在字典列表中找到相同的键值对的最佳方法

Question

If I have a list of dictionaries such as

[{'D': 'wet', 'W': 'sun'}, {'D': 'wet', 'W': 'rain'}, {'D': 'wet', 'W': 'sun'}]

What would be the best way to detect if there is a Key-Value pair that is identical between all dictionaries in the list. So in this case, "D" : "Wet" would be identical because it is the same across all the Key and Values of the list of dictionaries. However, the "W" will not be because it has more a >1 domain (sun and rain are both in the domain of the W key).

Answer 1

您还可以利用内置在集合中的交集属性

dict(set.intersection(*(set(d.items()) for d in dicts)))

Answer 2

Use .items() to convert each dictionary into an iterable of (key, value) tuples, convert those iterables to sets, then collapse them all with intersection:

reduce(lambda a, b: a & b,
       (set(d.items()) for d in
        [{'D': 'wet', 'W': 'sun'}, {'D': 'wet', 'W': 'rain'}, {'D': 'wet', 'W': 'sun'}]))

In Python 3 you will need from functools import reduce .