Trouble with list comprehension

[Steve Holden]

Shane Lillie wrote:
> I've got a bit of code that looks like this:
> 
> for i in xrange(1000):
>     # shuffle the doors
>     doors = [ 'G', 'C', 'G' ]
>     random.shuffle(doors)
> 
>     # save the doors that have goats (by index)
>     goats = [ x for x in range(2) if doors[x] == 'G' ]
> 
> but for some reason the list comprehension is not always returning a
> list with 2 elements in it (sometimes it will be just 1 element). I've
> tried changing to a generator as well as using filter() and all 3 give
> the same sort of results. It works if I use a loop, but I'd really
> like to know what I'm doing wrong here. Everything looks like it
> should be working.
> 
> Thanks in advance for any suggestions.

Hint: len(range(2)) != 3

regards
  Steve
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