jina.drivers.querylang.queryset.dunderkey¶

Originally from https://github.com/naiquevin/lookupy

The library is provided as-is under the MIT License

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jina.drivers.querylang.queryset.dunderkey.dunderkey(*args)[source]¶

Produces a nested key from multiple args separated by double underscore

>>> dunderkey('a', 'b', 'c')
>>> 'a__b__c'

:param *args : *String :rtype : String

Return type: str

jina.drivers.querylang.queryset.dunderkey.dunder_partition(key)[source]¶

Splits a dunderkey into 2 parts

The first part is everything before the final double underscore The second part is after the final double underscore

>>> dunder_partition('a__b__c')
>>> ('a__b', 'c')

:param neskey : String :rtype : 2 Tuple

Return type: Tuple[str, Optional[str]]

jina.drivers.querylang.queryset.dunderkey.dunder_init(key)[source]¶

Returns the initial part of the dunder key

>>> dunder_init('a__b__c')
>>> 'a__b'

:param neskey : String :rtype : String

Return type: str

jina.drivers.querylang.queryset.dunderkey.dunder_last(key)[source]¶

Returns the last part of the dunder key

>>> dunder_last('a__b__c')
>>> 'c'

:param neskey : String :rtype : Optional String

Return type: Optional[str]

jina.drivers.querylang.queryset.dunderkey.dunder_get(_dict, key)[source]¶

Returns value for a specified dunderkey

A “dunderkey” is just a fieldname that may or may not contain double underscores (dunderscores!) for referencing nested keys in a dict. eg:

>>> data = {'a': {'b': 1}}
>>> dunder_get(data, 'a__b')
1

key ‘b’ can be referrenced as ‘a__b’

:param _dict : (dict, list, struct or object) which we want to index into :param key : (str) that represents a first level or nested key in the dict :rtype : (mixed) value corresponding to the key

Return type: Any

jina.drivers.querylang.queryset.dunderkey.undunder_keys(_dict)[source]¶

Returns dict with the dunder keys converted back to nested dicts

eg:

>>> undunder_keys({'a': 'hello', 'b__c': 'world'})
{'a': 'hello', 'b': {'c': 'world'}}

:param _dict : (dict) flat dict :rtype : (dict) nested dict

Return type: Dict

jina.drivers.querylang.queryset.dunderkey.dunder_truncate(_dict)[source]¶

Returns dict with dunder keys truncated to only the last part

In other words, replaces the dunder keys with just last part of it. In case many identical last parts are encountered, they are not truncated further

eg:

>>> dunder_truncate({'a__p': 3, 'b__c': 'no'})
{'c': 'no', 'p': 3}
>>> dunder_truncate({'a__p': 'yay', 'b__p': 'no', 'c__z': 'dunno'})
{'a__p': 'yay', 'b__p': 'no', 'z': 'dunno'}

:param _dict : (dict) to flatten :rtype : (dict) flattened result

Return type: Dict