2009 at 11:19 PM, Gökhan SEVER<gokhansever@gmail.com> wrote:
>
>
> On Wed, Jul 29, 2009 at 6:25 PM, <josef.pktd@gmail.com> wrote:
>>
>> On Wed, Jul 29, 2009 at 5:14 PM, Gökhan SEVER<gokhansever@gmail.com>
>> wrote:
>> >
>> >
>> > On Wed, Jul 29, 2009 at 9:48 AM, <josef.pktd@gmail.com> wrote:
>> >>
>> >> To me it looks more like it is a problem with relative file paths and
>> >> changing directories and not with recursion.
>> >> I never had problems with os.walk or any home made recursive directory
>> >> walker, but I always used absolute paths.
>> >>
>> >> from the python 2.5 docs
>> >>
>> >> Note: If you pass a relative pathname, don't change the current
>> >> working directory between resumptions of walk(). walk() never changes
>> >> the current directory, and assumes that its caller doesn't either.
>> >>
>> >> Josef
>> >
>> >
>> > I have one more question on os.walk()
>> >
>> > For some reason while this function working on my local folders I walks
>> > through them in a randomly manner. However when I run the same script on
>> > a
>> > network mounted drive (using the same directory structure) it walks
>> > through
>> > them in an alphabetically sorted order.
>> >
>> > Have you encountered a similar behaviour before?
>>
>> I only use windows, and it looks like I get windows fileordering,
>> alphabetically, independent of capitalization, and not capitalized
>> names sorted first. So I assume that the ordering depends on the
>> operating system.
>>
>> to get deterministic ordering, inplace sorting should be possible, but
>> I never tried
>> python help: When topdown is true, the caller can modify the dirnames
>> list in-place
>>
>> help for os.listdir says about the list of directory entries:  "The
>> list is in arbitrary order"
>>
>> Josef
>>
>
> This is Fedora 11.
>
> I still couldn't figure out why os.walk() preserves the fileordering
> properly on samba mounted folders but not on my same local copies. The weird
> thing is it always walks the given directory tree in the same arbitrary
> order whenever I called the script.
>
> Inplace listing may not be a good option, 1st I don't know how to do that,
> and second when a directory under a given path is reached and if the desired
> file exists under that directory it will execute my plotting script. It
> works but a bizarre way :)
>
> Maybe I should ask on a python mailing list.
>
> --
> Gökhan
>
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>

something like this might work.

>>> for r,d,f in os.walk(r'C:\path\of\directory'):
	d.sort()
	d.reverse()
	print r

this gives me walking the tree in reverse, python-alphabetical order
(capital letters first)

Josef


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