design pattern quick reference builder form_builder py from abc import abcmetaabstractmethod class director(objectmetaclass=abcmeta)def __init__(self)self _builder none @abstractmethod def construct(self)pass def get_constructed_object(self)return self _builder constructed_object class builder(objectmetaclass=abcmeta)def __init__(selfconstructed_object)self constructed_object constructed_object class product(object)def __init__(self)pass def __repr__(self)pass class concretebuilder(builder)pass class concretedirector(director)pass