How to use 'add two dictionaries python' in Python

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63def 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

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