不可哈希类型：“dict”类型错误[重复]

假设我有这本字典：

items = {1: {'title': u'testing123', 'description': u'testing456'},
2: {'description': u'testing123', 'description': u'testing456'},
3: {'description': u'testing123', 'description': u'testing456'},
4: {'description': u'testing123', 'description': u'testing456'},
5: {'description': u'testing123', 'description': u'testing456'},
6: {'description': u'somethingelse', 'description': u'somethingelse'}}

我想过滤掉重复的值，这样最终我会得到

{1: {'title': u'testing123', 'description': u'testing456'}, 6: {'title': u'something', 'description': u'somethingelse'}}

我写了这段代码：

dic = {}

for key, value in items.items():
    if not set(value.values()).issubset(set(dic.values())):
        dic[key] = value

但是我收到错误消息TypeError: unhashable type: 'dict'。我不确定为什么会发生这种情况以及如何解决它。

这是受到启发的另一个问题 https://stackoverflow.com/questions/27435395/removing-duplicate-items-by-value-within-a-dict以及我尝试解决它的失败。

dic.values() 返回字典列表

>>> for key, value in items.items():
...     print dic.values()
...
[{'description': u'testing456', 'title': u'testing123'}]
[{'description': u'testing456', 'title': u'testing123'}]
[{'description': u'testing456', 'title': u'testing123'}]
[{'description': u'testing456', 'title': u'testing123'}]
[{'description': u'testing456', 'title': u'testing123'}]
[{'description': u'testing456', 'title': u'testing123'}]
>>>

因此，您不能在 dict 上应用 set，因为 dict 不可散列。

顺便说一句，你可以通过以下方式修复它：

>>> dic = {}
>>> for key, value in items.items():
...     if not set(value.values()).issubset(set(sum([x.values() for x in dic.values()],[]))):
...         dic[key] = value
...
>>> dic
{1: {'description': u'testing456', 'title': u'testing123'}, 6: {'description':     u'somethingelse', 'title': u'somethingelse'}}
>>>

对于 python > 3.x

if not set(value.values()).issubset(set(sum([list(x.values()) for x in list(dic.values())],[]))):