Python changes are not reflected in a running app

Question

I've decided to make a simple Telegram Bot in order to learn a bit of Python. I have a main.py that imports and executes another file

#!/usr/bin/env python
import butlerr

if __name__ == '__main__':
    butlerr.main()

I run that file

> python src/main.py

But if I make a change in butlerr.py, that's not reflected in the running app. I imagine I won't see changes in a running app. It works if I stop the command and re-run it, obviously.

I figure that's probably not the way to develop. Is there a more seamless way to make changes and see them immediately? I saw a blog post where they create like a web server, but I think that doesn't work on my case.

I closed a question I previously made cause I thought it was a docker issue, but it was not.

It generally doesn't make sense to swap modules in a running process. The objects that were already created have obviously been created with the old version of a module, so they won't be compatible with a new version of the module. For example, butlerr.main() would have already been called and be running – the effect of swapping it with a new version would be undefined. — MisterMiyagi
– MisterMiyagi, Commented Jan 27, 2022 at 10:22
Can you look at this article, maybe it works for you; towardsdatascience.com/… — Ogün Birinci
– Ogün Birinci, Commented Jan 27, 2022 at 10:24
Then how's the development cycle? I mean, I want to code and then see the changes when talking to the bot. Right now, I have to make the change, stop the running process, re-run it, then talk to the bot again. (Sorry if the question is stupid, today's literally the first day I'm writing a line of python) — Jorge Anzola
– Jorge Anzola, Commented Jan 27, 2022 at 10:25

Mehrdad Khojastefar · Accepted Answer · 2022-01-27 10:25:15Z

1

What you are looking for is called hot-reloading. every famous python framework has the hot-reloading option ( so you can turn it on and off )

first check if your package has this feature or not.

Then if it did not have hot-reloading option, you can run your python app using this package

answered Jan 27, 2022 at 10:25

Mehrdad Khojastefar

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1 Comment

Jorge Anzola Over a year ago

That worked perfectly! Thank you very much. github.com/JorgeAnzola/butlerr/blob/master/Dockerfile#L11

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