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import typing
import marshmallow
class Sequence(marshmallow.fields.List):
"""
A sequence field, basically an immutable version of the list field.
"""
def _deserialize( # type: ignore[override]
self,
value: typing.Any,
attr: typing.Any,
data: typing.Any,
**kwargs: typing.Any,
) -> typing.Optional[typing.Sequence[typing.Any]]:
optional_list = super()._deserialize(value, attr, data, **kwargs)
return None if optional_list is None else tuple(optional_list)
class Set(marshmallow.fields.List):
"""
A set field. A set is an unordered/mutable collection of unique elements, same for frozenset
except it's immutable.
Notes:
Beware the a Set guarantees uniqueness in the resulting list but in return the item's order
will be random. So if the order matters, use a List or Sequence !
"""
def __init__(
self,
cls_or_instance: typing.Union[marshmallow.fields.Field, type],
frozen: bool = False,
**kwargs,
):
super().__init__(cls_or_instance, **kwargs)
self.set_type: typing.Type[typing.Union[frozenset, set]] = (
frozenset if frozen else set
)
def _deserialize( # type: ignore[override]
self,
value: typing.Any,
attr: typing.Any,
data: typing.Any,
**kwargs: typing.Any,
) -> typing.Union[typing.Set[typing.Any], typing.FrozenSet[typing.Any], None]:
optional_list = super()._deserialize(value, attr, data, **kwargs)
return None if optional_list is None else self.set_type(optional_list)
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