def __normalize(self):
<EOL>if self.__normalizing is True or self.__initialized is False:<EOL><INDENT>return<EOL><DEDENT>self.__normalizing = True<EOL>self.__normalize_grades()<EOL>self.__normalize_progress()<EOL>self.__normalizing = False<EOL>
Adjusts the values of the filters to be correct.
For example, if you set grade 'B' to True, then 'All'
should be set to False