STY: Some more small linter and style fixes.

src/caosadvancedtools/models/data_model.py

@@ -27,7 +27,7 @@ from copy import deepcopy
 # actually
 # [deprecated](https://docs.python.org/3/library/typing.html#typing.List), so
 # remove this, when we drop support for old Python versions.
-from typing import List
+from typing import List, Optional
 
 import linkahead as db
 import linkahead.common.models as models
@@ -267,7 +267,8 @@ class DataModel(dict):
 
         return list(all_ents.values())
 
-    def get_deep(self, name: str, visited_props: dict = None, visited_parents: set = None):
+    def get_deep(self, name: str, visited_props: Optional[dict] = None,
+                 visited_parents: Optional[set] = None):
         """Attempt to resolve references for the given ``name``.
 
         The returned entity has all the properties it inherits from its ancestry and all properties

unittests/test_json_schema_model_parser.py

@@ -357,8 +357,8 @@ def test_name_property():
         broken = parse_model_from_json_schema(os.path.join(
             FILEPATH, "datamodel_name_wrong_type.schema.json"))
     assert str(err.value).startswith(
-        "The 'name' property must be string-typed, otherwise it cannot be identified with LinkAhead's "
-        "name property.")
+        "The 'name' property must be string-typed, otherwise it cannot be identified with "
+        "LinkAhead's name property.")
 
 
 def test_no_toplevel_entity():