what happens inside?

[Chetan Harjani]

why tuples are immutable whereas list are mutable?
why when we do x=y where y is a list and then change a element in x, y
changes too( but the same is not the case when we change the whole value in
x ), whereas, in tuples when we change x, y is not affected and also we cant
change each individual element in tuple. Someone please clarify.

-- 
echo "Impossible" | cat > /dev/null
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