I make web applications using Ruby on Rails as my backend. I use React and Flux on the frontend, which is JavaScript. I can fully use the debugging tools I need. I simply add the line of code "debugger" anywhere in my app, so that execution stops there. I use byebug gem in Rails. When the "debugger" line of code is executed on backend code, the debugging happens on the command line; when it happens in JavaScript code, the debugging happens in Chrome Dev Tools. In other words, I can work very quickly to debug.
What is the equivalent convenient debugging tool in Python? In other words, what should a person who can already program in general, and just wants to rapidly be able to debug in Python use? I am using Atom editor (like I use when I am making a web app).