<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def best_split(self, ind, dep):
 """ determine which splitting function to apply """

        if isinstance(dep, ContinuousColumn):
            return self.best_con_split(ind, dep)
        else:
            return self.best_cat_heuristic_split(ind, dep)