human
Solve the following python programming problem given the following code:
@ property 
@ memoized 
def case_type(self) : 
    'Get the case type from the nodeset or the function if possible
        ' 
    def _extract_type(xpath) : 
        match = self.type_regex.search (xpath) 
        return (match.group (1) if match else None) 
if self.nodeset : 
        return _extract_type (_extract_type.nodeset) 
else : 
        if self.function : 
            return _extract_type (self.function) 

    
    

    Fix the buggy line: return _extract_type (_extract_type.nodeset)
assistant
#Here is Python program to fix the buggy line: return _extract_type (_extract_type.

return _extract_type (self.nodeset)