how to remove duplicated elements in a list?

[Tim N. van der Leeuw]

Another way to do this, that also maintains order, is:

>>> l = [3, 1, 'a', '@', -4, 'z', 'r', 1, '@', -4]
>>> s = set()
>>> l2 = []
>>> for v in l:
... 	if not v in s:
... 		s.add(v)
... 		l2.append(v)
...
>>> l2
[3, 1, 'a', '@', -4, 'z', 'r']


I have no idea whether or not this is more efficient than the other
method; try it on big lists if you want to know. (But I like the idea
that I'm not looking up indexes in the old list all the time, which
just feels slow to me)

cheers,

--Tim