如何动态更改Dataclass属性的默认值？

发布于 2025-01-27 03:42:42 字数 265 浏览 2 评论 0原文

我想知道是否可以（动态地）在dataclass中进行默认参数值，以实现这样的事情：

from dataclasses import dataclass

@dataclass
class Foo:
    bar = "foobar"

Foo.bar = "world"

foo1 = Foo(bar="hello")  # foo1.bar = "hello"
foo2 = Foo()  # foo2.bar = "world"

原文

I would like to know if it is possible to change (dynamically) a default argument value in a dataclass, to achieve something like this:

from dataclasses import dataclass

@dataclass
class Foo:
    bar = "foobar"

Foo.bar = "world"

foo1 = Foo(bar="hello")  # foo1.bar = "hello"
foo2 = Foo()  # foo2.bar = "world"

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嗼ふ静 2025-02-03 03:42:42

您应该继承数据级：

from dataclasses import dataclass

@dataclass
class Foo:
    bar = "foobar"

Foo.bar = "world"

foo1 = Foo(bar="hello")  # foo1.bar = "hello"
foo2 = Foo()  # foo2.bar = "world"

from dataclasses import dataclass

@dataclass
class NewFoo(Foo):
    bar = "world"



foo1 = Foo(bar="hello")  # foo1.bar = "hello"
foo2 = NewFoo()  # foo2.bar = "world"

You should inherit your dataclass:

from dataclasses import dataclass

@dataclass
class Foo:
    bar = "foobar"

Foo.bar = "world"

foo1 = Foo(bar="hello")  # foo1.bar = "hello"
foo2 = Foo()  # foo2.bar = "world"

from dataclasses import dataclass

@dataclass
class NewFoo(Foo):
    bar = "world"



foo1 = Foo(bar="hello")  # foo1.bar = "hello"
foo2 = NewFoo()  # foo2.bar = "world"

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