[pygtk] what arguments are textbuffer.serialize need?

[无姓无名]

a=3Dgtk.TextBuffer()
start, end =3D a.get_bounds()
b=3Da.serialize(a, "application/x-gtk-text-buffer-rich-text", start, end)

Traceback (most recent call last):
  File "<pyshell#17>", line 1, in <module>
    b=3Da.serialize(a, "application/x-gtk-text-buffer-rich-text", start, en=
d)
RuntimeError: more argument specifiers than keyword list entries

gtk.TextBuffer.serialize

    def serialize(content_buffer, format, start, end)

content_buffer :    the gtk.TextBuffer to serialize
format :    the rich text format to use for serializing
start :    start of block of text to serialize
end :    end of block of test to serialize
Returns :    the serialized data, encoded as format

what arguments are textbuffer.serialize need?
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