python 3 updates

- Fix super() calls for python 3
- No need to inherit objects.
- No need for u at the start of strings
- Tidied up some brackets and f-strings too

tools/copyright_updater.py

@@ -82,7 +82,7 @@ def help():
     print("\nInvalid command line options. Usage:")
     print("\t{0} <year to find> <year to replace>".format(sys.argv[0]))
     print("\tExample: {0} 2018 2019\n".format(sys.argv[0]))
-    exit(1)
+    sys.exit(1)
 
 
 if __name__ == '__main__':