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63 def add_dicts_ext(add_func=lambda a, b: a+b, zero=0): 64 def add_dicts(*dicts): 65 res = {} 66 for d in dicts: 67 for k, v in d.iteritems(): 68 res[k] = add_func(res.get(k, zero), v) 69 return dict((k, v) for k, v in res.iteritems() if v != zero) 70 return add_dicts