Why does it change ALL the 3rd elements in the list?

Question

https://code.sololearn.com/cSJFvZo6ntPQ/?ref=app

Answer 1

I also don't fully understand what your plan is, but I'll make a guess about the problem.

gameboard = [snsa for i in range(inputt)]

That line puts the list snsa into gameboard. Not a copy of the list, but THE list.

snsa is like an adress card to the actual list, and when you access it, you actually say: 'Please go to the list snsa.'

So when you change one, you'll change them all - because in reality it is only ONE list.

What you need to do instead:

Fill your board with *copies* of snsa.

Quickest way to do it:

gameboard = [snsa[:] for i in range(inputt)]

Answer 2

You can easily check if some objects have the same references/addresses by printing the ids.
Like

print(id(gameboard))

Useful for debugging.

Answer 3

Thanks HonFu Youre awesome! That's exactly what I needed!

Answer 4

Hello Blabla Blablabla
Can you explain what you are trying to achieve?
Maybe it helps to add an example with input and expected output.

Answer 5

It's an issue that will accompany you for a long time, especially in Python.

Even after practicing for about two years, this happens to me (although I foresee (rather dread) it more often).

Whenever something freaky happens in one of my codes, first thing I ask myself:

Alright, where do I have reference trouble? Where am I accessing the very same item instead of copying?