human
Solve the following python programming problem given the following code:
def __new__(mcs, name, bases, attributes) : 
    try : 
        constructor = constructor ['__new__'] 
except KeyError : 
        return type.__new__ (mcs, name, bases, attributes) 
def preparing_constructor(mcs, name, bases, attributes) : 
        try : 
            mcs.__prepare__ 
except AttributeError : 
            return constructor (mcs, name, bases, attributes) 
namespace = mcs.__prepare__ (name, bases) 
        defining_frame = sys._getframe (1) 
        for constant in reversed (defining_frame.f_code.co_consts) : 
            if (inspect.iscode (constant) and (constant.co_name == name)) : 
                def get_index(attribute_name, _names = constant.co_names) : 
                    try : 
                        return _names.index (attribute_name) 
except ValueError : 
                        return 0 
break 
else : 
            return constructor (mcs, name, bases, attributes) 
by_appearance = sorted (attributes.items (), key = (lambda item : get_index (item [0]))) 
        for (key, value) in by_appearance : 
            namespace [key] = value 
return constructor (mcs, name, bases, namespace) 
attributes ['__new__'] = functools.wraps (constructor) (preparing_constructor) 
    return type.__new__ (mcs, name, bases, attributes) 

    
    

    Fix the buggy line: constructor = constructor ['__new__']
assistant
#Here is Python code to fix the buggy line: constructor = constructor ['__new__']
.

constructor = attributes ['__new__']