from data_reducer import DataReducer

>>> origin_data = {
    'id': '1',
    'avatar': {
        'creator': {
            'birthday': {'day': 22, 'month': 1, 'year': 1993},
            'email': 'example@gmail.com',
            'id': '1',
            'name': 'example'
        },
        'deleted': False,
        'id': '1',
        'path': 'abc',
        'types': ['a', 'b', 'c'],
        'url': 'url'
    },
    'translations': [
        {'content': '1', 'id': '1', 'locale': 'vi', 'name': 'A'},
        {'content': '2', 'id': '2', 'locale': 'en', 'name': 'B'}
    ]
}

# define fields those you want to keep,
# use "." to separate nested objects
>>> only_fields = [
    'id',
    'translations.id',
    'translations.locale',
    'translations.name',
    'translations.types',
    'avatar.url',
    'avatar.id',
    'avatar.creator.id',
    'avatar.creator.birthday.year',
]

>>> DataReducer(data=origin_data, include_fields=only_fields).run()
# your beautiful result
{
    'id': '1',
    'translations': [
        {'id': '1', 'locale': 'vi', 'name': 'A'},
        {'id': '2', 'locale': 'en', 'name': 'B'}
    ],
    'avatar': {
        'url': 'url',
        'id': '1',
        'creator': {
            'id': '1',
            'birthday': {'year': 1993}
        }
    }
}