betty.attrs.default_collection module

Collection attributes with default values.

final class betty.attrs.default_collection.DefaultCollectionAttr

Bases: ProxyAttr, OwnerAttr, Generic

A collection attribute with a default value.

__init__(proxied: CollectionAttrAttr[OwnerT, MutableCollectionT, ValuesSetT], default: Callable[[], ValuesSetT] | Callable[[OwnerT], ValuesSetT], /)

init_owner(owner: OwnerT, /) → None

Initialize the property on an owner.