def shiftGrid(infile, outfile, variable, latShift=0, lonShift=-280):
if os.path.exists(outfile): os.remove(outfile)
thisfile=cdms2.open(infile)
thisLon = thisfile[variable].getLongitude()
thisLon[:].data[:] = (thisLon[:].data[:] - lonShift)%360
newvar = cdms2.createVariable(MV.array(thisfile[variable][:]), id=variable, fill_value=1.e20)
newvar.setAxisList((thisfile[variable].getTime(), thisfile[variable].getLatitude(), thisLon))
if os.path.exists(outfile): os.remove(outfile)
outFile = cdms2.open(outfile,'w')
outFile.write(newvar)
thisfile.close()
outFile.close()
sys.exit(1)
