from random import randint

# get the current glyph
glyph = CurrentGlyph()

# wrap changes in undo context
with glyph.undo('move points randomly'):

    # loop over all contours in glyph
    for contour in glyph:
        # loop over all points in contour
        for point in contour.points:
            # move point by a random distance
            point.x += randint(-20, 20)
            point.y += randint(-20, 20)

    # update glyph
    glyph.changed()