maya quickrender

playblast.py

import os
import pymel.core as pm

cameras = pm.ls(type=pm.nodetypes.Camera)

for each in cameras:
    val = True if 'preview' in each.name() else False
    if val: playblasting = True
    pm.setAttr(each.renderable,val)
    each.setFilmFit('verticalFilmFit')

name = pm.system.sceneName().replace('.','/').split('/')[-2]
dir = 'c:\\playblast\\'#+name+'\\'
path = dir+name+'.avi'
if not os.path.exists(dir):
    os.makedirs(dir)
if playblasting: pm.animation.playblast(widthHeight = (1136,640), percent=100, format='movie', filename=path)
else: raise Exception ('Fail: no camera with \'preview\' in name')