Python - Why is the output None when the extend() method is placed inside print()?

Question

x = [1,2,3]
x.extend([4,5,6])
print(x) # outputs [1, 2, 3, 4, 5, 6]

x = [1,2,3]
print(x.extend([4,5,6])) # outputs None
--> Why does this NOT output [1, 2, 3, 4, 5, 6]?

Answer 1

extend is a method that doesn't return anything. It operates "in place" so it changes the list.

Answer 2

The function <list>.extend() doesn't return a value.
The function just extends the list.