If by rv session you mean playing what it got render, then it should be easy.
dont have nuke nor python in front of me, but it should be something like this:

main scrip that launches the image sequence in rv
#rvafterRender.py

import nuke
import subprocess as sub
def rvthis(clip):
    rv = '/path/to/rv'
    rvflags = '-play -ns' #add non clip rv flags here, display luts, etc

    clipflags ='-flielut' #add clip flags, file luts, etc

    cmd = '%s %s [%s %s]' % (rv, rvflags, clip,clipflags)
    sub.Popen(cmd, shell = True)

The on your menu.py 

from rvafterRender import rvthis


Then on "after render" callback
rvthis(nuke.thisNode()['file'].value())

later will check if all this is true





________________________________
From: Misho Ristov <[email protected]>
To: Nuke user discussion <[email protected]>
Sent: Friday, September 23, 2011 1:20 PM
Subject: [Nuke-users] make an rv session on render end

Hi,

I'm trying to make an "after render" script that will create a rv session file 
with all the write nodes as a sequence.
Any start suggestions?


Misho

-- ___________________________
Misho Ristov
VFX Supervisor
FX3X
www.fx3x.com
Jane Sandanski 108/28
1000 Skopje, Macedonia
cell   +38970385680
office +38925511901
fax    +38925511902

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