add

ccxt/static_dependencies/marshmallow_dataclass/collection_field.py

@@ -0,0 +1,51 @@
+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)