Support for Python 3.13

[pykong]

Describe the request: A clear and concise description. Well, make Azure Functions compatible with Python 3.13 :)

Also, see #1397

[Goldziher]

please do. we are still waiting for 3.12, so it would be good if this is on your radar as well.

[stevesimmons]

@hallvictoria Now that Python 3.12 support is done (#1397, thank you!), please can you indicate the target date for supporting Python 3.13?

[hallvictoria]

@stevesimmons we are currently targeting this March.

[TJKlein]

@stevesimmons we are currently targeting this March.

@hallvictoria : Any update on this?

[hallvictoria]

We've hit some delays, and our updated preview target date is now May - June.

[polys]

@hallvictoria Please, don't take this as criticism because I really do appreciate all the work done on Azure Functions, but could you explain why adding support for new Python versions is so difficult? This doesn't seem to be an issue with .NET, Node.js, etc. It would be really helpful to understand any drawbacks with using Python on Azure Functions, just so we can make better decisions on language choice going forward.

[hallvictoria]

Hi @polys, supporting a new Python version involves updating multiple components of our product, many of which depend on each other. These components have to be released in a specific order, and each follows its own schedule and can take a month+ to fully rollout. Even if our main worker code is ready on time, any delays or urgent fixes in other parts can hold up the overall release.

We completely understand how important it is to have access to the latest language versions, and we apologize for any inconvenience this delay may cause. We do prioritize this work, and our team is actively exploring ways to streamline the process and reduce wait times in the future.

Thanks for your patience and for continuing to share your feedback—it helps us improve.

[guimatheus92]

Any news on this one?

[hallvictoria]

@guimatheus92 we are targeting mid-June for preview.

[hallvictoria]

Hi all, posting a quick update. The changes for supporting Python 3.13 have been completed, and they will be included in the 4.1040 runtime release. That release cycle has hit some delays, and it is now currently expected to reach all regions by mid to late July.

Thanks for your patience, and I'll post more updates here as the release progresses.

[hallvictoria]

Hey everyone, here are some updates for what's currently supported for Python 3.13:

Supported App Service Plans:

• Linux Dedicated
• Flex Consumption

Creating new 3.13 apps:

• Available via the Portal

Deployment mechanisms:

• Zip Deployment

Updating existing apps to Python 3.13:

• Linux Dedicated: Updating the LinuxFxVersion setting
• FlexConsumption: Changing Python Version via the Configuration tab in the portal

Pending:

• Linux Consumption plan support
• Core Tools support
  • Deployment (eg: func azure functionapp publish)
  • Local development (eg: func start)

[hallvictoria]

Core Tools version 4.0.7512 now supports Python 3.13. You can develop Python 3.13 functions locally using func start and deploy using func azure functionapp publish.

[chopeen]

Is the Docker image for Python 3.13 coming soon too? https://mcr.microsoft.com/en-us/artifact/mar/azure-functions/python/about

[gavin-aguiar]

@chopeen the python 3.13 docker image should be released by next week.

[sparkiegeek-slam]

@chopeen the python 3.13 docker image should be released by next week.

@gavin-aguiar Is it still planned to release this week? I note that https://mcr.microsoft.com/en-us/artifact/mar/azure-functions/python/about was published today but no sign of 3.13...

[hallvictoria]

We're still checking why that's not being updated. In the meantime, we do have 3.13 specific tags that can be used.

Here are the latest:

• Consumption: 4.1041.200-0-python3.13 (Full Tag List)
• Premium / Dedicated: 4-python3.13-appservice (Full Tag List)

[kaldren]

When I'm provisioning a Function App with Python using the Azure Portal, I see 3.13 (Preview) under versions. When is the preview part expected to become generally available (GA)?

[sparkiegeek-slam]

We're still checking why that's not being updated. In the meantime, we do have 3.13 specific tags that can be used.

Here are the latest:

• Consumption: 4.1041.200-0-python3.13 (Full Tag List)
• Premium / Dedicated: 4-python3.13-appservice ([Full Tag List](

Looks like the URL got butchered - here it is raw.

https://mcr.microsoft.com/v2/azure-functions/python/tags/list

[pykong]

Are there any updates on the Python 3.13 release?

[polys]

I've been trying this on Flex Consumption without much luck :( It looks like the app doesn't have access to its configuration (i.e. environment variables in the Portal)

Here's an example function_app.py that returns all environment variables.

On Python 3.12, it returns my custom environment variables just fine. On Python 3.13 nothing's there.

import json
import os
from platform import python_version

import azure.functions as func

app = func.FunctionApp(http_auth_level=func.AuthLevel.ANONYMOUS)


@app.route(route="http_trigger")
def http_trigger(req: func.HttpRequest) -> func.HttpResponse:
    return func.HttpResponse(
        json.dumps(
            {
                "python": python_version(),
                "environ": {k: v for k, v in sorted(os.environ.items())},
            },
            indent=2,
            ensure_ascii=False,
        ),
        mimetype="application/json",
    )

[RodriGoncaDeeployer]

Just tried to use the new Docker image for Python 3.13 with no luck. At least locally it does not recognize the function and no clear explanations on the logs.

Haven't tried to deploy in our dev env yet.

[hallvictoria]

Updates:

• Consumption support EDIT: Python 3.13 will not be supported on Linux Consumption. It's only supported on Flex Consumption, Premium, and Dedicated plans. So sorry for any confusion over this!
• Docker image: python:4-python3.13 is available - doc updates to Microsoft Artifact Registry have been merged and will be visible by end of the week / early next week
  • docker pull mcr.microsoft.com/azure-functions/python:4-python3.13
• Preview status: 3.13 is currently in preview - I'll link a doc here later with more explanation of some of the new features and changes introduced with 3.13
• GA timeline: ETA is end of September

If you're facing any specific problems, please open up a separate GH issue, and we'll follow up there

[polys]

• Consumption support EDIT: Python 3.13 will not be supported on Linux Consumption. It's only supported on Flex Consumption, Premium, and Dedicated plans. So sorry for any confusion over this!

As long as maximum instance count cannot be set to 1 (or less than 40), Flex Consumption is not a viable replacement for Linux Consumption for a lot of workloads out there. That affects Python more than any other supported language because Windows Consumption is not an option.

I understand not wanting to keep 'legacy' around forever, but it would be good to understand if and when some of Flex's known issues will be addressed if it's going to be the only option going forward.

Thanks!

[cmcconomyfwig]

Updates:

• Consumption support EDIT: Python 3.13 will not be supported on Linux Consumption. It's only supported on Flex Consumption, Premium, and Dedicated plans. So sorry for any confusion over this!

• Docker image: python:4-python3.13 is available - doc updates to Microsoft Artifact Registry have been merged and will be visible by end of the week / early next week

  • docker pull mcr.microsoft.com/azure-functions/python:4-python3.13

• Preview status: 3.13 is currently in preview - I'll link a doc here later with more explanation of some of the new features and changes introduced with 3.13

• GA timeline: ETA is end of September

If you're facing any specific problems, please open up a separate GH issue, and we'll follow up there

Hi Victoria,

As we approach the date, is 3.13 GA still on track for end of september?

[hallvictoria]

Hi @cmcconomyfwig, we are still targeting end of September / early October for GA.

[cmcconomyfwig]

Hi @cmcconomyfwig, we are still targeting end of September / early October for GA.

Hi @hallvictoria -- how are things looking for 3.13?

[hallvictoria]

Python 3.13 is GA!

You may still see the preview tag when creating new python 3.13 apps through the portal, but this will be removed soon and can be ignored.

[RodriGoncaDeeployer]

I think I found a bug introduced on this release: BUG #1797