extracts method to get default value of function keyword argument

src/pydase/utils/serializer.py

@@ -149,36 +149,29 @@ class Serializer:
         }
 
     @staticmethod
-    def _serialize_method(obj: Callable[..., Any]) -> dict[str, Any]:
+    def _get_default_value_of_method_arg(
-        obj_type = "method"
+        obj: Callable[..., Any], arg_name: str, arg_value: inspect.Parameter
-        value = None
+    ) -> Any:
-        readonly = True
+        default_value = arg_value.default
-        doc = get_attribute_doc(obj)
-
-        # Store parameters and their anotations in a dictionary
-        sig = inspect.signature(obj)
-        parameters: dict[str, dict[str, Any]] = {}
-
-        for k, v in sig.parameters.items():
-            default_value = v.default
         if default_value is None:
             raise KeywordArgumentError(
-                    f"Default value for keyword {k!r} of function {obj.__name__!r} "
+                f"Default value for keyword {arg_name!r} of function {obj.__name__!r} "
                 "cannot be 'None'."
             )
 
         if default_value is inspect.Parameter.empty:
-                annotation = v.annotation
+            annotation = arg_value.annotation
             if annotation is not inspect._empty:
                 if annotation is None:
                     raise KeywordArgumentError(
-                            f"Type hint of keyword {k!r} of function {obj.__name__!r} "
+                        f"Type hint of keyword {arg_name!r} of function "
-                            "cannot be 'None'."
+                        f"{obj.__name__!r} cannot be 'None'."
                     )
                 if issubclass(annotation, u.Quantity):
                     raise KeywordArgumentError(
-                            f"Keyword {k!r} of function {obj.__name__!r} needs default "
+                        f"Keyword {arg_name!r} of function {obj.__name__!r} needs "
-                            "argument. Quantity objects have no obvious default value."
+                        "default argument. Quantity objects have no obvious default "
+                        "value."
                     )
 
                 if annotation == str:
@@ -193,18 +186,34 @@ class Serializer:
                     default_value = next(iter(annotation))
                 else:
                     raise KeywordArgumentError(
-                            f"Type of keyword {k!r} of function {obj.__name__} should "
+                        f"Type of keyword {arg_name!r} of function {obj.__name__} "
-                            "be a simple type (str, int, float, bool, Enum, Quantity)."
+                        "should be a simple type (str, int, float, bool, Enum, Quantity"
+                        ")."
                     )
             else:
                 logger.warning(
                     "Keyword %a of function %a has no type hint. "
                     "Defaulting to float...",
-                        k,
+                    arg_name,
                     obj.__name__,
                 )
                 default_value = 0.0
+        return default_value
 
+    @staticmethod
+    def _serialize_method(obj: Callable[..., Any]) -> dict[str, Any]:
+        obj_type = "method"
+        value = None
+        readonly = True
+        doc = get_attribute_doc(obj)
+        frontend_render = render_in_frontend(obj)
+
+        # Store parameters and their anotations in a dictionary
+        sig = inspect.signature(obj)
+        parameters: dict[str, dict[str, Any]] = {}
+
+        for k, v in sig.parameters.items():
+            default_value = Serializer._get_default_value_of_method_arg(obj, k, v)
             parameters[k] = dump(default_value)
 
         return {
@@ -214,7 +223,7 @@ class Serializer:
             "doc": doc,
             "async": inspect.iscoroutinefunction(obj),
             "parameters": parameters,
-            "frontend_render": render_in_frontend(obj),
+            "frontend_render": frontend_render,
         }
 
     @staticmethod