Question on list in python. Why this output?

Question

A = [ [ ] ] * 3
A[0]. append(3)
print(A)
Why it prints [[3],[3],[3]] and why not [[3], [ ], [ ] ]

Answer 1

Because when using times 3,
it copies the reference to the empty list

So A == [[], [], []]
but A[0] == A[1] == A[2]

So when you change any one, the same is reflected in the other two, because they are referencing the same list.

https://code.sololearn.com/cDNDoUBxcniR/?ref=app