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I have a function app (python) in the azure portal which is in python version 3.7. The FUNCTIONS_EXTENSION_VERSION of the function app is ~3. When I deploy the function python) from VS code to update the function in the portal, I'm able to deploy and the update is reflected in the azure portal.

But when I change the python version to 3.9 and update FUNCTIONS_EXTENSION_VERSION to ~4 in the Azure portal and try to deploy the function(python) from VS code to update the function in the portal, deployment failed with error "deployer = ms-azuretools-vscode deploymentPath = Functions App ZipDeploy. Extract zip. Remote build."

The deployment is failing only after upgrading to version 3.9.

Could anyone please help me to understand why am I getting this error and how can we fix this?

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  • have you tried with py3.8? Commented Nov 25, 2022 at 12:44

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To upgrade the Python Version 3.7 to 3.9

Step 1: Update FUNCTIONS_EXTENSION_VERSION to 4 and Python version of Azure Function App in the Portal using the cmdlet:

az functionapp config set --name krishpyfunapp37to39 --resource-group HariTestRG --linux-fx-version "PYTHON|3.9"

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Make Sure Runtime Version is 4 in the General Settings of the Azure Function App Configuration Menu.

Step 2:

Select the Python Interpreter as 3.9.x version in your Azure Functions Project using the VS Code IDE: (Ctrl + Shift + P and Type as "Python Interpreter")

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If the Virtual Environment is activated in the project, make sure you update the home path and version number in virtual environment folder of the project:

home = C:\Users\Hari\AppData\Local\Programs\Python\Python39
include-system-site-packages = false
version = 3.9.13

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Note: Update the code and packages that matches the Python version 3.9.x when upgrading/downgrading > Test and then deploy. So that, it will not break the code due to changes.

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Refer to this MS Doc for steps on migrating the Azure Functions versions 3.x to 4.x and Python Versions.

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