from visad import Real, Unit, RealType
from visad.python.JPythonMethods import *

degC = makeUnit("degC")
tc = getRealType("tempsC", degC)
t2 = Real(tc, 10)

rtk = getRealType("kelvin", SI.kelvin)
t1 = Real(rtk, 255)

average = (t1 + t2) / 2
print "average =",average,average.getUnit()