Add example showing how to use Delta Lake with Python Azure Functions

[MrPowers]

Description

A user messaged me and said it would be helpful to have documentation on how to use Delta Lake in Python Azure Functions.

It would be helpful to have a docs page that explains this setup.

[rtyler]

@MrPowers I am not familiar with Azure Functions too much,. what is unique about the environment as opposed to a "standard" Python environment?

Is it a question about automatically picking up the authentication from the environment similar to how in AWS a Lambda's execution role can be used for S3 access?

[ArthurSteijn]

@rtyler, @MrPowers I don't think there is something different for an Azure Function App setup. Would this repo help? https://github.com/ArthurSteijn/azure-function-python-delta-upsert