Lists question

Question

Can someone please explain why the answer here is True False?

Original question:
“List1 = [1, 2]
List2 = List1
List3 = List2[:]
a=List2 is List1
b=List3 is List1”

I added print statements:
print(List1)
print(List2)
print(List3)
and they all were printed as [1, 2] so I am a bit confused.

Answer 1

list1 is actually a pointer to the list
list 2 is assigned the same pointer, it points to the same array
when you do [:] the interpreter is ready to take some sublist and because the indices are omitted it copies the whole list (you again get a pointer)
so list1 is list2
but list3 is not list1, they just have same content