Understanding Python List operation

Question

I am new to python. i am learning some basic stuff. I was doing some operation on python list like this three_lists=[]*3 when i execute this piece of code it gives me only one empty list like this[]. Why it is not giving me 3 empty list? some what like this [],[],[]

Answer 1

It says right in the Python docs

s * n or n * s equivalent to adding s to itself n times

where s is a sequence and n is an int. For example

>>> [1,2,3]*3
[1, 2, 3, 1, 2, 3, 1, 2, 3]

This is consistent with other sequences as well, such as str

>>> 'hello'*3
'hellohellohello'

If you wanted a list of 3 empty lists you could say

>>> [[] for _ in range(3)]
[[], [], []]