level2

地址：http://www.pythonchallenge.com/pc/def/ocr.html。
源码：git@code.aliyun.com:qianlizhixing12/PythonChallenge.git。
问题：找出页面源码一点提示注释中的稀有字符。

#!/usr/bin/env python3
# -*- coding:UTF-8 -*-# Level 2import urllib.requesturl = "http://www.pythonchallenge.com/pc/def/ocr.html"
response = urllib.request.urlopen(url)
body = response.read()
response.closeimport rebody = body.decode("utf8")
text = re.search("<!--\n%%(.|\s)+\n-->", body).group(0)
lisall = []
liscop = []for x in text:if not x.isalpha():passelif x not in lisall:lisall.append(x)elif x not in liscop:liscop.append(x)else:passlis = [x for x in lisall if x not in liscop]
print("Level 2:", ''.join(lis))