[pygtk] Pango Gravity

[David G. Mackay]

I see that pygtk 2.12 has the bindings for the pango gravity
capabilities, but I can't quite make it do what I want.  First off, I
can't find the path to specify PANGO_GRAVITY_SOUTH (or EAST, etc.).  A
get_base_gravity returns an enum of type PangoGravity, but how do I
reference it?  Next, I want to be able to mix standard layout text and
vertical text running bottom to top (rotated counter clockwise 90
degrees).  Calling set_base_gravity with an integer value of 2 rotates
the text 180 degrees, but values of 0, 1, and 3 give me a standard text
layout.

Unfortunately, the online reference doesn't yet cover 2.12.  Can anyone
point me to additional documentation or code snippets that cover this?

Thanks,
Dave