最近在研究learning to rank算法，然后就找到了一个宝贝：https://github.com/JK-SUN/cikm12-vs-cf-sourcecode

于是我就通过百度网盘把代码数据下载下来，然后在运行时就报了这个错误：

raceback (most recent call last):
 File "G:softwareCIKM-SourceCodesourcecodeweighted_KendallTauRank_specialty_degree_sim.py", line 169, in <module>
   main('user_user_sim_eachmovie_weight.data')
 File "G:softwareCIKM-SourceCodesourcecodeweighted_KendallTauRank_specialty_degree_sim.py", line 119, in main
   results=pprocess.pmap(calculate_tf,sequence_tf,limit)
 File "G:softwareCIKM-SourceCodesourcecodepprocess.py", line 917, in pmap
   mymap = Map(limit=limit)
 File "G:softwareCIKM-SourceCodesourcecodepprocess.py", line 675, in __init__
   Exchange.__init__(self, *args, **kw)
 File "G:softwareCIKM-SourceCodesourcecodepprocess.py", line 277, in __init__
   self.poller = select.poll()
AttributeError: 'module' object has no attribute 'poll'

是由select.poll()引起的，经检查才知道这个接口仅限于Unix操作系统，windows上不能用。

http://docs.python.org/2/library/select.html

真是可惜，本以为python在哪个操作系统都能用，看来该用Linux还是要用Linux，拿windows来碰运气纯粹是浪费时间。

找到错误原因了，可以睡而无憾了。