Pygame how to implement camera?

Question

pygame

I am new to python. The fact is that I am writing a game in Pygame, and I need to implement a camera that will move sprites and objects, and this is easy to do, but keep in mind that if the character is in the corner of the map, then the camera does not move beyond the corner of the last block. The map in my game consists of tiles. Link to GitHub, the code is huge.
https://github.com/Reviksedy/GetTheSandvich