python - 在返回最后一次迭代的for循环中生成字典

Question

我正在遍历以下 JSON:

 "item 1": { 
    "property 1": "value 1",
    "property 2": "value 2",
    "property 3": "value 3"
},
"item 2": {
    "property 1": "value 1",
    "property 2": "value 2",
    "property 3": "value 3"
}

我想用前两个键的值制作一个字典 - property 1, property 2 - 对于每个项目(即排除 property 3)。下面的代码实现了预期的结果，但只存储了最近的序列:

for i in JSON:
    value 1 = i["value 1"]
    value 2 = i["value 2"]
    ...
    JSON = json.dumps({'property 1':value 1,'property 2':value 2...})
return json.loads(JSON)

>> "item 2": {
   "property 1": "value 1",
   "property 2": "value 2" ...
   # returns item 2, but I'd like item 1 also

如何存储每个 item 的输出而不覆盖另一个？

Answer 1

使用简单的迭代。

例如:

data = {"item 1": { 
    "property 1": "value 1",
    "property 2": "value 2",
    "property 3": "value 3"
},
"item 2": {
    "property 1": "value 1",
    "property 2": "value 2",
    "property 3": "value 3"
}
}

d = {}
for i in data:
    d[i] = {"property 1": data[i]["property 1"], "property 2": data[i]["property 2"]}
print( d )

输出:

{'item 2': {'property 1': 'value 1', 'property 2': 'value 2'}, 'item 1': {'property 1': 'value 1', 'property 2': 'value 2'}}