Reviewed scan python code

files/gvm_library.py

@@ -53,7 +53,7 @@ class PortList:
         return pretty_json(d)
     
     def __del__(self):
-        print("i'm going to delete port list: {self}")
+        print(f"i'm going to delete port list: {self}")
         self.delete()
         print("i finished to delete port list")