chore: refurbish Python code by applying refurb linter rules (#8296)

api/core/workflow/graph_engine/entities/graph.py

@@ -268,7 +268,7 @@ class Graph(BaseModel):
                     f"Node {graph_edge.source_node_id} is connected to the previous node, please check the graph."
                 )
 
-            new_route = route[:]
+            new_route = route.copy()
             new_route.append(graph_edge.target_node_id)
             cls._check_connected_to_previous_node(
                 route=new_route,
@@ -679,8 +679,7 @@ class Graph(BaseModel):
         all_routes_node_ids = set()
         parallel_start_node_ids: dict[str, list[str]] = {}
         for branch_node_id, node_ids in routes_node_ids.items():
-            for node_id in node_ids:
-                all_routes_node_ids.add(node_id)
+            all_routes_node_ids.update(node_ids)
 
             if branch_node_id in reverse_edge_mapping:
                 for graph_edge in reverse_edge_mapping[branch_node_id]:

api/core/workflow/nodes/code/code_node.py

@@ -74,7 +74,7 @@ class CodeNode(BaseNode):
         :return:
         """
         if not isinstance(value, str):
-            if isinstance(value, type(None)):
+            if value is None:
                 return None
             else:
                 raise ValueError(f"Output variable `{variable}` must be a string")
@@ -95,7 +95,7 @@ class CodeNode(BaseNode):
         :return:
         """
         if not isinstance(value, int | float):
-            if isinstance(value, type(None)):
+            if value is None:
                 return None
             else:
                 raise ValueError(f"Output variable `{variable}` must be a number")
@@ -182,7 +182,7 @@ class CodeNode(BaseNode):
                                 f"Output {prefix}.{output_name} is not a valid array."
                                 f" make sure all elements are of the same type."
                             )
-                elif isinstance(output_value, type(None)):
+                elif output_value is None:
                     pass
                 else:
                     raise ValueError(f"Output {prefix}.{output_name} is not a valid type.")
@@ -284,7 +284,7 @@ class CodeNode(BaseNode):
 
                     for i, value in enumerate(result[output_name]):
                         if not isinstance(value, dict):
-                            if isinstance(value, type(None)):
+                            if value is None:
                                 pass
                             else:
                                 raise ValueError(

api/core/workflow/nodes/if_else/if_else_node.py

@@ -79,7 +79,7 @@ class IfElseNode(BaseNode):
             status=WorkflowNodeExecutionStatus.SUCCEEDED,
             inputs=node_inputs,
             process_data=process_datas,
-            edge_source_handle=selected_case_id if selected_case_id else "false",  # Use case ID or 'default'
+            edge_source_handle=selected_case_id or "false",  # Use case ID or 'default'
             outputs=outputs,
         )
 

api/core/workflow/nodes/llm/llm_node.py

@@ -580,7 +580,7 @@ class LLMNode(BaseNode):
         prompt_messages = prompt_transform.get_prompt(
             prompt_template=node_data.prompt_template,
             inputs=inputs,
-            query=query if query else "",
+            query=query or "",
             files=files,
             context=context,
             memory_config=node_data.memory,

api/core/workflow/nodes/question_classifier/question_classifier_node.py

@@ -250,7 +250,7 @@ class QuestionClassifierNode(LLMNode):
         for class_ in classes:
             category = {"category_id": class_.id, "category_name": class_.name}
             categories.append(category)
-        instruction = node_data.instruction if node_data.instruction else ""
+        instruction = node_data.instruction or ""
         input_text = query
         memory_str = ""
         if memory: