迭代器模式深度指南：遍历集合的艺术
迭代器模式是一种行为设计模式，提供了一种顺序访问集合元素的方法，而无需暴露集合的底层表示。
为什么需要迭代器模式？
直接遍历暴露了内部结构：
for i in range(len(collection)):
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