the best thing todo is to draw the glyph into a pen store and process the data and draw it back into the glyph

this should work :)

enjoy

from robofab.pens.pointPen import AbstractPointPen

class SortingPen(AbstractPointPen):
    
    def __init__(self):
        self._contours = []
        
    def beginPath(self):
        self._contours.append([])
                       
    def addPoint(self, pt, segmentType=None, smooth=False, name=None, **kwargs):
        self._contours[-1].append((pt, segmentType, smooth, name, kwargs))
    
    def endPath(self):
        pass

    def addComponent(self, baseGlyph, transformation):
        pass   
            
    def drawPoints(self, pen):
        # sort by the len of oncurves and offcurvers for each contour
        sortable = []
        for contour in self._contours:
            oncurves = 0
            offcurves = 0
            for pt, segmentType, smooth, name, kwargs in contour:
                if segmentType is None:
                    offcurves += 1
                else:
                    oncurves += 1
            sortable.append((oncurves, offcurves, contour))
        sortable.sort()

        for oncurvers, offcurvers, contour in sortable:
            pen.beginPath()
            for pt, segmentType, smooth, name, kwargs in contour:
                pen.addPoint(pt, 
                            smooth=smooth, 
                            segmentType=segmentType, 
                            name=name, 
                            **kwargs)
            pen.endPath()
        
     

# get the current glyph
g = CurrentGlyph()
# get the pen
sorting = SortingPen()
# draw into that pen
g.drawPoints(sorting)
# clear the contours
g.clearContours()
# draw back into the glyph
sorting.drawPoints(g.getPointPen())

use:

g = CurrentGlyph()

contour = g[1]
contour.selected = True
g.update()