Python worker.py Arm64 folder missing

[aarsan]

Version

I am attempting to install v 4.0.6821 of the Azure Functions Core Tools on my Surface Laptop, ARM 64 (Snapdragon), running Windows 11.

Description

When I attempt to install the Arm64 version (via zip), there is no Arm64 folder under:
workers\python\3.11. There are only x86 and x64 folders. When I try starting the function host, it throws an error saying it cannot find workers\python\3.11\Arm64\worker.py.

I tried creating an Arm64 folder and copying the files from the x64 folder there. Also tried the x86 folder. Neither worked. I feel like I am missing something obvious because in other posts, it says that Windows Arm64 has been supported for a while now (I downloaded the zip of it).

Please help.

Steps to reproduce

Attempt to run a function app on a Windows Arm64 using the win-arm release of azure functions core tools.

[aarsan]

I found a workaround:

In the worker.config.json file, it looks like this:
"defaultWorkerPath":"%FUNCTIONS_WORKER_RUNTIME_VERSION%/{os}/{architecture}/worker.py",

{architecture} picks up "Arm64". If I remove that variable and hardcode it to x64, it works - even though I'm on an Arm processor. If I try x86, it does not. No idea why this defaults to a location that does not exist.

[mattchenderson]

Depends on Azure/azure-functions-python-worker#1643

[sebastianmeyer-1]

Works not for me. Now I'm getting the following error:

[isaru66]

Apart from aarsan workarround.

My workarround is to create symbolic link.

cd to
C:\Program Files\Microsoft\Azure Functions Core Tools\workers\python\3.12\WINDOWS

Add symbolic link from Arm64 to X64 using the following powershell script.

New-Item -ItemType SymbolicLink -Path Arm64 -Target "C:\Program Files\Microsoft\Azure Functions Core Tools\workers\python\3.12\WINDOWS\X64"

This make func start working with X64 emulator.

---

Still waiting for native ARM64 support though...

[Molier]

is there any update on the arm64 version? why is there one in releases then? if it is not supported nor working? Azure.Functions.Cli.win-arm64.4.1.0.zip

[liliankasem]

For windows arm64, we do not have python support as this depends on the worker providing that: Azure/azure-functions-python-worker#1714

For linux arm64, we have a preview out and currentlywaiting on the latest host release to add python support: https://github.com/Azure/azure-functions-core-tools/releases/tag/4.0.7332-preview1

why is there one in releases then? if it is not supported nor working? Azure.Functions.Cli.win-arm64.4.1.0.zip

That package contains all languages, and not just python. win-arm64 is supported and working for other languages.