python - 从父类(super class)实例化子类

Question

我需要从父类(super class)实例化一个子类。

class Superclass(object):
    @staticmethod
    def get_instance():
        #This should return an instance of subclass1 or subclass2

class Subclass1(Superclass):
    pass
class Subclass2(Superclass):
    pass

我想写:

Subclass1.get_instance()

获取Subclass1实例，Subclass2同理

Answer 1

使用@classmethod代替@staticmethod:

class Superclass(object):
    @classmethod
    def get_instance(cls):
        #This should return an instance of subclass1 or subclass2
        return cls()

class Subclass1(Superclass):
    pass
class Subclass2(Superclass):
    pass