refactor: Convert non-percent formatted strings to f-strings

find . -name '*.py' -exec pyupgrade --keep-percent-format --py39-plus {} +

Author: chrisburr

src/WebAppDIRAC/Lib/WebHandler.py

@@ -116,7 +116,7 @@ def defaultEncoder(data):
         return data.strftime(DATETIME_DEFAULT_FORMAT)
     if isinstance(data, (set)):
         return list(data)
-    raise TypeError("Object of type {} is not JSON serializable".format(data.__class__.__name__))
+    raise TypeError(f"Object of type {data.__class__.__name__} is not JSON serializable")
 
 
 class WebHandler(TornadoREST):