小编hch*_*chw的帖子

我的问题如下：我想创建一个继承自typing.NamedTuple的类和另一个抽象类中的mixin。理想情况下我想做这样的事情：

from typing import *
from abc import ABC, abstractmethod

class M(ABC):
    @abstractmethod
    def m(self, it: Iterable[str]) -> str:
        pass

class N(NamedTuple, M):
    attr1: str

    def m(self, it):
        return self.attr1 + it

当我现在尝试这样做时，我收到此错误：

TypeError: metaclass conflict: the metaclass of a derived class must be a (non-strict) subclass of the metaclasses of all its bases

我知道我可以这样做：

from typing import *
from abc import ABC, abstractmethod

class M(ABC):
    @abstractmethod
    def m(self, it: Iterable[str]) -> str:
        pass

class NT(NamedTuple):
    attr1: str

class N(NT, …

这是我正在使用的代码

import funcy

@funcy.memoize
class mystery(object):

    def __init__(self, num):
        self.num = num

feat = mystery(1)

with open('num.pickle', 'wb') as f:
    pickle.dump(feat,f)

这给了我以下错误:

PicklingError: Can't pickle <class '__main__.mystery'>: it's not the 
same object as __main__.mystery

我希望1)理解为什么会这样,2)找到一个允许我挑选对象的解决方案(不删除memoization).理想情况下,解决方案不会改变对pickle的调用.

用funcy运行python 3.6 == 1.10

提前致谢!