[Tutor] remove blank list items

[Luke Paireepinart]

Terry Carroll wrote:
> On Fri, 14 Sep 2007, Michael Langford wrote:
>
>   
>>   What you want is a set, not a list. Lucky for you, a python dict uses a
>> set for its keys, so cheat and use that.
>>     
>
> Is that true?
>
>   
>>>> d={1:"a", 2:"b"}
>>>> k=d.keys()
>>>> type(k)
>>>>         
> <type 'list'>
>   
He worded it incorrectly since there is actually a 'set' type, but what 
he meant was that there wouldn't be multiples of each key that you add, 
so you would effectively eliminate multiples and thus have a set when 
you get a list of dict keys.
-Luke