如何通过 python 3.5 输入模块输入提示 collections.OrderedDict [英] how to type hint collections.OrderedDict via python 3.5 typing module

问题描述

我想使用 OrderedDict，其中键是 Enum，项目是某个类.

I want to use an OrderedDict where the key is a Enum and where the item is a certain class.

我如何使用打字模块来提示这一点?这个暗示的namedtuple的类比是什么::

How do I use the typing module to hint this? What is the analog to this hinted namedtuple::

Move = typing.NamedTuple('Move', [('actor', Actor), ('location', Location)])

推荐答案

如 AChampion 的评论中所述，您可以使用 MutableMapping:

As noted in a comment by AChampion, you can use MutableMapping:

class Actor(Enum):
    # ...Actor enum menbers...

class Location:
    # ...Location class body...

class MapActor2Location(OrderedDict, MutableMapping[Actor, Location]):
    pass

<小时>

针对像我这样以前没有使用过 typing 模块的人的附录:注意类型定义使用索引语法 ([T]) without 括号.我最初尝试过这样的事情:

---

Addendum for people like me who haven't used the typing module before: note that the type definitions use indexing syntax ([T]) without parentheses. I initially tried something like this:

class MyMap(OrderedDict, MutableMapping([KT, VT])): pass

(注意[KT, VT]周围的括号！)

这给出了我认为相当令人困惑的错误:

This gives what I consider a rather confusing error:

TypeError: Can't instantiate abstract class MutableMapping with abstract methods __delitem__, __getitem__, __iter__, __len__, __setitem__

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