Deduplicate blackening (#81802)

script/hassfest/config_flow.py

@@ -4,20 +4,9 @@ from __future__ import annotations
 import json
 import pathlib
 
-import black
-
 from .brand import validate as validate_brands
 from .model import Brand, Config, Integration
-from .serializer import to_string
-
-BASE = """
-\"\"\"Automatically generated by hassfest.
-
-To update, run python3 -m script.hassfest
-\"\"\"
-
-FLOWS = {}
-""".strip()
+from .serializer import format_python_namespace
 
 UNIQUE_ID_IGNORE = {"huawei_lte", "mqtt", "adguard"}
 
@@ -91,7 +80,7 @@ def _generate_and_validate(integrations: dict[str, Integration], config: Config)
         else:
             domains["integration"].append(domain)
 
-    return black.format_str(BASE.format(to_string(domains)), mode=black.Mode())
+    return format_python_namespace({"FLOWS": domains})
 
 
 def _populate_brand_integrations(