style: 代码格式化

src/heurams/kernel/particles/nucleon.py

@@ -29,12 +29,13 @@ class Nucleon:
 
     def __hash__(self):
         return hash(self.ident)
-    
+
     def do_eval(self):
         """
         执行并以结果替换当前单元的所有 eval 语句
         TODO: 带有限制的 eval, 异步/多线程执行避免堵塞
         """
+
         # eval 环境设置
         def eval_with_env(s: str):
             try:
@@ -43,7 +44,7 @@ class Nucleon:
             except Exception as e:
                 ret = f"此 eval 实例发生错误: {e}"
             return ret
-            
+
         def traverse(data, modifier):
             if isinstance(data, dict):
                 for key, value in data.items():
@@ -60,9 +61,10 @@ class Nucleon:
                     if data.startswith("eval:"):
                         return modifier(data[5:])
                 return data
-        
+
         traverse(self.payload, eval_with_env)
         traverse(self.metadata, eval_with_env)
+
     @staticmethod
     def placeholder():
         """生成一个占位原子核"""