在字典列表中查找公用键值对的pythonic方法 [英] pythonic way to find common key value pair among list of dict

问题描述

我有一个字典清单。

alljson = [{'EchoTime': 0,
  'FlipAngle': 90,
  'MRAcquisitionType': '2D',
  'MagneticFieldStrength': 3,
  'Manufacturer': 'SIEMENS',
  'ManufacturerModelName': 'TrioTim',
  'RepetitionTime': 2,
  'ScanOptions': 'FS',
  'ScanningSequence': 'AP',
  'SequenceVariant': 'SK',
  'TaskName': 'Tom'},
 {'EchoTime': 0,
  'FlipAngle': 90,
  'MRAcquisitionType': '2D',
  'MagneticFieldStrength': 3,
  'Manufacturer': 'SIEMENS',
  'ManufacturerModelName': 'TrioTim',
  'RepetitionTime': 2,
  'ScanOptions': 'FS',
  'ScanningSequence': 'EP',
  'SequenceVariant': 'SK',
  'TaskName': 'fb'},
 {'EchoTime': 0,
  'FlipAngle': 90,
  'MRAcquisitionType': '2D',
  'MagneticFieldStrength': 3,
  'Manufacturer': 'SIEMENS',
  'ManufacturerModelName': 'TrioTim',
  'RepetitionTime': 2,
  'ScanOptions': 'FS',
  'ScanningSequence': 'EP',
  'SequenceVariant': 'HK', 
  'TaskName': 'Tom-loc'}]

<现在我打算从字典列表中找到所有常见的键值对。
这是最Python的方式。

Now i intend to find all common key value pairs from the list of dict. what would be the most pythonic way to do it.

注意：键和值都应该匹配，并且所有字典中都应存在k：v对

Note: key and value both should match, and k:v pair should exist in all dict

I在此处中尝试了所有建议的解决方案，但给出了值不可散列，所有解决方案均无法完全解决。

I tried all solutions suggested here but given values are non hashable, none of the solution fully works.

有什么建议吗？

推荐答案

将每个字典的项目列表转换为集合，找到集合的交集，然后有选择地将结果转换回字典：

Convert each dictionary's list of items into a set, find the set intersection, and optionally convert the result back to a dictionary:

dict(set.intersection(*[set(d.items()) for d in alljson]))
#{'MRAcquisitionType': '2D', 'FlipAngle': 90, 'RepetitionTime': 2,
# 'ScanOptions': 'FS', 'ManufacturerModelName': 'TrioTim', 
# 'Manufacturer': 'SIEMENS', 'SequenceVariant': 'SK', 'EchoTime': 0, 
# 'MagneticFieldStrength': 3, 'ScanningSequence': 'EP'}

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