python - 如何合并具有相同键的字典

Question

我有一个这样的数据结构:

    [ {'SNAPSHOT': {'SnapshotVersion': '304'}},

      {'SNAPSHOT': {'SnapshotCreationDate': '2015-06-21 17:33:41'}},


      {'CafeData': {'CafeVersion': '2807'}}, 

      {'CafeData': {'IsSoftwareOnly': '1'}}, 

      {'CafeData'{'IsPassportTCPIP': '1'}} 

]
输出应该是这样的:

 [ {'SNAPSHOT': {'SnapshotVersion': '304','SnapshotCreationDate': '2015-06-21 17:33:41'}},

   {'CafeData': {'CafeVersion': '2807','IsSoftwareOnly': '1','IsPassportTCPIP': '1'}} 
 
]

Answer 1

使用 https://docs.python.org/3/library/collections.html#collections.defaultdict每当遇到新键时，它都会在 defaultdict 中创建一个 dict。

import collections as co

dd = co.defaultdict(dict)

l = [ {'SNAPSHOT': {'SnapshotVersion': '304'}},
      {'SNAPSHOT': {'SnapshotCreationDate': '2015-06-21 17:33:41'}},
      {'CafeData': {'CafeVersion': '2807'}}, 
      {'CafeData': {'IsSoftwareOnly': '1'}}, 
      {'CafeData': {'IsPassportTCPIP': '1'}} ]

for i in l: 
    for k,v in i.items(): 
        dd[k].update(v) 

结果:

In [8]: dd
Out[8]: 
defaultdict(dict,
            {'SNAPSHOT': {'SnapshotVersion': '304',
              'SnapshotCreationDate': '2015-06-21 17:33:41'},
             'CafeData': {'CafeVersion': '2807',
              'IsSoftwareOnly': '1',
              'IsPassportTCPIP': '1'}})