The Python Challenge(3)

问题链接

问题链接如下：

http://www.pythonchallenge.com/pc/def/ocr.html

答案链接

答案链接如下：

http://www.pythonchallenge.com/pc/def/equality.html

解题思路

根据页面提示：

recognize the characters. maybe they are in the book, 
but MAYBE they are in the page source.

阅读源码，有如下内容：

编写代码从中提取出字符串即可：

from urllib import request
from html.parser import HTMLParser

class HandleComment(HTMLParser):
    def handle_comment(self, data):
        for c in data:
            if c.isalnum() or c == ' ':
                print(c, end='')

        print()


url = 'http://www.pythonchallenge.com/pc/def/ocr.html'
response = request.urlopen(url)
content = response.read()
hc = HandleComment()
hc.feed(str(content, 'utf-8'))
hc.close()

最终获得字符串equality，替换掉问题URL中的ocr即得到最终链接。