如何从嵌套字典中删除具有重复值的字典 [英] How to remove dictionaries with duplicate values from a nested dictionary

问题描述

我有一个包含键值对的字典，其中的值也是字典:

I have a dictionary that contains key value pairs where the values are also dictionaries:

{ 
    'item1':{'name':'filename', 'size':1024},
    'item2':{'name':'filename', 'size':1024},
    'item3':{'name':'diff_filename', 'size':1024},
    'item4':{'name':'diff_filename', 'size':1024}
}

我想删除字典中值重复的文件名"字段，从而得到结果的项目:

I want to remove items in the dictionary that have duplicate 'filename' fields in their values giving me the result:

{ 
    'item1':{'name':'filename', 'size':1024},
    'item3':{'name':'diff_filename', 'size':1024}
}

推荐答案

使用辅助set跟踪您已经看到的文件名:

Use an auxiliary set to track what filenames you have seen already:

seen = set()
{k: v for k, v in yourdict.iteritems() 
    if v['name'] not in seen and (seen.add(v['name']) or True)}

或者，更具可读性:

seen = set()
filtered = dict()
for k, v in yourdict.iteritems():
    if v['name'] in seen:
        continue
    seen.add(v['name'])
    filtered[k] = v

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