目录前言raise 引发异常try... except 捕获异常raise ... from 用法前言 当程序出现错误时，系统会自动触发异常。python 也允许程序自行引发异常，自行引发异常使用 raise 语句来完成。
I\'m developing some tests for a website that contains some PDF content.The instance of IE8 created by WatiN does not open the PDFs in the browser, instead asking to download the file.When I examine t
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