擅长:python、mysql、java
<p>您需要使用<a href="https://docs.python.org/3/library/typing.html#typing.TypeVar" rel="nofollow noreferrer">TypeVar</a>。在</p>
<pre><code>from typing import TypeVar
PersonType = TypeVar("PersonType", bound="Person")
class Person:
@classmethod
def from_dict(self, info: dict) -> PersonType:
person_obj = Person(info['name'])
return person_obj
</code></pre>