从两个字典中添加值 [英] Add values from two dictionaries

问题描述

dict1 = {a: 5, b: 7}
dict2 = {a: 3, c: 1}

result {a:8, b:7, c:1}

如何获得结果?

推荐答案

这是一个单行代码，可以做到这一点:

this is a one-liner that would do just that:

dict1 = {'a': 5, 'b': 7}
dict2 = {'a': 3, 'c': 1}

result = {key: dict1.get(key, 0) + dict2.get(key, 0)
          for key in set(dict1) | set(dict2)}
# {'c': 1, 'b': 7, 'a': 8}

请注意，set(dict1) | set(dict2)是两个词典的键集.如果键存在，则dict1.get(key, 0)返回dict1[key]，否则返回0.

note that set(dict1) | set(dict2) is the set of the keys of both your dictionaries. and dict1.get(key, 0) returns dict1[key] if the key exists, 0 otherwise.

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