python - 如何使用python类型提示动态地将父方法的返回类型指定为子类？

Question

我想知道如果我想让 IDE 自动提示子方法应该怎么做？以下代码在 Pycharm 2019.2 中不起作用

我只能在父类中添加类型提示，但“最终类型”应该在子类中动态确定

from typing import TypeVar, List

T = TypeVar("T")


class Node:
    def __init__(self: T, neighbours: List[T]):
        self.neighbours = neighbours # The "final type" should be determined dynamically

    def get_neighbours(self) -> List[T]:
        return self.neighbours


class ChildNodeA(Node):
    def child_method_a(self):
        pass

class ChildNodeB(Node):
    def child_method_b(self):
        pass

class ChildNodeC(Node):
    def child_method_c(self):
        pass


child_node = ChildNodeA([])

for node in child_node.neighbours:
    node.child_method_a() # I want the pycharm to auto-hint child_method_a 

child_node = ChildNodeB([])
for node in child_node.neighbours:
    node.child_method_b() # I want the pycharm to auto-hint child_method_b

Answer 1

你是说

class ChildNode(Node):
    def child_method(self) -> str:
        return 'test'