How to get an ordered list of coordinates of a curve?

Hi, Given a 2D image of a closed or open curve, as the outline of a binary particle or a skeleton,I am wondering how to get an order list of the pixels coordinates (I found something in the opencv documentation <http://opencv.willowgarage.com/documentation/python/imgproc_structural_analy...>, but I am unable to call fincontours from python. For som reasons, I write import opencv then if I try opencv.findcontour, findcontour is not available in the list of my python ide<https://picasaweb.google.com/100950875858888510591/Spyder#5591405906862620322>( spyder <http://packages.python.org/spyder/>); I hope I am clear ) Thanks for your advice. Jean-Patrick