IndexError: pop index out of range

[Carlos Nepomuceno]

Your "for idx, val in enumerate(words):" is running on words not list_temp.
As you remove from list_temp and keeps parsing words you get the IndexError.
________________________________
> From: formisc at gmail.com 
> Date: Wed, 15 May 2013 00:22:05 -0400 
> Subject: IndexError: pop index out of range 
> To: python-list at python.org 
>  
> hello, 
>   going fru some basic examples and can't figureout why the following  
> errors out. Help is very much appreciated: 
> <code> 
> def front_x(words): 
>    # +++your code here+++ 
>      print "words passed : ", words 
>      list_xx = [] 
>      list_temp = words[:] 
>      print "list_temp -", list_temp 
>      print "words -", words 
>      for idx, val in enumerate(words): 
>          print val, idx 
>          # str_idx = val.find('x',0,2) 
>          if val[0] == 'x': 
>              vl = list_temp.pop(idx) 
>              list_xx.append(vl) 
>  
>              print "appending list_xx", list_xx 
>  
>      list_xx.sort 
>      list_temp.sort 
>      print "words sorted : " + str(words) 
>      print "list_temp sorted : ", list_temp 
>      list_xx.append(words) 
>      print "list_xx" + str(list_xx) 
>      return True 
>  
> front_x 
> words passed : ['bbb', 'ccc', 'axx', 'xzz', 'xaa'] 
> list_temp - ['bbb', 'ccc', 'axx', 'xzz', 'xaa'] 
> words - ['bbb', 'ccc', 'axx', 'xzz', 'xaa'] 
> bbb 0 
> ccc 1 
> axx 2 
> xzz 3 
> appending list_xx ['xzz'] 
> xaa 4 
> Traceback (most recent call last): 
>    File  
> "/home/az/work/Python/Google_Course/google-python-exercises/basic/list1.py",  
> line 119, in <module> 
>      main() 
>    File  
> "/home/az/work/Python/Google_Course/google-python-exercises/basic/list1.py",  
> line 100, in main 
>      test(front_x(['bbb', 'ccc', 'axx', 'xzz', 'xaa']), 
>    File  
> "/home/az/work/Python/Google_Course/google-python-exercises/basic/list1.py",  
> line 55, in front_x 
>      vl = list_temp.pop(idx) 
> IndexError: pop index out of range 
>  
> </code> 
>  
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