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a question about lists

pythonbeginner pythonbeginner is offline
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Join Date: Sep 2012
Posts: 1
I am new to Python. Here is a question I have about lists:
It is said that lists are mutable and tuples are immutable. But when I write the following:

L1 = [1, 2, 3]
L2 = (L1, L1)
L1[1] = 5
print L2

the result is
([1, 5, 3], [1, 5, 3])

instead of
([1, 2, 3], [1, 2, 3])

But L2 is a tuple and tuples are immutable. Why is it that when I change the value of L1, the value of L2 is also changed?
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