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Python 提取字典的一部分

 3 years ago
source link: https://www.lfhacks.com/tech/subdictionary-python/
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Python 提取字典的一部分

发布日期 2014-04-02
最后修改 2021-10-09
预计阅读时间 1 分钟
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Python如何提取提取字典的一部分，即子字典(sub-dictionary)？

比如已有字典

{'A':1, 'B':2, 'C':3, 'D':4, 'E':5}

['C', 'E']

{'C':3, 'E':5}

可以用以下方法提取子字典：

base = {'A':1, 'B':2, 'C':3, 'D':4, 'E':5}subkey = ['C', 'E']print(dict([(key, base[key]) for key in subkey])) #{'C': 3, 'E': 5}

Python总有不止一种办法解决问题：

使用dict comprehension

base = {'A':1, 'B':2, 'C':3, 'D':4, 'E':5}subkey = ['C', 'E']print({key:base[key] for key in subkey}) #{'C': 3, 'E': 5}

使用unpack

base = {'A':1, 'B':2, 'C':3, 'D':4, 'E':5}subkey = ['C', 'E']print({k:v for k,v in base.items() if k in subkey}) #{'C': 3, 'E': 5}

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