分解工会的最佳方法

发布于 2025-01-29 00:14:50 字数 602 浏览 0 评论 0 原文

目标是坚持完全静态打字。 “解决”工会/可选类型并满足Mypy的最佳方法是什么？例如：

from typing import Optional

def foo() -> bool:
    item: Optional[str] = find() # here find is some arbitrary search which returns a string in case something was found or None if nothing found.
    if(item == None):
        return False # Nothing found in the first place, could not execute bar()
    else:
        return bar(item) # here mypy is unsatisfied and tells me, that type Optional[str] is not applicable to type str.

def bar(str) -> bool:
    .....

那么，将可选的[str]“铸造”到str的最佳方法是什么？这是一种特定的毕pythonian方法吗？

原文

Goal is to stick to fully static typings. What is the best way to "resolve" a Union/Optional type and satisfy mypy?
For Example:

from typing import Optional

def foo() -> bool:
    item: Optional[str] = find() # here find is some arbitrary search which returns a string in case something was found or None if nothing found.
    if(item == None):
        return False # Nothing found in the first place, could not execute bar()
    else:
        return bar(item) # here mypy is unsatisfied and tells me, that type Optional[str] is not applicable to type str.

def bar(str) -> bool:
    .....

So what would be the best way to "cast" the Optional[str] to str? Is tehre a specific pythonian way to do that?

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野生奥特曼 2025-02-05 00:14:50

好的，在发布问题后，我在“相关”问题中找到了答案。
因此，这取决于：

正确的代码块将是：

from typing import Optional

def foo() -> bool:
    item: Optional[str] = find() # here find is some arbitrary search which returns a string in case something was found or None if nothing found.
    if(isinstance(item, str)):
        return bar(item) # OK for mypy
    else:
        return False # Nothing found in the first place, could not execute bar()

def bar(str) -> bool:
    .....

Okay, after Posting the question I found an answer in the "Related" questions.
So this is taken from:
Use attribute from Optional[Union[str, int]] parameter depending on its type

The correct code block would be:

from typing import Optional

def foo() -> bool:
    item: Optional[str] = find() # here find is some arbitrary search which returns a string in case something was found or None if nothing found.
    if(isinstance(item, str)):
        return bar(item) # OK for mypy
    else:
        return False # Nothing found in the first place, could not execute bar()

def bar(str) -> bool:
    .....

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