<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_ga_event_category(self):
 """ Event category, defaults to form class name """

        return self.ga_event_category or '%s.%s' % (self.__class__.__module__, self.__class__.__name__)