Json to Pandas Dataframe

JSON to pandas DataFrame

I found a quick and easy solution to what I wanted using json_normalize() included in pandas 1.01.

from urllib2 import Request, urlopen
import json

import pandas as pd    

path1 = '42.974049,-81.205203|42.974298,-81.195755'
request=Request('http://maps.googleapis.com/maps/api/elevation/json?locations='+path1+'&sensor=false')
response = urlopen(request)
elevations = response.read()
data = json.loads(elevations)
df = pd.json_normalize(data['results'])

This gives a nice flattened dataframe with the json data that I got from the Google Maps API.

Convert Pandas DataFrame to JSON format

The output that you get after DF.to_json is a string. So, you can simply slice it according to your requirement and remove the commas from it too.

out = df.to_json(orient='records')[1:-1].replace('},{', '} {')

To write the output to a text file, you could do:

with open('file_name.txt', 'w') as f:
    f.write(out)

How to return a .csv file/Pandas DataFrame in JSON format using FastAPI?

The below shows four different ways of returning the data stored in a .csv file/Pandas DataFrame.

Option 1

The first option is to convert the file data into JSON and then parse it into a dict. You can optionally change the orientation of the data using the orient parameter in the .to_json() method.

Note: Better not to use this option. See Updates below.

from fastapi import FastAPI
import pandas as pd
import json

app = FastAPI()
df = pd.read_csv("file.csv")

def parse_csv(df):
    res = df.to_json(orient="records")
    parsed = json.loads(res)
    return parsed
    
@app.get("/questions")
def load_questions():
    return parse_csv(df)

Update 1: Using .to_dict() method would be a better option, as it would return a dict directly, instead of converting the DataFrame into JSON (using df.to_json()) and then that JSON string into dict (using json.loads()), as described earlier. Example:
```
@app.get("/questions")
def load_questions():
    return df.to_dict(orient="records")
```
Update 2: When using .to_dict() method and returning the dict, FastAPI, behind the scenes, automatically converts that return value into JSON, using the jsonable_encoder. Thus, to avoid that extra processing, you could still use .to_json() method, but this time, put the JSON string in a Response and return it directly, as shown below.
```
from fastapi import Response

@app.get("/questions")
def load_questions():
    return Response(df.to_json(orient="records"), media_type="application/json")
```

Option 2

Another option is to return the data in string format, using .to_string() method.

@app.get("/questions")
def load_questions():
    return df.to_string()

Option 3

You could also return the data as an HTML table, using .to_html() method.

from fastapi.responses import HTMLResponse

@app.get("/questions")
def load_questions():
    return HTMLResponse(content=df.to_html(), status_code=200)

Option 4

Finally, you can always return the file as is using FastAPI's FileResponse.

from fastapi.responses import FileResponse

@app.get("/questions")
def load_questions():
    return FileResponse(path="file.csv", filename="file.csv")

Convert URL Request from JSON to Pandas DataFrame

Try this

import pandas as pd

df = pd.read_json('https://data.epa.gov/efservice/PUB_DIM_FACILITY/ROWS/0:10/JSON')

FACILITY_ID LATITUDE    LONGITUDE   CITY    STATE   ZIP COUNTY_FIPS COUNTY  ADDRESS1    ADDRESS2    ... REPORTED_INDUSTRY_TYPES FACILITY_TYPES  SUBMISSION_ID   UU_RD_EXEMPT    REPORTING_STATUS    PROCESS_STATIONARY_CML  COMMENTS    RR_MRV_PLAN_URL RR_MONITORING_PLAN  RR_MONITORING_PLAN_FILENAME
0   1000001 48.828707   -122.685533 FERNDALE    WA  98248   53073   WHATCOM COUNTY  5105 LAKE TERRELL ROAD  NaN ... D   Direct Emitter  176997  NaN NaN NaN NaN NaN NaN NaN
1   1000001 48.828707   -122.685533 FERNDALE    WA  98248   53073   WHATCOM COUNTY  5105 LAKE TERRELL ROAD  NaN ... C   Direct Emitter  5752    NaN NaN NaN NaN NaN NaN NaN

Normalizing nested JSON object into Pandas dataframe

Personally, I would not use pd.json_normalize for this case. Your JSON is quite complex, and unless you're really experienced with json_normalize, the following code may take less time to understand for the average dev. In fact, you don't even need to see the JSON to understand exactly what this code does (although it would certainly help ;).

First, we can extract the objects (portfolios and their children) from the JSON into a list, and use a series of steps to get them in the right form and order:

def prep_obj(o):
    """Prepares an object (portfolio/child) from the JSON to be inserted into a dataframe."""
    return {
        'New Entity Group': o['name'],
    } | o['columns']


# Get a list of lists, where each sub-list contains the portfolio object at index 0 and then the portfolio object's children:
groups = [[prep_obj(o), *[prep_obj(child) for child in o['children']]] for o in api_response['data']['attributes']['total']['children']]

# Sort the portfolio groups by their number:
groups.sort(key=lambda g: int(g[0]['New Entity Group'].split('_')[1]))

# Reverse the children of each portfolio group:
groups = [[g[0]] + g[1:][::-1] for g in groups]

# Flatten out the groups into one large list of objects:
objects = [obj for group in groups for obj in group]
# The above is exactly equivalent to the following:
#   objects = []
#   for group in groups:
#       for obj in group:
#           objects.append(obj)

Next, create the dataframe:

# Create a mapping for column names so that their display names can be used:
mapping = {col['key']: col['display_name'] for col in api_response['meta']['columns']}

# Create a dataframe from the list of objects:
df = pd.DataFrame(objects)

# Correct column names:
df = df.rename(mapping, axis=1)
# Reorder columns:
column_names = ["New Entity Group", "Entity ID", "Adjusted Value (1/31/2022, No Div, USD)", "Adjusted TWR (Current Quarter, No Div, USD)", "Adjusted TWR (YTD, No Div, USD)", "Annualized Adjusted TWR (Since Inception, No Div, USD)", "Inception Date", "Risk Target"]
df = df[column_names]

And formatting:

def format_twr_col(col):
    return (
        col
        .abs()
        .mul(100)
        .round(2)
        .pipe(lambda s: s.where(s.eq(0) | s.isna(), '(' + s.astype(str) + '%)'))
        .pipe(lambda s: s.where(s.ne(0) | s.isna(), s.astype(str) + '%'))
        .fillna('-')
    )

def format_value_col(col):
    positive_mask = col.ge(0)

    col[positive_mask] = (
        col[positive_mask]
        .round()
        .astype(int)
        .map('${:,}'.format)
    )

    col[~positive_mask] = (
        col[~positive_mask]
        .astype(float)
        .round()
        .astype(int)
        .abs()
        .map('(${:,})'.format)
    )
    
    return col

df['Adjusted TWR (Current Quarter, No Div, USD)'] = format_twr_col(df['Adjusted TWR (Current Quarter, No Div, USD)'])
df['Annualized Adjusted TWR (Since Inception, No Div, USD)'] = format_twr_col(df['Annualized Adjusted TWR (Since Inception, No Div, USD)'])
df['Adjusted TWR (YTD, No Div, USD)'] = format_twr_col(df['Adjusted TWR (YTD, No Div, USD)'])

df['Adjusted Value (1/31/2022, No Div, USD)'] = format_value_col(df['Adjusted Value (1/31/2022, No Div, USD)'].copy())

df['Inception Date'] = pd.to_datetime(df['Inception Date']).dt.strftime('%b %d, %Y')

df['Entity ID'] = df['Entity ID'].fillna('')

And... voilà:

>>> pd.options.display.max_columns = None
>>> df
         New Entity Group Entity ID Adjusted Value (1/31/2022, No Div, USD)  Adjusted TWR (Current Quarter, No Div, USD) Adjusted TWR (YTD, No Div, USD)  Annualized Adjusted TWR (Since Inception, No Div, USD) Inception Date  Risk Target
0             Portfolio_1                                          $260,786                                     (44.55%)                        (44.55%)                                            (44.55%)       Apr 07, 2021          N/A
1  The FW Irrev Family Tr   9552252                                $260,786                                         0.0%                            0.0%                                                0.0%       Jan 11, 2022          N/A
2             Portfolio_2                                       $18,396,664                                      (5.78%)                         (5.78%)                                             (5.47%)       Sep 03, 2021       Growth
3                  FW DAF  10946585                             $18,396,664                                      (5.78%)                         (5.78%)                                             (5.47%)       Sep 03, 2021       Growth
4             Portfolio_3                                       $60,143,818                                      (4.42%)                         (4.42%)                                             (7.75%)       Dec 17, 2020          NaN
5     The FW Family Trust  13014080                                $475,356                                       (6.1%)                          (6.1%)                                             (3.97%)       Apr 09, 2021   Aggressive
6       FW Liquid Fund LP  13396796                             $52,899,527                                      (4.15%)                         (4.15%)                                             (4.15%)       Dec 30, 2021   Aggressive
7   FW Holdings No. 2 LLC   8413655                              $6,768,937                                      (0.77%)                         (0.77%)                                            (11.84%)       Mar 05, 2021          N/A
8         FW and FR Joint   9957007                                    ($1)                                            -                               -                                                   -       Dec 21, 2021          N/A

convert text into json using pandas dataframe with customer delimiter

It seems the problem is with the status part not being separated by a delimiter. You can fight it by adding some processing in pandas to split the date column on the status keyword and stripping out the colon before writing to json:

# Splits the date part and the status part into two columns (your status is being dragged into the date column)
cam_details[['date', 'status']] = cam_details['date'].map(lambda x: x.split('status')).tolist()

# Clean up the status column which still has the colons and extra whitespaces
cam_details['status'] = cam_details['status'].map(lambda x: x.replace(':', '').strip())

Convert Nested DateTime json to Pandas DataFrame

Why don't you just do this?

pd.DataFrame(data["Time Series (Daily)"]).T.reset_index().rename(columns = {"index":"Time Series (Daily)"})

Output -

	Time Series (Daily)	1. open	4. close
0	2001-06-31	113.2000	113.8000
1	2001-07-01	114.2000	114.2000

Mapping complex JSON to Pandas Dataframe

jsonpath-ng can parse even such a nested json object very easily. You can install this convenient library by the following command:

pip install --upgrade jsonpath-ng

Code:

import json
import jsonpath_ng as jp
import pandas as pd

def unpack_response(r):
    # Create a dataframe from extracted data
    expr = jp.parse('$..children.[*]')
    data = [{'full_path': str(m.full_path), **m.value} for m in expr.find(r)]
    df = pd.json_normalize(data).sort_values('full_path', ignore_index=True)

    # Append a portfolio column
    df['portfolio'] = df.loc[df.full_path.str.contains(r'total\.children\.\[\d+]$'), 'name']
    df['portfolio'].fillna(method='ffill', inplace=True)

    # Deal with columns
    trans = {'columns.' + c['key']: c['display_name'] for c in r['meta']['columns']}
    cols = ['full_path', 'portfolio', 'name', 'entity_id', 'Adjusted Value (No Div, USD)', 'Current Quarter TWR (USD)', 'YTD TWR (USD)', 'TWR Audit Note']
    df = df.rename(columns=trans)[cols]

    return df

# Load the sample data from file
# with open('api_response_2022-02-13.json', 'r') as f:
#     api_response = json.load(f)

# Load the sample data from string
api_response = json.loads('{"meta": {"columns": [{"key": "value", "display_name": "Adjusted Value (No Div, USD)", "output_type": "Number", "currency": "USD"}, {"key": "time_weighted_return", "display_name": "Current Quarter TWR (USD)", "output_type": "Percent", "currency": "USD"}, {"key": "time_weighted_return_2", "display_name": "YTD TWR (USD)", "output_type": "Percent", "currency": "USD"}, {"key": "_custom_twr_audit_note_911328", "display_name": "TWR Audit Note", "output_type": "Word"}], "groupings": [{"key": "_custom_name_747205", "display_name": "* Reporting Client Name"}, {"key": "_custom_new_entity_group_453577", "display_name": "NEW Entity Group"}, {"key": "_custom_level_2_624287", "display_name": "* Level 2"}, {"key": "legal_entity", "display_name": "Legal Entity"}]}, "data": {"type": "portfolio_views", "attributes": {"total": {"name": "Total", "columns": {"time_weighted_return": -0.046732301295604683, "time_weighted_return_2": -0.046732301295604683, "_custom_twr_audit_note_911328": null, "value": 23132492.905107163}, "children": [{"name": "Falconer Family", "grouping": "_custom_name_747205", "columns": {"time_weighted_return": -0.046732301295604683, "time_weighted_return_2": -0.046732301295604683, "_custom_twr_audit_note_911328": null, "value": 23132492.905107163}, "children": [{"name": "Wealth Bucket A", "grouping": "_custom_new_entity_group_453577", "columns": {"time_weighted_return": -0.045960317420568164, "time_weighted_return_2": -0.045960317420568164, "_custom_twr_audit_note_911328": null, "value": 13264448.506587159}, "children": [{"name": "Asset Class A", "grouping": "_custom_level_2_624287", "columns": {"time_weighted_return": 3.434094574039648e-06, "time_weighted_return_2": 3.434094574039648e-06, "_custom_twr_audit_note_911328": null, "value": 3337.99}, "children": [{"entity_id": 10604454, "name": "HUDJ Trust", "grouping": "legal_entity", "columns": {"time_weighted_return": 3.434094574039648e-06, "time_weighted_return_2": 3.434094574039648e-06, "_custom_twr_audit_note_911328": null, "value": 3337.99}, "children": []}]}, {"name": "Asset Class B", "grouping": "_custom_level_2_624287", "columns": {"time_weighted_return": -0.025871339096964152, "time_weighted_return_2": -0.025871339096964152, "_custom_twr_audit_note_911328": null, "value": 1017004.7192636987}, "children": [{"entity_id": 10604454, "name": "HUDG Trust", "grouping": "legal_entity", "columns": {"time_weighted_return": -0.025871339096964152, "time_weighted_return_2": -0.025871339096964152, "_custom_twr_audit_note_911328": null, "value": 1017004.7192636987}, "children": []}]}, {"name": "Asset Class C", "grouping": "_custom_level_2_624287", "columns": {"time_weighted_return": -0.030370376329670656, "time_weighted_return_2": -0.030370376329670656, "_custom_twr_audit_note_911328": null, "value": 231142.67772000004}, "children": [{"entity_id": 10604454, "name": "HKDJ Trust", "grouping": "legal_entity", "columns": {"time_weighted_return": -0.030370376329670656, "time_weighted_return_2": -0.030370376329670656, "_custom_twr_audit_note_911328": null, "value": 231142.67772000004}, "children": []}]}, {"name": "Asset Class D", "grouping": "_custom_level_2_624287", "columns": {"time_weighted_return": -0.05382756475465478, "time_weighted_return_2": -0.05382756475465478, "_custom_twr_audit_note_911328": null, "value": 9791282.570000006}, "children": [{"entity_id": 10604454, "name": "HUDW Trust", "grouping": "legal_entity", "columns": {"time_weighted_return": -0.05382756475465478, "time_weighted_return_2": -0.05382756475465478, "_custom_twr_audit_note_911328": null, "value": 9791282.570000006}, "children": []}]}, {"name": "Asset Class E", "grouping": "_custom_level_2_624287", "columns": {"time_weighted_return": -0.01351630404081805, "time_weighted_return_2": -0.01351630404081805, "_custom_twr_audit_note_911328": null, "value": 2153366.6396034593}, "children": [{"entity_id": 10604454, "name": "HJDJ Trust", "grouping": "legal_entity", "columns": {"time_weighted_return": -0.01351630404081805, "time_weighted_return_2": -0.01351630404081805, "_custom_twr_audit_note_911328": null, "value": 2153366.6396034593}, "children": []}]}, {"name": "Asset Class F", "grouping": "_custom_level_2_624287", "columns": {"time_weighted_return": -0.002298190175237247, "time_weighted_return_2": -0.002298190175237247, "_custom_twr_audit_note_911328": null, "value": 68313.90999999999}, "children": [{"entity_id": 10604454, "name": "HADJ Trust", "grouping": "legal_entity", "columns": {"time_weighted_return": -0.002298190175237247, "time_weighted_return_2": -0.002298190175237247, "_custom_twr_audit_note_911328": null, "value": 68313.90999999999}, "children": []}]}]}, {"name": "Wealth Bucket B", "grouping": "_custom_new_entity_group_453577", "columns": {"time_weighted_return": -0.04769870075659244, "time_weighted_return_2": -0.04769870075659244, "_custom_twr_audit_note_911328": null, "value": 9868044.398519998}, "children": [{"name": "Asset Class A", "grouping": "_custom_level_2_624287", "columns": {"time_weighted_return": 2.8632718065191298e-05, "time_weighted_return_2": 2.8632718065191298e-05, "_custom_twr_audit_note_911328": null, "value": 10234.94}, "children": [{"entity_id": 10868778, "name": "2012 Desc Tr HBO Thalia", "grouping": "legal_entity", "columns": {"time_weighted_return": 2.82679297198829e-05, "time_weighted_return_2": 2.82679297198829e-05, "_custom_twr_audit_note_911328": null, "value": 244.28}, "children": []}, {"entity_id": 10643052, "name": "2013 Irrev Tr HBO Thalia", "grouping": "legal_entity", "columns": {"time_weighted_return": 4.9373572795108345e-05, "time_weighted_return_2": 4.9373572795108345e-05, "_custom_twr_audit_note_911328": null, "value": 5081.08}, "children": []}, {"entity_id": 10598341, "name": "Cht 11th Tr HBO Shirley", "grouping": "legal_entity", "columns": {"time_weighted_return": 6.609603754315074e-06, "time_weighted_return_2": 6.609603754315074e-06, "_custom_twr_audit_note_911328": null, "value": 1523.62}, "children": []}, {"entity_id": 10598337, "name": "Cht 11th Tr HBO Hannah", "grouping": "legal_entity", "columns": {"time_weighted_return": 1.0999769004760296e-05, "time_weighted_return_2": 1.0999769004760296e-05, "_custom_twr_audit_note_911328": null, "value": 1828.9}, "children": []}, {"entity_id": 10598334, "name": "Cht 11th Tr HBO Lau", "grouping": "legal_entity", "columns": {"time_weighted_return": 6.466673995619843e-06, "time_weighted_return_2": 6.466673995619843e-06, "_custom_twr_audit_note_911328": null, "value": 1557.06}, "children": []}]}, {"name": "Asset Class B", "grouping": "_custom_level_2_624287", "columns": {"time_weighted_return": -0.024645947842438676, "time_weighted_return_2": -0.024645947842438676, "_custom_twr_audit_note_911328": null, "value": 674052.31962}, "children": [{"entity_id": 10868778, "name": "2012 Desc Tr HBO Thalia", "grouping": "legal_entity", "columns": {"time_weighted_return": -0.043304004172576405, "time_weighted_return_2": -0.043304004172576405, "_custom_twr_audit_note_911328": null, "value": 52800.96}, "children": []}, {"entity_id": 10643052, "name": "2013 Irrev Tr HBO Thalia", "grouping": "legal_entity", "columns": {"time_weighted_return": -0.022408434778798836, "time_weighted_return_2": -0.022408434778798836, "_custom_twr_audit_note_911328": null, "value": 599594.11962}, "children": []}, {"entity_id": 10598341, "name": "Cht 11th Tr HBO Shirley", "grouping": "legal_entity", "columns": {"time_weighted_return": -0.039799855483646174, "time_weighted_return_2": -0.039799855483646174, "_custom_twr_audit_note_911328": null, "value": 7219.08}, "children": []}, {"entity_id": 10598337, "name": "Cht 11th Tr HBO Hannah", "grouping": "legal_entity", "columns": {"time_weighted_return": -0.039799855483646174, "time_weighted_return_2": -0.039799855483646174, "_custom_twr_audit_note_911328": null, "value": 7219.08}, "children": []}, {"entity_id": 10598334, "name": "Cht 11th Tr HBO Lau", "grouping": "legal_entity", "columns": {"time_weighted_return": -0.039799855483646174, "time_weighted_return_2": -0.039799855483646174, "_custom_twr_audit_note_911328": null, "value": 7219.08}, "children": []}]}, {"name": "Asset Class C", "grouping": "_custom_level_2_624287", "columns": {"time_weighted_return": -0.03037038746301135, "time_weighted_return_2": -0.03037038746301135, "_custom_twr_audit_note_911328": null, "value": 114472.69744}, "children": [{"entity_id": 10868778, "name": "2012 Desc Tr HBO Thalia", "grouping": "legal_entity", "columns": {"time_weighted_return": -0.030370390035505124, "time_weighted_return_2": -0.030370390035505124, "_custom_twr_audit_note_911328": null, "value": 114472.68744000001}, "children": []}, {"entity_id": 10643052, "name": "2013 Irrev Tr HBO Thalia", "grouping": "legal_entity", "columns": {"time_weighted_return": 0, "time_weighted_return_2": 0, "_custom_twr_audit_note_911328": null, "value": 0.01}, "children": []}]}, {"name": "Asset Class D", "grouping": "_custom_level_2_624287", "columns": {"time_weighted_return": -0.06604362523792162, "time_weighted_return_2": -0.06604362523792162, "_custom_twr_audit_note_911328": null, "value": 5722529.229999997}, "children": [{"entity_id": 10868778, "name": "2012 Desc Tr HBO Thalia", "grouping": "legal_entity", "columns": {"time_weighted_return": -0.06154960593668424, "time_weighted_return_2": -0.06154960593668424, "_custom_twr_audit_note_911328": null, "value": 1191838.9399999995}, "children": []}, {"entity_id": 10643052, "name": "2013 Irrev Tr HBO Thalia", "grouping": "legal_entity", "columns": {"time_weighted_return": -0.06750460387418267, "time_weighted_return_2": -0.06750460387418267, "_custom_twr_audit_note_911328": null, "value": 4416618.520000002}, "children": []}, {"entity_id": 10598341, "name": "Cht 11th Tr HBO Shirley", "grouping": "legal_entity", "columns": {"time_weighted_return": -0.05604507809250081, "time_weighted_return_2": -0.05604507809250081, "_custom_twr_audit_note_911328": null, "value": 38190.33}, "children": []}, {"entity_id": 10598337, "name": "Cht 11th Tr HBO Hannah", "grouping": "legal_entity", "columns": {"time_weighted_return": -0.05604507809250081, "time_weighted_return_2": -0.05604507809250081, "_custom_twr_audit_note_911328": null, "value": 37940.72}, "children": []}, {"entity_id": 10598334, "name": "Cht 11th Tr HBO Lau", "grouping": "legal_entity", "columns": {"time_weighted_return": -0.05604507809250081, "time_weighted_return_2": -0.05604507809250081, "_custom_twr_audit_note_911328": null, "value": 37940.72}, "children": []}]}, {"name": "Asset Class E", "grouping": "_custom_level_2_624287", "columns": {"time_weighted_return": -0.017118805423322003, "time_weighted_return_2": -0.017118805423322003, "_custom_twr_audit_note_911328": null, "value": 3148495.0914600003}, "children": [{"entity_id": 10868778, "name": "2012 Desc Tr HBO Thalia", "grouping": "legal_entity", "columns": {"time_weighted_return": -0.015251157805867277, "time_weighted_return_2": -0.015251157805867277, "_custom_twr_audit_note_911328": null, "value": 800493.06146}, "children": []}, {"entity_id": 10643052, "name": "2013 Irrev Tr HBO Thalia", "grouping": "legal_entity", "columns": {"time_weighted_return": -0.01739609576880241, "time_weighted_return_2": -0.01739609576880241, "_custom_twr_audit_note_911328": null, "value": 2215511.2700000005}, "children": []}, {"entity_id": 10598341, "name": "Cht 11th Tr HBO Shirley", "grouping": "legal_entity", "columns": {"time_weighted_return": -0.02085132265594647, "time_weighted_return_2": -0.02085132265594647, "_custom_twr_audit_note_911328": null, "value": 44031.21}, "children": []}, {"entity_id": 10598337, "name": "Cht 11th Tr HBO Hannah", "grouping": "legal_entity", "columns": {"time_weighted_return": -0.02089393244695803, "time_weighted_return_2": -0.02089393244695803, "_custom_twr_audit_note_911328": null, "value": 44394.159999999996}, "children": []}, {"entity_id": 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