def BuildHooksEnv(self):
    return {
      "GROUP_NAME": self.op.group_name,
      "NEW_ALLOC_POLICY": self.op.alloc_policy,
      }
s + s2 -> New Struct made from s.merge(s2).
dataset/ETHPy150Open ganeti/ganeti/lib/cmdlib/group.py/LUGroupSetParams.BuildHooksEnv--crossover with--dataset/ETHPy150Open ipython/ipython-py3k/IPython/utils/ipstruct.py/Struct.__add__