append function problem?

[randomtalk at gmail.com]

hello, recently i tried to use list.append() function in seemingly
logical ways, however, i cannot get it to work, here is the test code:

>>> seed = [2, 3, 4, 5]
>>> next = 7
>>> seed1 = seed.append(next)
>>> seed1
>>> print(str(seed1))
None
>>> def test(lst):
... 	print(str(lst))
...
>>> test(seed.append(next))
None

I'm using Activestate python (latest) on win xp sp2..

I'm not sure why seed1 and the function doesn't recognize the list..

If anyone can point out where i'm going wrong would be much
appreciated!
Thanks in advance!