如果您无法访问服务器的统计数据，可以用下面这些免费或低价的产品获得关于页面的统计数据。

To track statistics on your pages (assuming you don't have access to server statistics), try these free and low-cost options.

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用下面的角色卡片，表演这些情景。

Use the role cards below to act out the situations.

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可以用下面的代码测试这个Factorial类，可以在文件factorial . py中找到这些代码(请参阅参考资料)。

You can test your factorial class using the following code, which you'll also find in the file factorial.py (see Resources).

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