use constant

Author: Attsun1031

data_diff/config.py

@@ -4,6 +4,12 @@
 import toml
 
 
+_ARRAY_FIELDS = (
+    "key_columns",
+    "columns",
+)
+
+
 class ConfigParseError(Exception):
     pass
 
@@ -39,7 +45,7 @@ def _apply_config(config: Dict[str, Any], run_name: str, kw: Dict[str, Any]):
             run_args[index] = {attr: kw.pop(f"{attr}{index}") for attr in ("database", "table")}
 
     # Make sure array fields are decoded as list, since array fields in toml are decoded as list, but TableSegment object requires tuple type.
-    for field in ["key_columns", "columns"]:
+    for field in _ARRAY_FIELDS:
         if isinstance(run_args.get(field), list):
             run_args[field] = tuple(run_args[field])