如何解决odoo中循环时的单例错误？

instances = [MyClass() for _ in range(n)]
for instance in instances:
    # 处理每个实例

instances = (MyClass() for _ in range(n))
for instance in instances:
    # 处理每个实例

instances = []
for _ in range(n):
    instance = MyClass()
    instances.append(instance)
    # 处理每个实例

class MyClass:
    def __init__(self):
        self.value = 0

    def set_value(self, value):
        self.value = value

    def get_value(self):
        return self.value

# 错误的循环方式
instance = MyClass()
for i in range(5):
    instance.set_value(i)
    print(instance.get_value())  # 这将导致所有输出都是4

# 正确的循环方式
instances = [MyClass() for _ in range(5)]
for i, instance in enumerate(instances):
    instance.set_value(i)
    print(instance.get_value())  # 这将正确输出0到4