35 lines
1.4 KiB
Plaintext
35 lines
1.4 KiB
Plaintext
multi_key_dict
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======================
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Implementation of a multi-key dictionary, i.e.:
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(key1[,key2, ..]) => value
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This dictionary has a similar interface to the standard dictionary => but is extended to support multiple keys referring to the same element.
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If element is created using multiple keys, e.g.:
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.. code:: python
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from multi_key_dict import multi_key_dict
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k = multi_key_dict()
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k[1000, 'kilo', 'k'] = 'kilo (x1000)'
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print k[1000] # will print 'kilo (x1000)'
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print k['k'] # will also print 'kilo (x1000)'
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# the same way objects can be updated, deleted:
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# and if an object is updated using one key, the new value will
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# be accessible using any other key, e.g. for example above:
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k['kilo'] = 'kilo'
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print k[1000] # will now print 'kilo' as value was updated
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These elements can be accessed using either of those keys (e.g for read/update/deletion).
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Multi-key dict provides also extended interface for iterating over items and keys (e.g. by the key type), which might be useful when creating, e.g. dictionaries with index-name key pair allowing to iterate over items using either: names or indexes.
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It can be useful for many many other similar use-cases, and there is no limit to the number of keys used to map to the value.
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There are few other useful methods, e.g. to iterate over dictionary (by/using) selected key type, finding other keys mapping to the same value etc. Refer to example/test code to see it in action.
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