human
Solve the following python programming problem given the following code:
def add_missing_elevations(self) : 
    def _add(interval, start, end, distances_ratios) : 
        assert start 
        assert end 
        assert (start.elevation is not None) 
        assert (end.elevation is not None) 
        assert interval 
        assert (len (interval) == len (distances_ratios)) 
        for i in range (len (interval)) : 
            interval [i].elevation = (start.elevation + (distances_ratios [i] * (end.elevation - start.elevation))) 
self.add_missing_data (get_data_function = (lambda point : point.elevation), add_missing_function = self) 

    
    

    Fix the buggy line: self.add_missing_data (get_data_function = (lambda point : point.elevation), add_missing_function = self)
assistant
#Here is Python program to fix the buggy line: self.

self.add_missing_data (get_data_function = (lambda point : point.elevation), add_missing_function = def _add()