今日学习：
今日阅读：《程序员的十大烦恼》http://www.aqee.net/top-10-things-that-annoy-programmers/
1.pydoc.py在Python安装目录Lib下，用notepad++打开运行。（还没搞懂，还不用。待理解）
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【Remember %r is for debugging and is "raw representation" while %s is for display.】