英文:
Multiprocessing and event, type hint issue python
问题
我使用了multiprocessing模块来执行后台任务。
# module_a.py
from multiprocessing import Event
from multiprocessing import Process
class BackgroundWorker(Process):
"""创建一个后台工作进程。"""
def __init__(
self,
name: str,
daemon: bool,
contents: Any,
event: Event,
) -> None:
"""初始化默认值。"""
self.contents: Any = contents
self._event: Event = event
super().__init__(name=name, daemon=daemon)
def run(self) -> None:
"""运行目标函数。"""
一些代码
if self._event.wait(0.4):
一些代码
if self._event.is_set():
break
一些代码
# module_b.py
from multiprocessing import Event
event: Event = Event()
def cancel_task():
event.set()
在运行mypy时出现以下错误：
error: 变量 "multiprocessing.Event" 无效作为类型 [valid-type]
note: 请参考 https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
error: 变量 "multiprocessing.Event" 无效作为类型 [valid-type]
note: 请参考 https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
error: Event? 没有属性 "is_set" [attr-defined]
error: Event? 没有属性 "wait" [attr-defined]
请提出建议。
英文:
I have used multiprocessing module to perform a background task.
# module_a.py
from multiprocessing import Event
from multiprocessing import Process
class BackgroundWorker(Process):
"""Create a worker background process."""
def __init__(
self,
name: str,
daemon: bool,
contents: Any,
event: Event,
) -> None:
"""Initialize the defaults."""
self.contents: Any = contents
self._event: Event = event
super().__init__(name=name, daemon=daemon)
def run(self) -> None:
"""Run the target function."""
some code
if self._event.wait(0.4):
some code
if self._event.is_set():
break
some code
# module_b.py
from multiprocessing import Event
event: Event = Event()
def cancel_task():
event.set()
Following are the errors on running mypy
error: Variable "multiprocessing.Event" is not valid as a type [valid-type]
note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
error: Variable "multiprocessing.Event" is not valid as a type [valid-type]
note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
error: Event? has no attribute "is_set" [attr-defined]
error: Event? has no attribute "wait" [attr-defined]
Please suggest.
答案1
得分: 1
根据 @Aaron 的建议，以下是新的更改：
# module_a.py
from multiprocessing.synchronize import Event as EventClass
将 Event 替换为 EventClass
例如，
self._event: EventClass = event
# module_b.py
import multiprocessing
from multiprocessing.synchronize import Event as EventClass
event: EventClass = multiprocessing.Event()
def cancel_task():
event.set()
英文:
As suggested by @Aaron, the new changes as below
# module_a.py
from multiprocessing.synchronize import Event as EventClass
replace Event with EventClass
for eg,
self._event: EventClass = event
# module_b.py
import multiprocessing
from multiprocessing.synchronize import Event as EventClass
event: EventClass = multiprocessing.Event()
def cancel_task():
event.set()
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