防止平台依赖的Python代码中的mypy错误

发布于 2025-01-22 05:53:13 字数 732 浏览 1 评论 0原文

我有类似于以下python代码的内容：

import platform
if platform.system() == "Windows":
    import winreg
    import win32api

def do_cross_platform_thing() -> None:
    if platform.system() == "Windows":
        # do some overly complicated windows specific thing with winreg and win32api
    else:
        # do something reasonable for everyone else

现在，在Linux上，mypy抱怨

它缺少导入，因为win32api不存在，
”模块没有属性。 ..“因为winreg模块是定义，但基本上是禁用的（所有代码均为“ Windows”检查后面）。

有什么合理的方法可以解决吗？我当前的解决方案是

垃圾邮件＃类型：ignore无处不在
- 忽略 - 密码imports

有什么更好的解决方案吗？

原文

I have something akin to the following piece of python code:

import platform
if platform.system() == "Windows":
    import winreg
    import win32api

def do_cross_platform_thing() -> None:
    if platform.system() == "Windows":
        # do some overly complicated windows specific thing with winreg and win32api
    else:
        # do something reasonable for everyone else

Now, on linux, mypy complains that

it's missing imports because win32api doesn't exist,
"module has no attribute ..." because the winreg module is
defined, but basically disabled (all code is behind an 'is windows' check).

Is there any reasonable way to deal with this ? My current solution is

spamming # type: ignore everywhere
--ignore-missing-imports

Are there any better solutions for this?

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眼前雾蒙蒙 2025-01-29 05:53:13

好的，检查

if platform.system() == "Windows"

语义上相同的检查更改为：

if sys.platform == "win32"

仅此第二版触发了一些魔术的内置特殊情况。
将其标识为平台检查，而忽略了分支
适用于其壁画。

Ok, after checking the Docs as @SUTerliakov so kindly suggested,
it seems that i have to change my

if platform.system() == "Windows"

to this, semantically identical check:

if sys.platform == "win32"

Only this second version triggers some magic builtin mypy special case that
identifies this as a platform check and ignores the branch not
applicable to its plattform.

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叫嚣ゝ 2025-01-29 05:53:13

您可以使用

# type: ignore[some-mypy-code,unused-ignore]

语法以mypy 1.4 （发布2023-06-20，pr 15164 ）。用您从Mypy获得的错误代码替换某些元代码。从PR中获取的示例：

try:
    import graphlib  # type: ignore[import,unused-ignore]
except ImportError:
    pass

在上面的中忽略[import]忽略导入错误（例如，在python 3.7上，其中 graphlib 不存在）和忽略[unused-ignore]忽略由warn_unused_ignores Mypy设置，例如Python 3.9此模块可用。

You may use the

# type: ignore[some-mypy-code,unused-ignore]

syntax introduced in Mypy 1.4 (Released 2023-06-20, PR 15164). Replace the some-mypy-code with the error code which you get from mypy. Example taken from the PR:

try:
    import graphlib  # type: ignore[import,unused-ignore]
except ImportError:
    pass

In the above, the ignore[import] ignores the import error (on Python 3.7 for example, where graphlib does not exist) and ignore[unused-ignore] ignores the error caused by the warn_unused_ignores mypy setting on e.g. Python 3.9 where this module is available.

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