def adder(p, c, dt=None):
        dt = dt + datetime.timedelta(365)
        return {'ab': p['a'] + p['b'], 'dd': c[0]['d'] + c[1]['d'], 'dt': dt}
Create a new valid mapreduce_spec.
dataset/ETHPy150Open uwdata/termite-data-server/web2py/gluon/contrib/pysimplesoap/server.py/adder--crossover with--dataset/ETHPy150Open GoogleCloudPlatform/appengine-mapreduce/python/test/mapreduce/handlers_test.py/MapreduceHandlerTestBase.create_mapreduce_spec