[pygtk] textbuffer.serialize() arguments? winxp os

[无姓无名]

windows xp pro sp2 chs
gtk+ runtime env 2.10.6-1
python 2.5 pycairo 1.2.6
python 2.5 pygobject 2.12.3
python 2.5 pygtk 2.10-1
python 2.5.1 stackless

a=gtk.TextBuffer()
start, end = a.get_bounds()
b=a.serialize(a, "application/x-gtk-text-buffer-rich-text", start, end)

Traceback (most recent call last):
  File "<pyshell#17>", line 1, in <module>
    b=a.serialize(a, "application/x-gtk-text-buffer-rich-text", start, end)
RuntimeError: more argument specifiers than keyword list entries