lenskit.data.ItemListCollector

class lenskit.data.ItemListCollector

Bases: Protocol

Collect item lists with associated keys, as in ItemListCollection.

abstractmethod add(list, *fields, **kwfields)

Add a single item list to this list.

Parameters:

• list (lenskit.data._items.ItemList) – The item list to add.

• fields (lenskit.data.types.ID) – The key fields for this list.

• kwfields (lenskit.data.types.ID) – The key fields for this list.

abstractmethod add_from(other, **fields)

Add all collection from another collection to this collection. If field values are supplied, they are used to supplement or overwrite the keys in other; a common use case is to add results from multiple recommendation runs and save them a single field.

Parameters:

• other (ItemListCollection) – The item list collection to incorporate into this one.

• fields (lenskit.data.types.ID) – Additional key fields (must be specified by name).