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python使用urllib.request.urlretrieve下载图片到文件，怎么感觉是一个异步的过程

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python使用urllib.request.urlretrieve下载图片到文件，怎么感觉是一个异步的过程

微信截图_20200504100600.png
会下载24张图片，但不是像以前那样，文件名从0开始下载，而是不断地覆盖23.jpg这个文件名，请问这是什么问题呢？（特别像js的异步与闭包）


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