Python detect changing (global) variable

Question

To make a somewhat long explanation rather simple for someone who's not fully into my project as me; I'm trying to find a way to detect a global variables that change in Python 2.7.

I'm trying to send updated to another device who registers them.

To reduce traffic and CPU load, instead of opting for a periodic update message, I was thinking of only sending an update message when a variable changes, and I might be tired right now but I don't know how I can detect a variable that changes.

Is there a library or something I can take advantage of?

Thank you!

Answer 1

You could use the Pub/Sub feature of Redis if this kind of behaviour is typical in your codebase. https://redis.io/topics/pubsub .
Every time your variable changes, you publish this event on a channel.
For example let's call the channel variableUpdates .
The devices that depend on your variable value subscribe to the channel variableUpdates .
Every time when your variable changes you publish this event on the channel variableUpdates .
When this happens, your listeners get notified of this event, read the new variable value and use it in their own context.