The documentation you linked to says that the function is only available in pyGTK 2.10 or later so your version is too old to have it.
Question
For some reason I'm getting 'no attribute' errors when trying to get or set grid lines when using PyGTK:
import gtk
t = gtk.TreeView()
print t.get_grid_lines()
Gives:
'AttributeError: 'gtk.TreeView' object has no attribute 'get_grid_lines'
Here is the relevant documentation entry: http://www.pygtk.org/docs/pygtk/class-gtktreeview.html#method-gtktreeview--get-grid-lines
And my pyGTK version is 2.4.1 and my gtk version is 2.4.9 which leaves me with no clue as to why I can't get at this function when everything else works.
Solution
Licensed under: CC-BY-SA with attribution
Not affiliated with StackOverflow