How to move actual turtlebot3 with python script?

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I don't have any experience with ROS, I want to make the actual turtle bot (not simulation )move left, right, forward, and backward with python code. I went through the turtlebot documentation, it controls the robot with a joystick or keyboard which is what I don't want. (my actual goal is to make the robot move towards /follow a specific object like a tennis ball). I did find a tutorial that accomplishes this task but it's not implemented on turtlebot. Here's the link (https://helloworld.co.in/article/ai-r...) Any help will be greatly appreciated. Thanks.