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Python 提取字典的一部分
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Python 提取字典的一部分
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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}Recommend
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