Boundaries in creating a game in python!

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Python

Im python I am creating a 2d game.

It is a maze game with different shapes of walls.

When I collide with the walls at the minute the user can go through them but I want to be able to block him from doing that. I want them to be solid!

How do i do this? Would i use an array? I have created an outside wall before in another game but that was just setting the bounds in the user class. There has to be an easier way with a number amount of walls.

The more help the better thanks.