如何删除类的重复实例

class MyClass:
    def __init__(self, prop1, prop2):
        self.prop1 = prop1
        self.prop2 = prop2

# 创建对象实例
obj1 = MyClass("value1", "value2")
obj2 = MyClass("value1", "value2")
obj3 = MyClass("value3", "value4")
obj4 = MyClass("value1", "value2")

# 存储已遍历的对象实例
visited_instances = []

# 遍历对象实例
for obj in [obj1, obj2, obj3, obj4]:
    # 检查是否存在相同属性值的对象实例
    if obj not in visited_instances:
        visited_instances.append(obj)
    else:
        # 删除重复实例
        del obj

# 打印结果
for obj in visited_instances:
    print(obj.prop1, obj.prop2)