目录技术背景实现步骤1. 使用len()函数2. 自定义计数函数3. 使用operator.length_hint()（python 3.4+）4. 自定义类并添加length属性核心代码最佳实践常见问题技术背景
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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