def points(self, source, x, y, agg=None):
        from .glyphs import Point
        from .reductions import count
        if agg is None:
            agg = count()
        return bypixel(source, self, Point(x, y), agg)
Like shutil.rmtree, but try to work around some win32 wierdness.
dataset/ETHPy150Open bokeh/datashader/datashader/core.py/Canvas.points--crossover with--dataset/ETHPy150Open cloudmatrix/esky/esky/util.py/really_rmtree