I solved this problem. I still don't understand why, but it seems Python was appending a reference to the first element at the end of the list, rather than copying the data. I used something like: "self.regionlist.append(list(self.regionlist[self.hregion])" and now it works fine, i.e., altering the appended list member doesn't change the copied one.
-Chuckk On Sat, Jun 7, 2008 at 5:53 PM, Chuckk Hubbard <[EMAIL PROTECTED]> wrote: > Hello. > This program is clunky, I know; I'm not a programmer, but I need to > use this program, so I'm writing it. > The problem: > I have a cursor following the mouse that shows frequency ratios of > potential notes in relation to 1/1 (something like Middle C). At any > time, the user may hit "t" to move 1/1 to wherever the cursor is. > There is also the option to use many regions, so that some of the > notes in the score, in region 0, for instance, can have 1/1 as their > base, and others, in region 1 for instance, could have perhaps 3/2 as > their base. > > The program starts out with 2 existing regions, region 0 = 1/1, and > region 1 = 3/2. If the user hits r+NUM, the cursor switches to region > NUM. If NUM is longer than the list of regions (self.regionlist), a > new region is appended with the same base as the current one, and the > cursor goes to that region. > > SO, if you start this program, then: > 1) move the cursor around a little; > 2) hit 'r' and '1' at the same time - now you are in region 1; > 3) hit 'r' and '0', now region 0; > 4) hit 'r' and '2', now a new region 2 is created with the same > parameters as region 0, and self.regionlist is appended with the new > info - now you're in region 2; > 5) move the mouse until the fraction reads anything other than 1/1; > 6) hit 't' to transpose the current region by that fraction; > > You can see by the output in the text window that self.regionlist[0] > AND self.regionlist[2] have been updated. Only [2] should have been > changed. > > 7) hit 'r' and '0', and see that region 0 has now changed its base to > match region 2. > > I hope someone is curious enough to get through this and help me. I > tried extracting the function in question into its own mini-file and > the problem didn't happen. I can't think of any reason these lines: > > self.regionlist[self.hregion][0] = self.curnum > self.regionlist[self.hregion][1] = self.curden > self.regionlist[self.hregion][3] = self.octave11 = self.yadj > > should change self.regionlist[0] AND self.regionlist[2] in the same > call, but they do. Also, if I add more regions in series, they all > update each other. > > Thanks for your time. > > -Chuckk > > -- > http://www.badmuthahubbard.com > -- http://www.badmuthahubbard.com -- http://mail.python.org/mailman/listinfo/python-list
