在一个键值可以是散列或多项数组的数据结构上循环时，如何不重复代码？

class CloudDataStructureIterator:
    def __init__(self, data_structure):
        self.data_structure = data_structure
        self.index = 0

    def __iter__(self):
        return self

    def __next__(self):
        if self.index >= len(self.data_structure):
            raise StopIteration
        value = self.data_structure[self.index]
        self.index += 1
        return value

# 使用示例
data_structure = {'key1': 'value1', 'key2': 'value2', 'key3': 'value3'}
iterator = CloudDataStructureIterator(data_structure)
for value in iterator:
    print(value)