refactor: use explicit conversion in f-strings

gns3server/utils/images.py

@@ -114,7 +114,7 @@ async def list_images(image_type):
                         }
                     )
                 except OSError as e:
-                    log.warning(f"Can't add image {path}: {str(e)}")
+                    log.warning(f"Can't add image {path}: {e!s}")
     return images
 
 

gns3server/utils/packet_filter_validation.py

@@ -62,7 +62,7 @@ def validate_bpf_syntax(bpf_expression: str) -> Dict[str, Any]:
 
     except Exception as e:
         log.error("Unexpected error during BPF validation: %s", e)
-        return {"valid": False, "error": f"BPF validation error: {str(e)}"}
+        return {"valid": False, "error": f"BPF validation error: {e!s}"}
 
 
 def validate_filter_parameters(filter_type: str, values: List[Any]) -> None: