python challenge
from: http://www.cnblogs.com/jimnox/archive/2009/12/08/tips-to-python-challenge.html
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http://www.pythonchallenge.com/pc/def/0.html
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http://www.pythonchallenge.com/pc/def/274877906944.html
http://www.pythonchallenge.com/pc/def/map.html
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http://www.pythonchallenge.com/pc/def/ocr.html
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http://www.pythonchallenge.com/pc/def/equality.html
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http://www.pythonchallenge.com/pc/def/linkedlist.html
http://www.pythonchallenge.com/pc/def/linkedlist.php
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http://www.pythonchallenge.com/pc/def/peak.html
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http://www.pythonchallenge.com/pc/def/channel.html
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http://www.pythonchallenge.com/pc/def/oxygen.html
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by AKara 2009-04-23 @ http://blog.csdn.net/akara @ akaras@163.com
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