how to flatten one level of list of lists?

[George Young]

I have a list like:
  l = [[2], [3], [5], [11]]
and I want to get:
  ll = [2, 3, 5, 11]

I know I can do something like:
  ll = map(lambda i: i[0],l) 

but it seems like overkill to have to use a lamba for such a simple
task.
Is there some easy way I'm missing?  

BTW, I tried to use l.__getitem__ or l.__getslice__ with map, but both
failed with AttributeError.  (this is python 2.1)  The 2.1 docs seem to
say these members exist for
lists -- what's wrong?

Thanks,
	George
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