如何模拟类变量

class MyClass:
    class_variable = "This is a class variable"

print(MyClass.class_variable)  # 输出：This is a class variable

my_instance = MyClass()
print(my_instance.class_variable)  # 输出：This is a class variable

class MyClass:
    @classmethod
    def class_method(cls):
        cls.class_variable = "This is a class variable"

MyClass.class_method()
print(MyClass.class_variable)  # 输出：This is a class variable

my_instance = MyClass()
print(my_instance.class_variable)  # 输出：This is a class variable

class MyClass:
    @property
    def class_variable(self):
        return "This is a class variable"

print(MyClass().class_variable)  # 输出：This is a class variable