python-3.7.0_python3.7.9?

详见官方文档：https://peps.python.org/pep-0557/

dataclass 可以方便类的定义。
举个简单的例子：

from dataclasses import dataclass

@dataclass
class Person:
	name: str = ""
	age: int = 20
	weight: float =20.0

相当于=

class OldPerson:
	def __init__(self, name="Mark", age=10, weight=20.0)
		self.name = name
		self.age = age
		self.weight = weight
	def __repr__(self):
		return f"Person(name={self.name}, age={self.age}, weight={self.weight})"