os.walk question

[Lanny]

How would one make a list of the files in the top directory
using os.walk.

I need to pick a random file from said list.

Thanks.



-- Posted on news://freenews.netfront.net - Complaints to news@netfront.n et --

[alex23]

Re: os.walk question

On Jul 24, 11:52 am, "Lanny" <la...@freshell s.chwrote:

How would one make a list of the files in the top directory
using os.walk.
>
I need to pick a random file from said list.

So you -only- want the files from one directory?

Try: _, _, files = os.walk('/top/folder/here').next()

The single underscore is a convention to indicate we don't care about
those results.

The .next() is needed to step through os.walk once, which will start
at the path you specify.

Hope this helps.

- alex23

[Fredrik Lundh]

Re: os.walk question

Lanny wrote:

How would one make a list of the files in the top directory
using os.walk.
>
I need to pick a random file from said list.

if you want a list of files from a single directory, use listdir, not walk:

>>import os, random
>>random.choice (os.listdir("/"))

'python25'

</F>

[alex23]

Re: os.walk question

On Jul 23, 5:22 pm, Fredrik Lundh <fred...@python ware.comwrote:

if you want a list of files from a single directory, use listdir, not walk:
>
      >>import os, random
      >>random.choice (os.listdir("/"))
      'python25'

This will include folders as well, though, which isn't what the OP
asked for.

>>import os, random
>>root = "/"
>>random.choice ([f for f in os.listdir(root ) if os.path.isfile( os.path.join(ro ot, f))])

'initrd.img'

It just seems clunky compared to os.walk :)

[Larry Bates]

Re: os.walk question

Fredrik Lundh wrote:

Lanny wrote:
>

>How would one make a list of the files in the top directory
>using os.walk.
>>
>I need to pick a random file from said list.

>
if you want a list of files from a single directory, use listdir, not walk:
>

>>import os, random
>>random.choice (os.listdir("/"))

'python25'
>
</F>
>

Or use glob.

import glob
random.choice([f for f in glob.glob(root, "*")])

-Larry

[Fredrik Lundh]

Re: os.walk question

alex23 wrote:

>if you want a list of files from a single directory, use listdir, not walk:
>>

> >>import os, random
> >>random.choice (os.listdir("/"))

> 'python25'

>
This will include folders as well, though, which isn't what the OP
asked for.

as illustrated by my example (cut and pasted from a windows machine). oops.

random.choice(f ilter(os.path.i sfile, glob.glob("/*")))

isn't that bad, though.

</F>

[alex23]

Re: os.walk question

On Jul 23, 10:11 pm, Larry Bates <larry.ba...@we bsafe.com`wrote :

import glob
random.choice([f for f in glob.glob(root, "*")])

glob.glob only accepts one argument though, did you mean root + "*"?

It also returns folders as well as files, though, and the list
comprehension is not necessary given it returns a list itself.

[alex23]

Re: os.walk question

On Jul 23, 10:26 pm, Fredrik Lundh <fred...@python ware.comwrote:

     random.choice(f ilter(os.path.i sfile, glob.glob("/*")))
>
isn't that bad, though.

I'll agree to that.

[B]

Re: os.walk question

Lanny wrote:

How would one make a list of the files in the top directory
using os.walk.
>
I need to pick a random file from said list.
>
Thanks.
>
>
>
>
-- Posted on news://freenews.netfront.net - Complaints to news@netfront.n et --
>

how about:

import os

x = os.walk('/')
(root,dirs,file s) = x.next()



'files' should contain a list of filenames.

[Lawrence D'Oliveiro]

Re: os.walk question

In message <mailman.514.12 16797917.922.py thon-list@python.org >, Fredrik
Lundh wrote:

Lanny wrote:
>

>How would one make a list of the files in the top directory
>using os.walk.
>>
>I need to pick a random file from said list.

>
if you want a list of files from a single directory, use listdir, not
walk:
>

>>import os, random
>>random.choice (os.listdir("/"))

'python25'

Won't that return any subdirectories as well as files?

[Fredrik Lundh]

Re: os.walk question

Lawrence D'Oliveiro wrote:

Won't that return any subdirectories as well as files?

sure, as was discussed in this very thread two days ago.

</F>

[Eric Wertman]

Re: os.walk question

I do this, mabye a no-no?


import os

for root,dirs,files in os.walk(dir) : break

[Terry Reedy]

Re: os.walk question



Eric Wertman wrote:

I do this, mabye a no-no?

It is a roundabout way to do multiple assignment:

import os

for root,dirs,files in os.walk(dir) : break

root,dirs,files = os.walk(dir).ne xt #2.x
root,dirs,files = next(os.walk(di r))#3.x