【原创】pythonchalleng——第5题

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第五题的网址：http://www.pythonchallenge.com/pc/def/peak.html，如果大家访问不了该网站，可以看看下面的网站截图。

2011-07-18_185730

这道题比上一道题好，最起码还给点提示，“pronounce it”，但是发什么音呢？这就是一个土堆呀……我们看看标题，“peak hell”，原来是这个词组的发音。我们知道发音，但是不知道下一题的网址……还是看看页面的源代码吧，应该有更多的提示。

<html> 
<head> 
  <title>peak hell</title> 
  <link rel="stylesheet" type="text/css" href="../style.css"> 
</head> 
<body> 
<center> 
<img src="peakhell.jpg"/> 
<br><font color="#c0c0ff"> 
pronounce it 
<br> 
<peakhell src="banner.p"/> 
</body> 
</html> 
<!-- peak hell sounds familiar ? -->

源代码给我们的提示虽少，但是很关键。

<!-- peak hell sounds familiar ? –>
<peakhell src="banner.p"/>

第一个提示信息让我们想一想“peak hell”的发音跟什么比较像……这个我可想不出来，不过我们可以到“Python Documentation”中去翻一翻。对，就在“index”中查看以P开头的对象。

P 
PATH (environment variable), [Link]  
pickle (standard module)  
pop() (list method)  Python3000  
PYTHONPATH (environment variable), [Link], [Link], [Link], [Link]  
PYTHONSTARTUP (environment variable), [Link]

哈哈，找到了，就是pickle，和“peak hell”发音的确相似。

第二个提示信息很奇怪吧，这个不是html的标签呀，而且banner.p好像一个文件啊！我们试一试把它下载下来。下载完banner.p后，用文本编辑器打开，果然有东西，但是不知道这些是什么信息。没关系，上面不是提示我们使用pickle了嘛，学习一下pickle就知道了。

什么是pickle？看看官方文档就知道了。

The pickle module implements a fundamental, but powerful algorithm for serializing and de-serializing a Python object structure. ``Pickling'' is the process whereby a Python object hierarchy is converted into a byte stream, and ``unpickling'' is the inverse operation, whereby a byte stream is converted back into an object hierarchy. Pickling (and unpickling) is alternatively known as ``serialization'', ``marshalling,''^13.1 or ``flattening'', however, to avoid confusion, the terms used here are ``pickling'' and ``unpickling''.

看看banner.p中不知所云的字符，我们知道，我们要将它们转换成python对象了。

''' 
Created on 2011-7-18 
@author: hengha 
''' 
import pickle 
def unpickling(path): 
    f=open(path) 
    obj=pickle.load(f) 
    return obj 
     
if __name__ == '__main__': 
    result=unpickling('banner.p') 
    print result

激动人心的时刻到来了，让我们看看打印的结果：

[[(' ', 95)], [(' ', 14), ('#', 5), (' ', 70), ('#', 5), (' ', 1)], [(' ', 15), ('#', 4), (' ', 71), ('#', 4), (' ', 1)], [(' ', 15), ('#', 4), (' ', 71), ('#', 4), (' ', 1)], [(' ', 15), ('#', 4), (' ', 71), ('#', 4), (' ', 1)], [(' ', 15), ('#', 4), (' ', 71), ('#', 4), (' ', 1)], [(' ', 15), ('#', 4), (' ', 71), ('#', 4), (' ', 1)], [(' ', 15), ('#', 4), (' ', 71), ('#', 4), (' ', 1)], [(' ', 15), ('#', 4), (' ', 71), ('#', 4), (' ', 1)], [(' ', 6), ('#', 3), (' ', 6), ('#', 4), (' ', 3), ('#', 3), (' ', 9), ('#', 3), (' ', 7), ('#', 5), (' ', 3), ('#', 3), (' ', 4), ('#', 5), (' ', 3), ('#', 3), (' ', 10), ('#', 3), (' ', 7), ('#', 4), (' ', 1)], [(' ', 3), ('#', 3), (' ', 3), ('#', 2), (' ', 4), ('#', 4), (' ', 1), ('#', 7), (' ', 5), ('#', 2), (' ', 2), ('#', 3), (' ', 6), ('#', 4), (' ', 1), ('#', 7), (' ', 3), ('#', 4), (' ', 1), ('#', 7), (' ', 5), ('#', 3), (' ', 2), ('#', 3), (' ', 5), ('#', 4), (' ', 1)], [(' ', 2), ('#', 3), (' ', 5), ('#', 3), (' ', 2), ('#', 5), (' ', 4), ('#', 4), (' ', 3), ('#', 3), (' ', 3), ('#', 4), (' ', 4), ('#', 5), (' ', 4), ('#', 4), (' ', 2), ('#', 5), (' ', 4), ('#', 4), (' ', 3), ('#', 3), (' ', 5), ('#', 3), (' ', 3), ('#', 4), (' ', 1)], [(' ', 1), ('#', 3), (' ', 11), ('#', 4), (' ', 5), ('#', 4), (' ', 3), ('#', 3), (' ', 4), ('#', 3), (' ', 4), ('#', 4), (' ', 5), ('#', 4), (' ', 2), ('#', 4), (' ', 5), ('#', 4), (' ', 2), ('#', 3), (' ', 6), ('#', 4), (' ', 2), ('#', 4), (' ', 1)], [(' ', 1), ('#', 3), (' ', 11), ('#', 4), (' ', 5), ('#', 4), (' ', 10), ('#', 3), (' ', 4), ('#', 4), (' ', 5), ('#', 4), (' ', 2), ('#', 4), (' ', 5), ('#', 4), (' ', 2), ('#', 3), (' ', 7), ('#', 3), (' ', 2), ('#', 4), (' ', 1)], [('#', 4), (' ', 11), ('#', 4), (' ', 5), ('#', 4), (' ', 5), ('#', 2), (' ', 3), ('#', 3), (' ', 4), ('#', 4), (' ', 5), ('#', 4), (' ', 2), ('#', 4), (' ', 5), ('#', 4), (' ', 1), ('#', 4), (' ', 7), ('#', 3), (' ', 2), ('#', 4), (' ', 1)], [('#', 4), (' ', 11), ('#', 4), (' ', 5), ('#', 4), (' ', 3), ('#', 10), (' ', 4), ('#', 4), (' ', 5), ('#', 4), (' ', 2), ('#', 4), (' ', 5), ('#', 4), (' ', 1), ('#', 14), (' ', 2), ('#', 4), (' ', 1)], [('#', 4), (' ', 11), ('#', 4), (' ', 5), ('#', 4), (' ', 2), ('#', 3), (' ', 4), ('#', 4), (' ', 4), ('#', 4), (' ', 5), ('#', 4), (' ', 2), ('#', 4), (' ', 5), ('#', 4), (' ', 1), ('#', 4), (' ', 12), ('#', 4), (' ', 1)], [('#', 4), (' ', 11), ('#', 4), (' ', 5), ('#', 4), (' ', 1), ('#', 4), (' ', 5), ('#', 3), (' ', 4), ('#', 4), (' ', 5), ('#', 4), (' ', 2), ('#', 4), (' ', 5), ('#', 4), (' ', 1), ('#', 4), (' ', 12), ('#', 4), (' ', 1)], [(' ', 1), ('#', 3), (' ', 11), ('#', 4), (' ', 5), ('#', 4), (' ', 1), ('#', 4), (' ', 5), ('#', 3), (' ', 4), ('#', 4), (' ', 5), ('#', 4), (' ', 2), ('#', 4), (' ', 5), ('#', 4), (' ', 2), ('#', 3), (' ', 12), ('#', 4), (' ', 1)], [(' ', 2), ('#', 3), (' ', 6), ('#', 2), (' ', 2), ('#', 4), (' ', 5), ('#', 4), (' ', 2), ('#', 3), (' ', 4), ('#', 4), (' ', 4), ('#', 4), (' ', 5), ('#', 4), (' ', 2), ('#', 4), (' ', 5), ('#', 4), (' ', 3), ('#', 3), (' ', 6), ('#', 2), (' ', 3), ('#', 4), (' ', 1)], [(' ', 3), ('#', 3), (' ', 4), ('#', 2), (' ', 3), ('#', 4), (' ', 5), ('#', 4), (' ', 3), ('#', 11), (' ', 3), ('#', 4), (' ', 5), ('#', 4), (' ', 2), ('#', 4), (' ', 5), ('#', 4), (' ', 4), ('#', 3), (' ', 4), ('#', 2), (' ', 4), ('#', 4), (' ', 1)], [(' ', 6), ('#', 3), (' ', 5), ('#', 6), (' ', 4), ('#', 5), (' ', 4), ('#', 2), (' ', 4), ('#', 4), (' ', 1), ('#', 6), (' ', 4), ('#', 11), (' ', 4), ('#', 5), (' ', 6), ('#', 3), (' ', 6), ('#', 6)], [(' ', 95)]]

不是我们期待的结果，还需要我们继续努力呀！我们获得的是一个list，里面的元素还是list，而且这些子list的元素个数不同。这些子list中的元素是元组，前面的不是' '，就是'#'，后面的是数字。不过我们认真看一下，会发现一个特点，就是每个子list中的数字之和等于95。例如第二个子list，14+5+70+5+1=95。这是不是在用' '和'#'画图呀！我们试一试就知道了，修改代码如下：

''' 
Created on 2011-7-18 
@author: hengha 
''' 
import pickle 
def unpickling(path): 
    f=open(path) 
    obj=pickle.load(f) 
    return obj 
if __name__ == '__main__': 
    result=unpickling('banner.p') 
    for sublist in result: 
        str='' 
        for (a,b) in sublist: 
            str+=a*b 
        print str

这下再看看程序的结果：

                                                                                                
              #####                                                                      #####  
               ####                                                                       ####  
               ####                                                                       ####  
               ####                                                                       ####  
               ####                                                                       ####  
               ####                                                                       ####  
               ####                                                                       ####  
               ####                                                                       ####  
      ###      ####   ###         ###       #####   ###    #####   ###          ###       ####  
   ###   ##    #### #######     ##  ###      #### #######   #### #######     ###  ###     ####  
  ###     ###  #####    ####   ###   ####    #####    ####  #####    ####   ###     ###   ####  
 ###           ####     ####   ###    ###    ####     ####  ####     ####  ###      ####  ####  
 ###           ####     ####          ###    ####     ####  ####     ####  ###       ###  ####  
####           ####     ####     ##   ###    ####     ####  ####     #### ####       ###  ####  
####           ####     ####   ##########    ####     ####  ####     #### ##############  ####  
####           ####     ####  ###    ####    ####     ####  ####     #### ####            ####  
####           ####     #### ####     ###    ####     ####  ####     #### ####            ####  
 ###           ####     #### ####     ###    ####     ####  ####     ####  ###            ####  
  ###      ##  ####     ####  ###    ####    ####     ####  ####     ####   ###      ##   ####  
   ###    ##   ####     ####   ###########   ####     ####  ####     ####    ###    ##    ####  
      ###     ######    #####    ##    #### ######    ###########    #####      ###      ######

看到这个结果，我们终于放心了，这道题基本解决了！让我们试一试将peak换成channel，成功进入下一道题！

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