Replace ExceptionGroup with new ProjectPutError

pyproject.toml

@@ -25,7 +25,6 @@ dependencies = [
   "skops",
   "uvicorn",
 ]
-requires-python = ">= 3.11"
 
 [project.optional-dependencies]
 test = [

src/skore/project.py

@@ -21,6 +21,10 @@
 logger = logging.getLogger(__name__)
 
 
+class ProjectPutError(Exception):
+    """One more key-value pairs could not be saved in the Project."""
+
+
 class Project:
     """A project is a collection of items that are stored in a storage."""
 
@@ -94,8 +98,9 @@ def put_several(
 
         if errors:
             if on_error == "raise":
-                raise ExceptionGroup(
-                    "Several items could not be inserted in the Project", errors
+                raise ProjectPutError(
+                    "Several items could not be inserted in the Project "
+                    f"due to the following errors: {errors}"
                 )
 
             logger.warning(

tests/unit/test_project.py

@@ -14,7 +14,7 @@
 from skore.layout import LayoutRepository
 from skore.layout.layout import LayoutItem, LayoutItemSize
 from skore.persistence.in_memory_storage import InMemoryStorage
-from skore.project import Project, ProjectLoadError, load
+from skore.project import Project, ProjectLoadError, ProjectPutError, load
 
 
 @pytest.fixture
@@ -215,5 +215,5 @@ def test_put_key_is_a_set(project):
 
 def test_put_wrong_key_and_value_raise(project):
     """When `on_error` is "raise", raise."""
-    with pytest.raises(ExceptionGroup):
+    with pytest.raises(ProjectPutError):
         project.put(0, (lambda: "unsupported object"), on_error="raise")