本文介绍了Python Challenge的第二关解决方案，重点在于使用OCR技术识别字符。提示玩家检查网页源代码，从中找到乱码并进行解密。通过爬取网页，正则表达式提取关键信息，最终解码后跳转到下一关地址http://www.pythonchallenge.com/pc/def/equality.html。
Python Challenge 第 2 关攻略：ocr
题目地址
http://www.pythonchallenge.com/pc/def/ocr.html
题目内容
recognize the characters. maybe they are in the book,
but MAYBE they are in the page source.
General tips:
- Use the hints. They are helpful, most of the times.
- Investigate the data given to you.
- Avoid looking for spoilers.
Forums: Python Challenge Forums, read before you post.
IRC: irc.freenode.net #pythonchallenge
To see the solutions to the previous level, replace pc with pcc, i.e. go to: http://www.pythonchallenge.com/pcc/def/ocr.html
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