jsonextended 0.1.3.4

Extending the python json package functionality

Project: https://github.com/chrisjsewell/jsonextended

A module to extend the python json package functionality:

• decoding/encoding between the on-disk JSON structure and in-memory nested dictionary structure, including:

  • treating path structures, with nested directories and multiple .json files, as a single json.

  • on-disk indexing of the json structure (using the ijson package)

  • extended data type serialisation (numpy.ndarray, Decimals, pint.Quantities,…)

• viewing and manipulating the nested dictionaries:

  • enhanced pretty printer

  • Javascript rendered, expandable tree in the Jupyter Notebook

  • filter, merge, flatten, unflatten functions

• Units schema concept to apply and convert physical units (using the pint package)

• Parser abstract class for dealing with converting other file formats to JSON

Installation

pip install jsonextended

jsonextended has no import dependancies, on Python 3.x and only pathlib2 on 2.7 but, for full functionallity, it is advised to install the following packages:

conda install -c conda-forge ijson numpy pandas pint

Examples

For more information, all functions contain docstrings with tested examples.

Data Folders JSONisation

import jsonextended as ejson

path = ejson.get_test_path()
ejson.json_keys(path)

['dir1', 'dir2', 'dir3']

jdict1 = ejson.json_to_dict(path)
ejson.dict_pprint(jdict1,depth=2)

dir1:
  dir1_1: {...}
  file1: {...}
  file2: {...}
dir2:
  file1: {...}
dir3:

ejson.dict_to_html(jdict1,depth=3)

To try the rendered JSON tree, output in the Jupyter Notebook, go to : https://chrisjsewell.github.io/

Nested Dictionary Manipulation

jdict2 = ejson.json_to_dict(path,['dir1','file1'])
ejson.dict_pprint(jdict2,depth=1)

initial: {...}
meta: {...}
optimised: {...}
units: {...}

filtered = ejson.dict_filter_keys(jdict2,['vol*'],use_wildcards=True)
ejson.dict_pprint(filtered)

initial:
  crystallographic:
    volume: 924.62752781
  primitive:
    volume: 462.313764
optimised:
  crystallographic:
    volume: 1063.98960509
  primitive:
    volume: 531.994803

ejson.dict_pprint(ejson.dict_flatten(filtered))

('initial', 'crystallographic', 'volume'):   924.62752781
('initial', 'primitive', 'volume'):          462.313764
('optimised', 'crystallographic', 'volume'): 1063.98960509
('optimised', 'primitive', 'volume'):        531.994803

Units Schema

Unit schema builds on the concept of standard jsonschema, whereby one JSON can be used to validate another.

In this case one JSON, containing physical units for a given key path, is applied to a data JSON.

from jsonextended.units import apply_unitschema, split_quantities
withunits = apply_unitschema(filtered,{'volume':'angstrom^3'})
ejson.dict_pprint(withunits)

initial:
  crystallographic:
    volume: 924.62752781 Å ** 3
  primitive:
    volume: 462.313764 Å ** 3
optimised:
  crystallographic:
    volume: 1063.98960509 Å ** 3
  primitive:
    volume: 531.994803 Å ** 3

newunits = apply_unitschema(withunits,{'volume':'nm^3'})
ejson.dict_pprint(newunits)

initial:
  crystallographic:
    volume: 0.92462752781 nm ** 3
  primitive:
    volume: 0.462313764 nm ** 3
optimised:
  crystallographic:
    volume: 1.06398960509 nm ** 3
  primitive:
    volume: 0.531994803 nm ** 3

ejson.dict_pprint(split_quantities(newunits),depth=4)

initial:
  crystallographic:
    volume:
      magnitude: 0.92462752781
      units:     nanometer ** 3
  primitive:
    volume:
      magnitude: 0.462313764
      units:     nanometer ** 3
optimised:
  crystallographic:
    volume:
      magnitude: 1.06398960509
      units:     nanometer ** 3
  primitive:
    volume:
      magnitude: 0.531994803
      units:     nanometer ** 3