在编写类的接口的时候如何指明参数类型为本类

class A():
    def __init__(self):
        pass

    def func(pra1:A):
        pass

这种情况下，在def func(par1:A) 中的A会报错，因为类A没有生成。请问这这种如何解决

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Jason990420

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最佳答案

For different versions of Python

In Python 3.6 or below, you should use a string - 'A'

In PEP 484 – Type Hints

Forward references

When a type hint contains names that have not been defined yet, that definition may be expressed as a string literal, to be resolved later.
In Python 3.7 ~ 3.10, you can add statement from __future__ import annotations
In Python 3.11+, you can use from typing import Self, then use def func(pra1:Self):

1年前评论

讨论数量: 2

Jason990420

1.9k 声望 / 個人 @ 個人

For different versions of Python

In Python 3.6 or below, you should use a string - 'A'

In PEP 484 – Type Hints

Forward references

When a type hint contains names that have not been defined yet, that definition may be expressed as a string literal, to be resolved later.
In Python 3.7 ~ 3.10, you can add statement from __future__ import annotations
In Python 3.11+, you can use from typing import Self, then use def func(pra1:Self):

1年前评论

runstone

见习助教 273 声望

如一楼所说，加 双引号 就可以，或者 from __future__ import annotations。当然py311你还可以用 from typing import Self 代替。

1年前评论

讨论应以学习和精进为目的。请勿发布不友善或者负能量的内容，与人为善，比聪明更重要！

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在编写类的接口的时候 如何指明参数类型为本类