There may be a bug or vulnerability in the assignment of a List here

[KiloMaster]

Bug report

Bug description:

Here is the case ; when i assign value to list， things is out of my control.
when i just assign value to a[2][1]， Assignment of list happend on other index.
I don't know if the design is like this or if there are bugs or vulnerabilities here.

In China, my email cannot be reached security@python.com. If there are security issues, please help me contact and forward relevant information to the security team.

# Add a code block here, if required
import sys
print(sys.version)
#3.6.8 (default, Nov 14 2023, 16:29:52)
#[GCC 4.8.5 20150623 (Red Hat 4.8.5-44)]
a=[[0,0]]*6
print(a)
#[[0, 0], [0, 0], [0, 0], [0, 0], [0, 0], [0, 0]]
a[1]=[1,1]
print(a)
#[[0, 0], [1, 1], [0, 0], [0, 0], [0, 0], [0, 0]]
a[2][1]=2
print(a)
#[[0, 2], [1, 1], [0, 2], [0, 2], [0, 2], [0, 2]]

CPython versions tested on:

3.8

Operating systems tested on:

Linux

[Eclips4]

Hello!
This is intended behavior, see https://docs.python.org/3/faq/programming.html#how-do-i-create-a-multidimensional-list for more information.