Created
January 19, 2009 21:19
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| Python Challenge #4 | |
| =================== | |
| URL: http://www.pythonchallenge.com/pc/def/linkedlist.html | |
| is referred to: | |
| URL: http://www.pythonchallenge.com/pc/def/linkedlist.php | |
| Title: Follow the chain | |
| Image: Wooden stone sawing figures | |
| Image has url: http://www.pythonchallenge.com/pc/def/linkedlist.php?nothing=12345 | |
| http://www.pythonchallenge.com/pc/def/linkedlist.php?nothing=12345 | |
| gives: | |
| and the next nothing is 92512 | |
| http://www.pythonchallenge.com/pc/def/linkedlist.php?nothing=92512 | |
| gives | |
| and the next nothing is 64505 | |
| And so on... need to code this. | |
| import urllib | |
| import re | |
| url = r'http://www.pythonchallenge.com/pc/def/linkedlist.php?nothing=' | |
| linkedlist = [] | |
| def get_next_nothing(nothing): | |
| next_row = urllib.urlopen('%s%s'%(url, nothing)).read() | |
| s = re.search('next nothing is ([0123456789]*)', next_row) | |
| if s: | |
| return (s.groups(0)[0], next_row) | |
| else: | |
| return ('', next_row) | |
| >>> while 1: | |
| ... if len(linkedlist) == 0: | |
| ... nothing = '12345' | |
| ... else: | |
| ... (old, nothing, oldtext) = linkedlist[-1] | |
| ... (next, text) = get_next_nothing(nothing) | |
| ... if next: | |
| ... print next | |
| ... linkedlist.append((nothing, next, text)) | |
| ... nothing = next | |
| ... else: | |
| ... print "Unable to parse: %s"%text | |
| ... break | |
| The above goes on till it gets stuck at: | |
| ... | |
| 43240 | |
| 5868 | |
| 19337 | |
| 21122 | |
| 92118 | |
| Unable to parse: Yes. Divide by two and keep going. | |
| Having expected something like this: I added the data: | |
| linkedlist.append(('92118', '46059', 'Yes. Divide by two and keep going.')) | |
| And reran the loop which picks up on the last 'next' | |
| Getting to ... | |
| ... | |
| 27719 | |
| 65667 | |
| Unable to parse: peak.html | |
| Total of 209 requests. | |
| http://www.pythonchallenge.com/pc/def/peak.html |
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