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Nest a sequence of records

Project description

Nestable nests a sequence of records: that is, Nestable groups a sequence of records into a nested dict.

Nestable is a partial implementation of D3’s Nest operator.

>>> from nestable import nest
>>> records = [
...     {'country': 'Algeria', 'region': 'Africa'},
...     {'country': 'Benin', 'region': 'Africa'},
...     {'country': 'Albania', 'region': 'EEG'},
... ]
>>> accessor = lambda x: (x.get('region'), x.get('country'))
>>> obs = nest(records, accessor)
>>> exp = {'EEG': {'Albania': [{'country': 'Albania', 'region': 'EEG'}]},
...        'Africa': {'Algeria': [{'country': 'Algeria', 'region': 'Africa'}],
...                   'Benin': [{'country': 'Benin', 'region': 'Africa'}]}}
>>> obs == exp

Like D3’s Nest operator, Nestable allows you to supply a rollup function that is applied to each sequence of leaf elements. The return value of this function will replace each sequence of leaf elements in the nested dict.

>>> obs = nest(records, accessor, rollup=len)
>>> exp = {'EEG': {'Albania': 1}, 'Africa': {'Algeria': 1, 'Benin': 1}}
>>> obs == exp

Unlike D3’s Nest operator, however, Nestable doesn’t support sorted keys or sorted values.


Activate a new virtual environment and install nestable in development mode with its development dependencies:

pip install -e . -r requirements.txt

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