newbe question about lists

[Fredrik S]

Sorry for this simple question, but I can't go to sleep before I
have solved it.

I am running python on Beos for the first
time.

I'm going through a study course online, and ringt now I
am trying lists.

I type the following:
>>>
l1=["a1","a2","a3"]
>>> l2=["a4","a5","a6"]
>>> l3=l1
>>>
l3[1:1]=l2
>>> l3
['a1', 'a3', 'a4', 'a2']
>>> l1
['a1', 'a3',
'a4', 'a2']

QUESTION:
Why is value of l1 changed... The only
thing I can think of is B U G ...

Can anyone help me out...



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