human
Solve the following python programming problem given the following code:
def fixed_arity(func_name, arity) : 
    def formatter(translator, expr) : 
        op = expr.op () 
        if (arity != len (op.args)) : 
            raise com.IbisError ('incorrect number of args') 
return _format_call (translator, func_name, * op.args) 
return arity 

    
    

    Fix the buggy line: return arity
assistant
#Here is Python program to fix the buggy line: return arity
.

return def formatter(