Repl.it now will sync your files in realtime. It even has a neat little cursor for when the system is giving you file updates 🤯
Try forking this repl, running it, and going to henlo.txt to see it in action:
@AllAwesome497 that is a bug. We're looking into it.
With regards to realtime file updates it does actually work in Python. Try this: https://repl.it/@amasad/realtime-python-updates