将键值放入 Python 字典列表中

Question

I have a python dictionary that looks something like this:

{
    "hits": [
    {
       "_source": {
           "network": "att",
           "month": january,
           "volume": "30",
           "mass": 3,
       }
    },
    {
       "_source": {
           "network": "vzn",
           "month": june,
           "volume": "10",
           "mass": 2,
         }
     }
  ]
}

I'd like to take this dictionary and put some things in lists. For example, I'd like to get all the element's mass and volume and put them in a list format like so:

mass = [3,2]
volume = [30, 10]

I know I can create a loop and loop through each element of the json and add it to each list, but I was wondering if there was a built in or more elegant way of doing this.

Answer 1

A list-comprehension option:

mass_list = 'mass:', [i['_source']['mass'] for i in d['hits']]

volume_list = 'volume:', [i['_source']['volume'] for i in d['hits']]

output:

print(mass_list)   # mass: [3, 2]
print(volume_list) # volume: ['30', '10']

Answer 2

Here is the code:

a={
    "hits": [
    {
       "_source": {
           "network": "att",
           "month": 'january',
           "volume": "30",
           "mass": 3,
       }
    },
    {
       "_source": {
           "network": "vzn",
           "month": 'june',
           "volume": "10",
           "mass": 2,
         }
     }
  ]
}

a=a.items();

mass=[]
volume=[]

for value in a:
    for k in value[1]:
        k=list(k.items());
        volume.append(k[0][1]['volume'])
        mass.append(k[0][1]['mass'])

print(mass)
print(volume)