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文件与 JSON

写入和读取文本文件，逐行处理文件内容，并把结构化数据保存为 JSON。

1. Overview

Overview

2. Writing a Text File

Writing a Text File

3. Reading Line by Line

Reading Line by Line

4. Appending to a File

Appending to a File

5. Saving Structured Data as JSON

Saving Structured Data as JSON

6. Write and Count

Write and Count

7. A Record as JSON

A Record as JSON

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