Python-将一本字典添加到另一本 [英] Python - add one dictionary to another

问题描述

我想用Python更新一个字典，但是如果有一些相同的参数，则应添加它们的值.例如:

I want to update one dictionary with another in Python, but if there are some same arguments, their values should be added. For example:

a = {"word_1" : 1, "word_2": 2}
b = {"word_2" : 5, "word_3": 7}

输出必须为:

{"word_1" : 1, "word_2": 7, "word_3": 7}

我在Google上搜索了很多，但是在大多数答案中，值都被重写了，我想添加它们这是我的解决方案:

I have googled a lot, but in most answers values rewrites, I want to add them Here is my solution:

    for i in a.keys():
        if i in b.keys():
            b[i] += a[i]
        else:
            b[i] = a[i]

有没有最有效的方法?

推荐答案

使用

Use a Counter, which is a special kind of dictionary for counting objects.

from collections import Counter

a = Counter({"word_1" : 1, "word_2": 2})
b = Counter({"word_2" : 5, "word_3": 7})
print(a + b)

打印

Counter({'word_2': 7, 'word_3': 7, 'word_1': 1})

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