Python 抛出异常
抛出异常
作为一名 Python 开发人员，你可以在某些条件发生时选择抛出异常。
要抛出（或引发）异常，请使用 raise 关键字。
raise 关键字用于引发异常。
你可以定义要引发的错误类型以及要打印给用户的文本。
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