human
Solve the following python programming problem given the following code:
@ staticmethod 
def get_num_select_conjuncs(op) : 
    'Get the number of conjunctions within all select operations.' 
    def count(_op) : 
        if isinstance (_op, Select) : 
            (yield len (expression.extract_conjuncs (_op.condition))) 
else : 
            (yield 0) 
return sum (op.postorder (op)) 

    
    

    Fix the buggy line: return sum (op.postorder (op))
assistant
#Here is Python code to fix the buggy line: return sum (op.

return sum (op.postorder (def count())