python dict.add_by_value(dict_2)?

by

Easiest to just use a Counter

>>> from collections import Counter
>>> a = dict(a=1,b=2    )
>>> b = dict(    b=3,c=2)
>>> Counter(a)+Counter(b)
Counter({'b': 5, 'c': 2, 'a': 1})
>>> dict(Counter({'b': 5, 'c': 2, 'a': 1}))
{'a': 1, 'c': 2, 'b': 5}

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