Convert JSON file to Pandas dataframe

Question

I would like to convert a JSON to Pandas dataframe.

My JSON looks like: like:

{ 
   "country1":{ 
      "AdUnit1":{ 
         "floor_price1":{ 
            "feature1":1111,
            "feature2":1112
         },
         "floor_price2":{ 
            "feature1":1121
         }
      },
      "AdUnit2":{ 
         "floor_price1":{ 
            "feature1":1211
         },
         "floor_price2":{ 
            "feature1":1221
         }
      }
   },
   "country2":{ 
      "AdUnit1":{ 
         "floor_price1":{ 
            "feature1":2111,
            "feature2":2112
         }
      }
   }
}

I read the file from GCP using this code:

project = Context.default().project_id
sample_bucket_name = 'my_bucket'
sample_bucket_path = 'gs://' + sample_bucket_name
print('Object: ' + sample_bucket_path + '/json_output.json')

sample_bucket = storage.Bucket(sample_bucket_name)
sample_bucket.create()
sample_bucket.exists()

sample_object = sample_bucket.object('json_output.json')
list(sample_bucket.objects())
json = sample_object.read_stream()

My goal to get Pandas dataframe which looks like:

I tried using json_normalize, but didn't succeed.

Take a look at this answer, as I think you need to "flatten" the json first for you to use pd.read_json(json.dumps(json_dictionary)) — Zionsof
– Zionsof, Commented Nov 4, 2019 at 13:41

Luc Bertin · Accepted Answer · 2019-11-04 13:50:10Z

5

Nested JSONs are always quite tricky to handle correctly.

A few months ago, I figured out a way to provide an "universal answer" using the beautifully written flatten_json_iterative_solution from here: which unpacks iteratively each level of a given json.

Then one can simply transform it to a Pandas.Series then Pandas.DataFrame like so:

df = pd.Series(flatten_json_iterative_solution(dict(json_))).to_frame().reset_index()

Intermediate Dataframe result

Some data transformation can easily be performed to split the index in the columns names you asked for:

df[["index", "col1", "col2", "col3", "col4"]] = df['index'].apply(lambda x: pd.Series(x.split('_')))

Final result

answered Nov 4, 2019 at 13:50

Luc Bertin

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Comments

Zionsof · Accepted Answer · 2019-11-04 14:15:03Z

You could use this:

def flatten_dict(d):
    """ Returns list of lists from given dictionary """
    l = []
    for k, v in sorted(d.items()):
        if isinstance(v, dict):
            flatten_v = flatten_dict(v)
            for my_l in reversed(flatten_v):
                my_l.insert(0, k)

            l.extend(flatten_v)

        elif isinstance(v, list):
            for l_val in v:
                l.append([k, l_val])

        else:
            l.append([k, v])

    return l

This function receives a dictionary (including nesting where values could also be lists) and flattens it to a list of lists.

Then, you can simply:

df = pd.DataFrame(flatten_dict(my_dict))

Where my_dict is your JSON object. Taking your example, what you get when you run print(df) is:

          0        1             2         3     4
0  country1  AdUnit1  floor_price1  feature1  1111
1  country1  AdUnit1  floor_price1  feature2  1112
2  country1  AdUnit1  floor_price2  feature1  1121
3  country1  AdUnit2  floor_price1  feature1  1211
4  country1  AdUnit2  floor_price2  feature1  1221
5  country2  AdUnit1  floor_price1  feature1  2111
6  country2  AdUnit1  floor_price1  feature2  2112

And when you create the dataframe, you can name your columns and index

marian.vladoi · Accepted Answer · 2019-11-04 15:13:05Z

1

You can try this approach:

 from google.cloud import storage
 import pandas as pd

 storage_client = storage.Client()
 bucket = storage_client.get_bucket('test-mvladoi')
 blob = bucket.blob('file')
 read_output = blob.download_as_string()
 data = json.loads(read_output)

 data_norm = json_normalize(data, max_level=5)
 df = pd.DataFrame(columns=['col1', 'col2', 'col3', 'col4', 'col5'])
 i = 0

 for col in b.columns:
     a,c,d,e = col.split('.')
     df.loc[i]  = [a,c,d,e,b[col][0]]
     i = i + 1

 print(df)

answered Nov 4, 2019 at 15:13

marian.vladoi

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3 Comments

Alexandr Fruman Over a year ago

I work on Google Data Lab and there is some issue with from google.cloud import storage

Alexandr Fruman Over a year ago

tried it. AttributeError: module 'google.datalab.storage' has no attribute 'Client'

marian.vladoi Over a year ago

they deal with storage differently: mybucket = storage.Bucket('BUCKET_NAME'), blob = mybucket.object('file') look on internet

Florian Bernard · Accepted Answer · 2019-11-04 14:18:24Z

Not the best way, but it's work. Also you should modify flatten function that is only picked from this awnser

test = { 
   "country1":{ 
      "AdUnit1":{ 
         "floor_price1":{ 
            "feature1":1111,
            "feature2":1112
         },
         "floor_price2":{ 
            "feature1":1121
         }
      },
      "AdUnit2":{ 
         "floor_price1":{ 
            "feature1":1211
         },
         "floor_price2":{ 
            "feature1":1221
         }
      }
   },
   "country2":{ 
      "AdUnit1":{ 
         "floor_price1":{ 
            "feature1":2111,
            "feature2":2112
         }
      }
   }
}

from collections import defaultdict
import pandas as pd
import collections

def flatten(d, parent_key='', sep='_'):
    items = []
    for k, v in d.items():
        new_key = parent_key + sep + k if parent_key else k
        if isinstance(v, collections.MutableMapping):
            items.extend(flatten(v, new_key, sep=sep).items())
        else:
            items.append((new_key, v))
    return dict(items)

results = defaultdict(list)   
colnames = ["col1", "col2", "col3", "col4", "col5", "col6"]
for key, value in flatten(test).items():
    elements = key.split("_")
    elements.append(value)
    for colname, element in zip(colnames, elements):
        results[colname].append(element)

df = pd.DataFrame(results)
print(df)

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