Update Environment Variable for Azure function APP in Python

Question

When I deployed the Azure function, I set the environment variables. Is there a way to change the value while the function is running?

For example:

I have a variable called fetched = false, and inside the function, after I fetched the data, is there any logic in the code I could use to update the environment variable fetched to true?

Answer 1

Hello : @Xiuyang Bobby Sun Unfortunately, you cannot change the environment variables while the function is running. Environment variables are set when the function app starts up and are read-only during the lifetime of the function app.

If you need to store data that can be updated during the lifetime of the function app, you can use other storage options such as Azure Blob Storage, Azure Table Storage, or Azure Cosmos DB.

For your specific use case, you could use a flag or a variable to keep track of whether the data has been fetched or not, and update that variable accordingly.

For example, you could use a boolean variable called fetched and set it to False initially. Once you fetch the data, you can set fetched to True. Here's an example:

import os
fetched = False 
def main(req): global fetched 
if not fetched: 
	# fetch data 
	fetched = True 
else: # data has already been fetched 
	pass

This way, you can keep track of whether the data has been fetched or not without relying on environment variables.

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