目录一、join()方法的核心机制基本语法底层原理二、参数类型深度解析合格的可迭代对象类型常见无效参数示例三、6种实际应用场景场景1：基础字符串列表拼接场景2：处理字典值场景3：多类型数据转换拼接场景4：高效处理
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