Capture input without return

I'm looking for a way to capture keys without requiring the enter key. An example of this would be the functionality of the [readchar module](https://pypi.org/project/readchar/) which I use on macOS.

However, I haven't been able to find anything that works in a-Shell. They either are not pure python and don't install (like readchar), or fail on execution because they don't understand the terminal or something in the system environment.

Is there a way to do this? I use this functionality to do vi-like scrolling. If I could detect the arrow keys, that would be a workaround.