[Tutor] Tuple - Immutable ?

[Sudip Bhattacharya]

>>> s=(1,2,3)
>>> s=s+(4,5,6)
>>>s
(1,2,3,4,5,6)

The tuple has changed.

I thought I read that tuples are sequences (like lists), but they are
immutable - They can't be changed once created. Could someone explain
please ?
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