Random Problems

[Lanny]

Well the othe day I was making a program to make a list of all the songs in
certian directorys but I got a problem, only one of the directorys was added
to the list. Heres my code:

import random
import os
import glob

songs = glob.glob('C:\D ocuments and Settings\Admin\ My
Documents\LimeW ire\Saved\*.mp3 ')
asongs = glob.glob('C:\D ocuments and Settings\Admin\ My
Documents\Downl oads\*\*.mp3')
songs.append(as ongs)
asongs = glob.glob('C:\D ocuments and Settings\Admin\ My
Documents\Downl oads\*\*\*.mp3' )
songs.append(as ongs)
asongs = glob.glob('C:\D ocuments and Settings\Admin\ My
Documents\Downl oads\*\*\*\*.mp 3')
songs.append(as ongs)
pick = random.choice(s ongs)

all goes well but pick awalys is from the first directory but songs awalys
includes all the files I want it to. Im baffaled.



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[Larry Bates]

Re: Random Problems

Lanny wrote:

Well the othe day I was making a program to make a list of all the songs in
certian directorys but I got a problem, only one of the directorys was added
to the list. Heres my code:
>
import random
import os
import glob
>
songs = glob.glob('C:\D ocuments and Settings\Admin\ My
Documents\LimeW ire\Saved\*.mp3 ')
asongs = glob.glob('C:\D ocuments and Settings\Admin\ My
Documents\Downl oads\*\*.mp3')
songs.append(as ongs)
asongs = glob.glob('C:\D ocuments and Settings\Admin\ My
Documents\Downl oads\*\*\*.mp3' )
songs.append(as ongs)
asongs = glob.glob('C:\D ocuments and Settings\Admin\ My
Documents\Downl oads\*\*\*\*.mp 3')
songs.append(as ongs)
pick = random.choice(s ongs)
>
all goes well but pick awalys is from the first directory but songs awalys
includes all the files I want it to. Im baffaled.
>
>
>
>
-- Posted on news://freenews.netfront.net - Complaints to news@netfront.n et --
>

1) You need to either use raw string for your pathnames or use forward slashes.
This is because backslash is an escape character to Python and if you get any
legal escaped sequence (like \n, \t, etc) it won't work as expected.

songs = glob.glob(r'C:\ Documents and Settings\Admin\ My
Documents\LimeW ire\Saved\*.mp3 ')

or

songs = glob.glob('C:/Documents and Settings/Admin/My
Documents/LimeWire/Saved/*.mp3')

Yes, forward slashes work just fine on windows.

2) When you have a list (songs) and append another list (asongs) you don't get a
combined list, you get a list with the last element being the second list.

example:

>>songs = [1,2,3]
>>asongs = [4,5,6]
>>songs.append( asongs)
>>songs

[1, 2, 3, [4, 5, 6]]

>>>

What you wanted was songs.extend(as ongs). BTW-Inserting a couple of print
statements would have shown you this problem pretty quickly.

-Larry

[Lanny]

Re: Random Problems

1) You need to either use raw string for your pathnames or use forward

slashes.
This is because backslash is an escape character to Python and if you get
any legal escaped sequence (like \n, \t, etc) it won't work as expected.
>
songs = glob.glob(r'C:\ Documents and Settings\Admin\ My
Documents\LimeW ire\Saved\*.mp3 ')
>
or
>
songs = glob.glob('C:/Documents and Settings/Admin/My
Documents/LimeWire/Saved/*.mp3')
>
Yes, forward slashes work just fine on windows.
>
2) When you have a list (songs) and append another list (asongs) you don't
get a combined list, you get a list with the last element being the second
list.
>
example:
>

>songs = [1,2,3]
>asongs = [4,5,6]
>songs.append(a songs)
>songs

[1, 2, 3, [4, 5, 6]]

>>

>
What you wanted was songs.extend(as ongs). BTW-Inserting a couple of print
statements would have shown you this problem pretty quickly.
>
-Larry
>

Thanks for the speedy responce, it really helped



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[Hrvoje Niksic]

Re: Random Problems

"Lanny" <lanny@freshell s.chwrites:

Well the othe day I was making a program to make a list of all the
songs in certian directorys but I got a problem, only one of the
directorys was added to the list. Heres my code:
>
import random
import os
import glob

If you need recursive traversal of directories, try os.walk. For
example:

mp3s = []
for root, subdirs, files in os.walk(r'C:\Do cuments and Settings\Admin\ My Documents\Downl oads'):
for f in files:
if f.endswith('.mp 3'):
mp3s.append(os. path.join(root, f))
# mp3s is now a list of mp3 files under
# C:\Documents and Settings\Admin\ My Documents\Downl oads

[Cousin Stanley]

Re: Random Problems

Well the othe day I was making a program to make a list
of all the songs in certian directorys but I got a problem,
only one of the directorys was added to the list.
....
>

Here's some code .... that illustrates yours ....

import glob

songs = glob.glob( '/path/to/somewhere/*.mp3' )

asongs = glob.glob( 'path/to/somewhere/else/*.mp3' )

songs.append( asongs )

# repeat a few times appending lists from other dirs

all goes well but pick awalys is from the first directory
but songs awalys includes all the files I want it to.

songs.append( asongs ) is appending the entire asongs list
as a single item to the end of the songs list, not adding
each individual song as an entry ....

For example ....

>>l1 = range( 0 , 5 )
>>l2 = range( 5 , 10 )
>>l3 = range( 11 , 15 )
>>>
>>l1

[0, 1, 2, 3, 4]

>>>
>>l2

[5, 6, 7, 8, 9]

>>>
>>l3

[11, 12, 13, 14]

>>>
>>l1.append( l2 )
>>>
>>l1

[0, 1, 2, 3, 4, [5, 6, 7, 8, 9]]

>>>
>>l1.append( l3 )
>>>
>>l1

[0, 1, 2, 3, 4, [5, 6, 7, 8, 9], [11, 12, 13, 14]]

So, if you have a lot of entries in the original songs list
you're only adding a few entries to it in the form of another
list and most likely you didn't run enough random.choice tests
to flush out a pick that turned out to be one of the entire
asong lists that you added ....

You might try something like the following
where each tune gets added individually to
the song pool .... un-tested ....


# -------------------------------------------------------------------

import random
import glob

base_dir = 'c:/Documents and Settings/Admin/My Documents'

list_subdirs = [
'LimeWire/Saved/*.mp3' ,
'Downloads/*/*.mp3' ,
'Downloads/*/*/*.mp3' ,
'Downloads/*/*/*/*.mp3 ]

song_pool = [ ]

for this_dir in list_subdirs :

list_songs = glob.glob( "'%s/%s'" % ( base_dir , this_dir )

if list_songs :

for this_song in list_songs :

song_pool.appen d( this_song )

npicks = 41

print

for n in range( npicks ) :

this_pick = random.choice( song_pool )

print ' ' , this_pick

# -------------------------------------------------------------------


--
Stanley C. Kitching
Human Being
Phoenix, Arizona

[Cousin Stanley]

Re: Random Problems

list_songs = glob.glob( "'%s/%s'" % ( base_dir , this_dir )

Missed a closing paren ....

list_songs = glob.glob( "'%s/%s'" % ( base_dir , this_dir ) )

Still .... NOT Tested


--
Stanley C. Kitching
Human Being
Phoenix, Arizona

[Cousin Stanley]

Re: Random Problems

>Well the othe day I was making a program to make a list
>of all the songs in certian directorys but I got a problem,
>only one of the directorys was added to the list.
>Heres my code:
>>
>import random
>import os
>import glob
>>
>songs = glob.glob('C:\D ocuments and Settings\Admin\ My
>Documents\Lime Wire\Saved\*.mp 3')
>>
>asongs = glob.glob('C:\D ocuments and Settings\Admin\ My

From: Edwin.Madari@ve rizonwireless.c om
To: "Cousin Stanley" <cousinstanley@ gmail.com>,
python-list@python.org
Date: Yesterday 07:28:18 pm

use songs.extend( asongs ) # append is for single item
# - where ever it might be.

>>l1 = range(5)        
>>l2 = range(5,10)
>>l1

[0, 1, 2, 3, 4]

>>l2

[5, 6, 7, 8, 9]

>>l1.extend(l 2)
>>l1

[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

>>>

And ....

Thanks to Edwin Madari for reminding me about
the extend method available for lists which
I had totally forgotten about ....


--
Stanley C. Kitching
Human Being
Phoenix, Arizona