I kept wondering why the output is [[3,2],[3,2]]

Question

This code snippet why it keeps returning that out even though only index of [0][0]
a = [[1,2]] * 2
print(a)
a[0][0] = 3
print(a)

Answer 1

By multiplying the list, ur creating 2nd member which refers same memory location as 1st member. So, if you change the value of 1st members, u will seesame value in 2 nd member also.. .

U can cross check whether a[0][0] and a[1][0] referring to same memory location using id(a[0][0]) method. Same id value indicates that, they are referring to same memory location.

Answer 2

Thankx alot for clarifying this for me.
But is it similar to something like
a = b ??

Answer 3

Because they have the same reference. It doesn't kust create a new list with the elements [ 1, 2 ], but create a reference for it, which means a[0] and a[1] are pointing to the same list, so changing a[0][0] changes a[1][0]

Answer 4

Yes