So once a tuple is created with some values can it be extended?

Answer 1

Nope. Tuples are immutable. That means that after creating you can't change them anymore.

Answer 2

The only way to change a value in a tuple is to create a new tuple with the new value(s)

Answer 3

You cannot change a tuple because they are immutable but you can append it.

Answer 4

tup=(1,2,3)
tup+=(4,)
print (tup)
#(1,2,3,4)