try ...except 是最常见的捕获处理异常的结构，其主要作用是将可能出现问题的代码块用try ：包裹起来，不至于出现错误让程序崩溃，无法执行下去
I need to: - start / stop sounds with lengths between 0.1 and 10 seconds - change the playback volume I want to / would like to / would be nice to have to:
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