如何动态更改数据类属性的默认值？

Question

我想知道是否可以（动态地）更改 dataclass 中的默认参数值以实现如下目的：

from dataclasses import dataclass

@dataclass
class Foo:
    bar = "foobar"

Foo.bar = "world"

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

Answer 1

您应该继承您的数据类：

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"