Python Challenge[6]

[Level 6]

Python Challenge[6]_第1张图片

Title: now there are pairs

图片下方是一个PayPal捐赠的图片链接,无其他信息,查看源码,有两处注释:

  1. <-- zip
  2. The following has nothing to do with the riddle itself. I just
    thought it would be the right point to offer you to donate to the
    Python Challenge project. Any amount will be greatly appreciated.
    -thesamet

图片上是拉链,英文为zip,源码注释有zip,挺考验脑洞的,修改url中的html为zip后缀,下载到channel.zip文件。打开文件,有readme.txt,打开显示:

welcome to my zipped list.

hint1: start from 90052
hint2: answer is inside the zip

和Level 4类似,不断读取文件直至找到答案。

num = '90052'
suffix = '.txt'
while True:
  try:
    with open('channel/'+num+suffix,encoding='utf-8') as f:
      data = f.read()
      print(data)#Next nothing is 83831
      num = data.split(' ')[-1]
  except:
    break

最后的提示是Collect the comments.。不懂,查看官方文档,搜索comment无果,搜索zip,有zipfile模块,在该页中搜索comment,出现两处:ZipFile.commentZipInfo.comment。使用第一个无果,使用第二个。

import zipfile
comments = []
with zipfile.ZipFile('channel.zip') as zf:
  while True:
    try:
      zi = zf.getinfo(num+suffix)
      comments.append(zi.comment.decode('utf-8'))
      data = zf.read(num+suffix).decode('utf-8')
      num = data.split(' ')[-1]
    except:
      break
print(''.join(comments))

得到

Python Challenge[6]_第2张图片
result

大大的 hockey,修改url,hockey.html显示 it's in the air. look at the letters.,每个大的字母都是由相同的字母组合成,即 oxygen,正好对应提示, [Level 7]

小结

  1. zipfile.ZipFile(file, mode='r', compression=ZIP_STORED, allowZip64=True)返回ZipFile对象,可用于读取压缩的文件。
  2. ZipFile.getinfo(name)返回ZipInfo对象。
  3. ZipInfo.comment返回成员的注释。
  4. ZipFile.read(name, pwd=None)读取其中的压缩文件。

Python Challenge Wiki

一种不下载channel.zip文件的方法:

import io,zipfile,urllib.request
zf = zipfile.ZipFile(io.BytesIO(urllib.request.urlopen('http://pythonchallenge.com/pc/def/channel.zip').read()))


1. [`class io.BytesIO([initial_bytes])`](https://docs.python.org/3/library/io.html?highlight=bytesio#io.BytesIO)可以像在二进制模式下打开的文件一样使用。

####[More](http://wiki.pythonchallenge.com/index.php?title=Level6:Main_Page)

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