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collections.py

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+from .artifact import Artifact
+
+from abc import abstractmethod
+
+from dataclasses import field
+import random
+
+
+class Collection(Artifact):
+    @abstractmethod
+    def __getitem__(self, key):
+        pass
+
+
+class ListCollection(Collection):
+    items: list = field(default_factory=list)
+
+    def __getitem__(self, index):
+        return self.items[index]
+
+
+class DictCollection(Collection):
+    items: dict = field(default_factory=dict)
+
+    def __getitem__(self, key):
+        return self.items[key]
+
+
+class ItemPicker(Artifact):
+    item: object = None
+
+    def __call__(self, collection: Collection):
+        return collection[self.item]
+
+
+class RandomPicker(Artifact):
+    def __call__(self, collection: Collection):
+        if isinstance(collection, ListCollection):
+            return random.choice(list(collection.items))
+        elif isinstance(collection, DictCollection):
+            return random.choice(list(collection.items.values()))