refactor: avoid using temp files in sandbox.

Author: liqiang-fit2cloud

apps/common/utils/tool_code.py

@@ -87,11 +87,9 @@ def exec_code(self, code_str, keywords):
     for local in locals_v:
         globals_v[local] = locals_v[local]
     exec_result=f(**keywords)
-    builtins.print("-\n-\n-")
-    builtins.print("{_id}:" + base64.b64encode(json.dumps({success}, default=str).encode()).decode())
+    builtins.print("\\n{_id}:"+base64.b64encode(json.dumps({success}, default=str).encode()).decode())
 except Exception as e:
-    builtins.print("-\n-\n-")
-    builtins.print("{_id}:" + base64.b64encode(json.dumps({err}, default=str).encode()).decode())
+    builtins.print("\\n{_id}:"+base64.b64encode(json.dumps({err}, default=str).encode()).decode())
 """
         if self.sandbox:
             subprocess_result = self._exec_sandbox(_exec_code)