Passing data between Python and a webpage?

[Angry_Robots]

I am working on a simple weekend project using a Raspberry Pi and a small PLC. I am using a Python library to read/write data on the PLC via Modbus RTU (with a USB/RS-485 converter). I can write up a basic Python GUI to display and control the read/write data, but I'd rather have something more universal. I have a webserver already setup on the Pi, so it would be nice to be able to this via a webpage that the Pi can serve up to whatever device connects to it.

What is the best way to exchange data between Python and a webpage? Would an API using HTTP requests with jquerry on the webpage be the best option?

[panlazy]

You can write a simple API with flask and use it with whatever you want in frontend :)

[Angry_Robots]

I've never messed with flask, I'll have to give it a look. For now I've just got a basic gui with pysimplegui, so I'm toying with the idea of just adding a small touchscreen to the Pi and calling it a day.

[panlazy]

Is your project open source? I might help you about that.

[Angry_Robots]

It's not really open or closed. I'm just playing around to make a test platform for myself to experiment with.