[英]mypy - Item "None" of "Optional[CustomAttrsModel]" has no attribute "country"
When I run mypy checkings I am getting an error.当我运行 mypy 检查时,出现错误。 I am no able to ignore it or turn it off the strict optional checking.
我无法忽略它或将其关闭严格的可选检查。 It there a way to solve this.
它有办法解决这个问题。
Here is the line that is throwing the error:这是引发错误的行:
if tree.data.attributes.custom != JAPAN:
where attributes
is declared as:其中
attributes
声明为:
class TreeAttributesModel(BaseModel):
id: Optional[TreeId]
name: Optional[str] = None
status: StatusEnum
custom: Optional[CustomAttrsModel] = None
and CustomAttrsModel
is declared as it follows:并且
CustomAttrsModel
声明如下:
class CustomAttrsModel(BaseModel):
seller: Optional[str]
buyed_at: Optional[datetime]
country: Optional[Union[CountryEnum, str]]
Could you please help me with this?你能帮我解决这个问题吗?
I had to tweak your snippets a bit to get a MWE, but here we go :我不得不稍微调整一下你的片段以获得 MWE,但我们开始吧:
import enum
import dataclasses
from datetime import datetime
from typing import Optional, Union
class StatusEnum(enum.Enum):
OK = enum.auto()
NOK = enum.auto()
class CountryEnum(enum.Enum):
JAPAN = enum.auto()
RAPTURE = enum.auto()
@dataclasses.dataclass
class TreeAttributesModel:
id: Optional[str]
name: Optional[str] # = None had to remove default, attribs w/o default cannot follow attribs w/ one
status: StatusEnum
custom: Optional[CustomAttrsModel] = None
@dataclasses.dataclass
class CustomAttrsModel:
seller: Optional[str]
buyed_at: Optional[datetime]
country: Optional[Union[CountryEnum, str]]
custom = CustomAttrsModel(seller="test", buyed_at=None, country=CountryEnum.JAPAN)
attribs = TreeAttributesModel(id="test", name="test", status=StatusEnum.OK, custom=custom)
assert attribs.custom is not None # this is typed as being optional, so make sure it isn't None
assert attribs.custom.country is not None # same as above
result = attribs.custom.country != CountryEnum.JAPAN
The message is: just use assert something is not None
whenever something
is Optional
;)消息是:只要
something
是Optional
的,就使用assert something is not None
;)
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