resume picking items from a previous list

[James Stroud]

kpp9c wrote:
> I have a several list of songs that i pick from, lets, say that there
> are 10 songs in each list and there are 2 lists.
> 
> For a time i pick from my songs, but i only play a few of the songs in
> that list... now my wife, Jessica Alba, comes home, and i start playing
> from Jessica's list of songs. After playing a few songs, Jessica, who
> needs her beauty sleep, goes to bed, and i start my play loop which
> starts picking from my songs again...
> 
> The wrinkle:
> only now i want it to pick first from among the 6 songs yet not played
> from the first time around, and *then* when the list is exhausted,
> shuffle the whole original list of songs and start again.
> 
> Here is some working but hilariously bad code that does most of this
> funny biz... I've gotten this far, but can't figure out how to get the
> loops to keep track of what was played and what wasn't and how to
> pick-up the list where it left off.
> 
> I know this is a dumb thing to want to do, but you know, being married
> to bona-fide star is not easy.
> 
> # -----------------------------------------------------------
> #!/usr/bin/env python
> 
> import random
> import os
> 
> def shuffleloop(iterable):
> 	"""An iterator like itertools cycle, which returns elements from the
> 	iterable and saves a copy of each. When the iterable is
> 	exhausted, it return elements from the saved copy.
> 
> 	The added wrinkle here is that the saved copy is randomly shuffled.
> 	Repeats indefinitely."""
> 	saved = []
> 	for element in iterable:
> 		yield element
> 		saved.append(element)
> 	while saved:
> 		random.shuffle(saved)
> 		for element in saved:
> 			yield element
> 
> def playall_reload(startime, playdur, smpl_lst):
> 	'''a loop that shuffles and plays all sounds in a list. If the
> 	sequence is exhausted the list is reloaded, re-shuffled, and plyed
> through
> 	again. It does this as many times as needed to fill the time
> specified.
> 
> 	Also returns the end of the last duration so that the begining of the
> next
> 	section can be fed to the next function or loop.
> 	'''
> 	event = 0; incr = 0; lst_len = len(smpl_lst)
> 	random.shuffle(smpl_lst)
> 	smpl_loop = shuffleloop(smpl_lst)
> 	endpoint = startime + playdur
> 	while startime < endpoint:
> 		sample = smpl_loop.next()
> 		splt = os.path.split(sample)
> 		# get the duration of the current soundfile
> 		# (hard wire it for now)
> 		#incr = DUR()
> 		dur = 10
> 		#load the sample & play it
> 		#
> 		# input(sample)
> 		# PLAY(startime, dur)
> 		#
> 		print "event %d @ %.4f  --> [%s] dur: %.4f" % (event+1, startime,
> splt[1], dur)
> 		incr = dur
> 		startime = startime + incr
> 		event = event + 1
> 	if (event < lst_len):
> 		print "\n\n*** Heads-up yo: <the input sequence was not exhausted>
> ***\n\n"
> 	return startime
> 
> 
> def test():
> 	kevins = ['/Users/kevin/snd/songs/loveisintheair.aif',
> 		'/Users/kevin/snd/songs/boymeetsgirl.aif',
> 		'/Users/kevin/snd/songs/yourcheatingheart.aif',
> 		'/Users/kevin/snd/songs/kindletheflame.aif',
> 		'/Users/kevin/snd/songs/mywifeissohot.aif',
> 		'/Users/kevin/snd/songs/haha.aif',
> 		'/Users/kevin/snd/songs/blueberryorstrawberry.aif',
> 		'/Users/kevin/snd/songs/didyoupaytheelectricbill.aif',
> 		'/Users/kevin/snd/songs/whereistheremote.aif',
> 		'/Users/kevin/snd/songs/youspenthowmuchforthoseshoes.aif']
> 
> 	jessicas = ['/Users/kevin/snd/quiet_songs/iloveu.aif',
> 		'/Users/kevin/snd/quiet_songs/uloveme.aif',
> 		'/Users/kevin/snd/quiet_songs/wearehappy.aif',
> 		'/Users/kevin/snd/quiet_songs/wearesad.aif',
> 		'/Users/kevin/snd/quiet_songs/letsbreakup.aif',
> 		'/Users/kevin/snd/quiet_songs/letsgetbacktogether.aif',
> 		'/Users/kevin/snd/quiet_songs/walkinthesunshine.aif',
> 		'/Users/kevin/snd/quiet_songs/iloveutruly.aif',
> 		'/Users/kevin/snd/quiet_songs/whosefootisthat.aif',
> 		'/Users/kevin/snd/quiet_songs/ohbaby.aif']
> 
> 	print
> 	one = playall_reload(1.00, 20.00, kevins)
> 	print
> 	two = playall_reload(one, 180, jessicas)
> 	print
> 	three = playall_reload(two, 40.00, kevins)
> 
> if __name__ == '__main__':
> 	test()
> 

I didn't read your code, but a class might make it simpler:

class Playah(object):
   def __init__(self, playlist):
     self.playlist = playlist
     self.reset()
   def reset(self):
     self._order = randrange(len(self.playlist))
     self._i = 0
   def next():
     song = self.playlist(self._i)
     self._i += 1
     if self._i > len(self.playlist):
       self.reset()
     return song

You could probably make it an iterable if you tried.

James


-- 
James Stroud
UCLA-DOE Institute for Genomics and Proteomics
Box 951570
Los Angeles, CA 90095

http://www.jamesstroud.com/