5

我希望对某些字典执行静态类型检查（ pylancein ）。vscode“棘手”部分是我希望某些参数是可选的，并且根本不显示在字典中。我试过使用dataclasses，TypedDict但到目前为止没有运气。

from typing import Optional, List
from dataclasses import dataclass, asdict


@dataclass
class SubOrder:
    name: str


@dataclass
class Order:
    name: str
    sub_orders: Optional[List[SubOrder]]


assert asdict(Order(name="Pizza")) == {"name": "Pizza"}
assert asdict(Order(name="Pizza", sub_orders=[SubOrder(name="Pasta")])) == {
    "name": "Pizza",
    "sub_orders": [{"name": "Pasta"}],
}

这可以实现dataclasses吗？我基本上只希望我的静态类型检查器 ( pylance/ pyright) 来检查我的字典，这就是我使用dataclasses. 我也尝试过，TypedDict但类型检查器的行为似乎不像我。他们总是要求我设置sub_orders。

以下代码通过但pylance不满意没有sub_orders.

from typing import Optional, List, TypedDict


class SubOrder(TypedDict):
    name: str


class Order(TypedDict):
    name: str
    sub_orders: Optional[List[SubOrder]]


assert Order(name="Pizza") == {"name": "Pizza"}
assert Order(name="Pizza", sub_orders=[SubOrder(name="Pasta")]) == {
    "name": "Pizza",
    "sub_orders": [{"name": "Pasta"}],
}

编辑

我已经添加了一个错误报告，pylance因为这实际上可能是pylance/pyright

4

2 回答 2

2 
from dataclasses import asdict, dataclass
from typing import List, Optional

from validated_dc import ValidatedDC


@dataclass
class SubOrder(ValidatedDC):
    name: str


@dataclass
class Order(ValidatedDC):
    name: str
    sub_orders: Optional[List[SubOrder]] = None

    def as_dict(self):
        data = asdict(self)
        return {key: value for key, value in data.items() if value is not None}


data = {'name': 'pizza'}
order = Order(**data)
assert order.get_errors() is None
assert asdict(order) == {'name': 'pizza', 'sub_orders': None}
assert order.as_dict() == {'name': 'pizza'}

data = {'name': 'pizza', 'sub_orders': [{'name': 'pasta'}]}
order = Order(**data)
assert order.get_errors() is None
assert asdict(order) == {'name': 'pizza', 'sub_orders': [{'name': 'pasta'}]}
assert isinstance(order.sub_orders[0], SubOrder)

ValidatedDC - https://github.com/EvgeniyBurdin/validated_dc

于 2020-07-10T05:11:22.060 回答
1

您可以通过将数据类中的可选参数设置为空字符串，例如：

from dataclasses import dataclass
@dataclass
class SubOrder:
    name: str=""
于 2021-12-10T10:55:38.540 回答