There are several different modules for graphing in Python which you can find easily by searching, but to my knowledge none of them will simply take in a set of tuples and turn them into what you want, although I am sure that it is certainly possible to program a app that could do that for you...
If you can't/don't want to program such an app and you don't have many data points, you could probably just cook one up using Photoshop/GIMP/ MSPaint, or whatnot (although clearly I could understand not wanting to do that for 100's of points)... sounds like an interesting project an auto lifeline maker that takes in data points...hmm -- http://mail.python.org/mailman/listinfo/python-list
