Use pyupgrade with --py36-plus param.

gns3server/controller/drawing.py

@@ -96,7 +96,7 @@ class Drawing:
         try:
             root = ET.fromstring(value)
         except ET.ParseError as e:
-            log.error("Can't parse SVG: {}".format(e))
+            log.error(f"Can't parse SVG: {e}")
             return
         # SVG is the default namespace no need to prefix it
         ET.register_namespace('xmlns', "http://www.w3.org/2000/svg")
@@ -222,4 +222,4 @@ class Drawing:
         }
 
     def __repr__(self):
-        return "<gns3server.controller.Drawing {}>".format(self._id)
+        return f"<gns3server.controller.Drawing {self._id}>"