问题链接
问题链接如下：
http://www.pythonchallenge.com/pc/def/channel.html
答案链接
答案链接如下：
http://www.pythonchallenge.com/pc/def/oxygen.html
解题思路
根据拉链，得到第一个关键字zip，再继续看源码，有如下信息：
<!-- <-- zip -->
试试将URL改为：http://www.pythonchallenge.com/pc/def/channel.zip，下载解压后，查看其中的readme.txt，有如下信息：
welcome to my zipped list.
hint1: start from 90052
hint2: answer is inside the zip
就是说，答案在zip本身，则有如下代码：
from os import path
from urllib import request
from zipfile import ZipFile
import re
channel_zip = path.join('/tmp', "channel.zip")
url = 'http://www.pythonchallenge.com/pc/def/channel.zip'
response = request.urlopen(url)
content = response.read()
with open(channel_zip, 'wb') as channel:
channel.write(content)
channel = ZipFile(channel_zip, 'r')
hint = 'readme.txt'
while True:
txt = str(channel.read(hint), 'utf-8')
# Step 1
print(txt)
ret = re.findall('\W(\d+)(?:\s|$)', txt)
if len(ret) == 0:
break
hint = ret[0]+'.txt'
最终有如下信息：
Collect the comments.
接下来修改代码，阅读zip的附件信息，则有如下代码：
from os import path
from urllib import request
from zipfile import ZipFile
import re
channel_zip = path.join('/tmp', "channel.zip")
url = 'http://www.pythonchallenge.com/pc/def/channel.zip'
response = request.urlopen(url)
content = response.read()
with open(channel_zip, 'wb') as channel:
channel.write(content)
channel = ZipFile(channel_zip, 'r')
hint = 'readme.txt'
comment = ''
while True:
txt = str(channel.read(hint), 'utf-8')
# Step 1
# print(txt)
# Step 2
print(str(channel.getinfo(hint).comment, 'utf-8'), end='')
ret = re.findall('\W(\d+)(?:\s|$)', txt)
if len(ret) == 0:
break
hint = ret[0]+'.txt'
输出信息如下所示：
****************************************************************
****************************************************************
** **
** OO OO XX YYYY GG GG EEEEEE NN NN **
** OO OO XXXXXX YYYYYY GG GG EEEEEE NN NN **
** OO OO XXX XXX YYY YY GG GG EE NN NN **
** OOOOOOOO XX XX YY GGG EEEEE NNNN **
** OOOOOOOO XX XX YY GGG EEEEE NN **
** OO OO XXX XXX YYY YY GG GG EE NN **
** OO OO XXXXXX YYYYYY GG GG EEEEEE NN **
** OO OO XX YYYY GG GG EEEEEE NN **
** **
****************************************************************
**************************************************************
对应于字符串hockey，将URL改为: http://www.pythonchallenge.com/pc/def/hockey.html，输入到浏览器中，最终页面显示：
it's in the air. look at the letters.
再次观察组成hockey的字符，则得到字符串oxygen，则最终URL为： http://www.pythonchallenge.com/pc/def/oxygen.html。
