removing common elemets in a list

[Gary Herron]

saif.shakeel at gmail.com wrote:
> Hi,
>      Suppose i have a list v which collects some numbers,how do i
> remove the common elements from it ,without using the set() opeartor.
>                                                       Thanks
>
>   
Several ways, but probably not as efficient as using a set. (And why 
don't you want to use a set, one wonders???)



 >>> l = [1,2,3,1,2,1]



Using a set:

 >>> set(l)
set([1, 2, 3])



Building the list element by element:

 >>> for e in l:
... if e not in r:
... r.append(e)
...
 >>> print r
[1, 2, 3]



Using a dictionary:

 >>> d = dict(zip(l,l))
 >>> d
{1: 1, 2: 2, 3: 3}
 >>> d.keys()
[1, 2, 3]
 >>>