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def render_in_batch():
    import subprocess
    import maya.cmds as mc
    import os
    import sys
    mc.file(save =1 )
    file = mc.file(q=1,sn=1)

    maya_render = os.path.join(os.path.split(sys.executable)[0], 'Render.exe')
    if os.path.exists(maya_render):
        proc = subprocess.Popen('"%s" -r mr -v 4 "%s"'%(maya_render,file),stdout=subprocess.PIPE )
        for i in range(200000):
            output = proc.stdout.readline()
            if "%" in output:
                pass
            print output.rstrip()
            if output is "":
                print "RENDER IS DONE!"
                break
    else:
        print "maya executable not found"
render_in_batch()