Library to handle JSON-stat data in python using pandas DataFrames.
Project description
LAST RELEASE 2.0: update to 2.0 version is highly recommended, since it supports JSON-stat 2.0 and brings other improvements. Also, Version 2.X starts to support Pandas 1.X, and won’t have backwards compatibility. WARNING: support for Python 2.7 has been removed in pyjstat 2.0.
pyjstat
pyjstat is a python library for JSON-stat formatted data manipulation which allows reading and writing JSON-stat [1] format with python,using the DataFrame structures provided by the widely accepted pandas library [2]. The JSON-stat format is a simple lightweight JSON format for data dissemination, currently in its 2.0 version. Pyjstat is inspired in rjstat [3], a library to read and write JSON-stat with R, by ajschumacher. Note that, like in the rjstat project, not all features are supported (i.e. not all metadata are converted). pyjstat is provided under the Apache License 2.0.
This library was first developed to work with Python 2.7. With some fixes (thanks to @andrekittredge), now it works with Python 3.4 too.
Support for JSON-stat 1.3 and 2.0 is provided. JSON-stat 1.3 methods are deprecated now and shouldn’t be used in the future, but backwards compatibility has been preserved.
Pyjstat 1.0 is aimed for simplicity. JSON-stat classes have been replicated (Dataset, Collection and Dimension) and provided with simple read() and write() methods. Funcionality covers common use cases as having a URL or dataframe as data sources.
Methods for retrieving the value of a particular cube cell are taken from the JSON-stat Javascript sample code. Thanks to @badosa for this.
Also, version 1.0 makes use of the requests package internally, which should make downloading of datasets easier.
Test coverage is 88% and Travis CI is used.
Finally, note that the new classes and methods are inspired by JSON-stat 2.0, and hence, won’t work with previous versions of JSON-stat. However, older methods are still available incorporating bug fixes and performance improvements.
Installation
pyjstat requires pandas package. For installation:
pip install pyjstat
Usage of version 1.0 and newer (with JSON-stat 2.0 support)
Dataset operations: read and write
Typical usage often looks like this:
from pyjstat import pyjstat EXAMPLE_URL = 'http://json-stat.org/samples/galicia.json' # read from json-stat dataset = pyjstat.Dataset.read(EXAMPLE_URL) # write to dataframe df = dataset.write('dataframe') print(df) # read from dataframe dataset_from_df = pyjstat.Dataset.read(df) # write to json-stat print(dataset_from_df.write())
Dataset operation: get_value
This operation mimics the Javascript example in the JSON-stat web page:
from pyjstat import pyjstat EXAMPLE_URL = 'http://json-stat.org/samples/oecd.json' query = [{'concept': 'UNR'}, {'area': 'US'}, {'year': '2010'}] dataset = pyjstat.Dataset.read(EXAMPLE_URL) print(dataset.get_value(query))
Collection operations: read and write
A collection can be parsed into a list of dataframes:
from pyjstat import pyjstat EXAMPLE_URL = 'http://json-stat.org/samples/collection.json' collection = pyjstat.Collection.read(EXAMPLE_URL) df_list = collection.write('dataframe_list') print(df_list)
Example with UK ONS API
In the following example, apikey parameter must be replaced by a real api key from ONS. This dataset corresponds to residence type by sex by age in London:
EXAMPLE_URL = 'http://web.ons.gov.uk/ons/api/data/dataset/DC1104EW.json?'\ 'context=Census&jsontype=json-stat&apikey=yourapikey&'\ 'geog=2011HTWARDH&diff=&totals=false&'\ 'dm/2011HTWARDH=E12000007' dataset = pyjstat.Dataset.read(EXAMPLE_URL) df = dataset.write('dataframe') print(df)
More examples
More examples can be found in the examples directory, both for versions 1.3 and 2.0.
Usage of version 0.3.5 and older (with support for JSON-stat 1.3)
This syntax is deprecated and therefore not recommended anymore.
From JSON-stat to pandas DataFrame
Typical usage often looks like this:
from pyjstat import pyjstat import requests from collections import OrderedDict EXAMPLE_URL = 'http://json-stat.org/samples/us-labor.json' data = requests.get(EXAMPLE_URL) results = pyjstat.from_json_stat(data.json(object_pairs_hook=OrderedDict)) print (results)
From pandas DataFrame to JSON-stat
The same data can be converted into JSON-stat, with some unavoidable metadata loss:
from pyjstat import pyjstat import requests from collections import OrderedDict import json EXAMPLE_URL = 'http://json-stat.org/samples/us-labor.json' data = requests.get(EXAMPLE_URL) results = pyjstat.from_json_stat(data.json(object_pairs_hook=OrderedDict)) print (results) print (json.dumps(json.loads(pyjstat.to_json_stat(results))))
Changes
For a changes, fixes, improvements and new features reference, see CHANGES.txt.
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