Martin Drautzburg wrote: > Steve Holden wrote: > > >>> y = s1*2 + s2(align=10) >>> >>> which should iterate as >>> >>> Time=1,'a' >>> Time=2,'a' >>> Time=10,'b' >>> >>> I have no difficulty passing "align" to the object (using __call__) >>> and use it while I furnish my own __iter__() method. However I don't >>> quite see how I can do this with bare itertools, though I may be >>> wrong here. >>> >>> Bare in mind that it is not only about somehow getting the job done. >>> The beauty of the resulting syntax is also important. >>> >> In that case why not just assume that the timing of a sequence is >> relative to the current time unless the "align" argument is given? > > Well that's pretty much what I'm doing. I just fail to see how I can do > this with bare itertools. Currently I am doing it in the following way: > > When I call a Sequence as in s2(align=2) I create a new Sequence where > the "align" value is simply stored in an instance variable. > > When creating the sum of two sequences, I create a Sequence with a new > iter() method which first iterates over self and then over the second > Sequence. But each time it has to look up the "align" value of the > respective sequence and adjust "time" accordingly. > > Appending the two Sequences is the easy part, but adjusting time is the > difficult part. My impression was, that itertools can only help to > solve the first part. > > I may be missing something obvious. If that's the case, please let me > know. > Perhaps I am assuming too much of your simulation environment/player.
I presumed that there would be a global "current time" value that would be passed into or available to the play method of the sequences. However I can see that you might need something more complex if (e.g.) you want to be able to start playing at an arbitrary point in time. regards Steve -- Steve Holden +1 571 484 6266 +1 800 494 3119 PyCon is coming! Atlanta, Feb 2010 http://us.pycon.org/ Holden Web LLC http://www.holdenweb.com/ UPCOMING EVENTS: http://holdenweb.eventbrite.com/ -- http://mail.python.org/mailman/listinfo/python-list
