func start with python function '_SixMetaPathImporter' object has no attribute '_path'

[es-cs1]

Version

windows 11

$ func start
Found Python version 3.12.0 (py).

Azure Functions Core Tools
Core Tools Version: 4.0.7030 Commit hash: N/A +bb4c949899cd5659d6bfe8b92cc923453a2e8f88 (64-bit)
Function Runtime Version: 4.1037.0.23568

Description

fulloutput trying to start

$ func start
Found Python version 3.12.0 (py).

Azure Functions Core Tools
Core Tools Version:       4.0.7030 Commit hash: N/A +bb4c949899cd5659d6bfe8b92cc923453a2e8f88 (64-bit)
Function Runtime Version: 4.1037.0.23568

[2025-05-22T22:09:54.586Z]  ERROR: unhandled error in functions worker: '_SixMetaPathImporter' object has no attribute '_path'
[2025-05-22T22:09:54.634Z] Language Worker Process exited. Pid=7708.
[2025-05-22T22:09:54.636Z] py exited with code 1 (0x1). AttributeError: '_SixMetaPathImporter' object has no attribute '_path',AttributeError: '_SixMetaPathImporter' object has no attribute '_path',AttributeError: '_SixMetaPathImporter' object has no attribute '_path'.
[2025-05-22T22:10:52.094Z] Starting worker process failed
[2025-05-22T22:10:52.096Z] Microsoft.Azure.WebJobs.Script.Grpc: The operation has timed out.
[2025-05-22T22:10:52.099Z] Failed to start language worker process for runtime: python. workerId:99ec6883-5dfc-4404-8642-49659190d41e
[2025-05-22T22:10:52.101Z] Removing errored webhost language worker channel for runtime: python workerId:99ec6883-5dfc-4404-8642-49659190d41e
[2025-05-22T22:10:52.102Z] Microsoft.Azure.WebJobs.Script.Grpc: The operation has timed out.
[2025-05-22T22:10:52.595Z] Traceback (most recent call last):
[2025-05-22T22:10:52.596Z]   File "C:\Program Files\Microsoft\Azure Functions Core Tools\workers\python\3.12\WINDOWS\X64\azure_functions_worker\main.py", line 61, in main
[2025-05-22T22:10:52.597Z]     return asyncio.run(start_async(
[2025-05-22T22:10:52.599Z]            ^^^^^^^^^^^^^^^^^^^^^^^^
[2025-05-22T22:10:52.600Z]   File "C:\<PATH>AppData\Local\Programs\Python\Python312\Lib\asyncio\runners.py", line 194, in run
[2025-05-22T22:10:52.602Z]     return runner.run(main)
[2025-05-22T22:10:52.603Z]            ^^^^^^^^^^^^^^^^
[2025-05-22T22:10:52.605Z]   File "C:\<PATH>AppData\Local\Programs\Python\Python312\Lib\asyncio\runners.py", line 118, in run
[2025-05-22T22:10:52.606Z]     return self._loop.run_until_complete(task)
[2025-05-22T22:10:52.607Z]            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[2025-05-22T22:10:52.608Z]   File "C:\<PATH>AppData\Local\Programs\Python\Python312\Lib\asyncio\base_events.py", line 664, in run_until_complete
[2025-05-22T22:10:52.609Z]     return future.result()
[2025-05-22T22:10:52.611Z]            ^^^^^^^^^^^^^^^
[2025-05-22T22:10:52.612Z]   File "C:\Program Files\Microsoft\Azure Functions Core Tools\workers\python\3.12\WINDOWS\X64\azure_functions_worker\main.py", line 71, in start_async
[2025-05-22T22:10:52.613Z]     from . import dispatcher
[2025-05-22T22:10:52.614Z]   File "C:\Program Files\Microsoft\Azure Functions Core Tools\workers\python\3.12\WINDOWS\X64\azure_functions_worker\dispatcher.py", line 23, in <module>
[2025-05-22T22:10:52.615Z]     from . import bindings, constants, functions, loader, protos
[2025-05-22T22:10:52.616Z]   File "C:\Program Files\Microsoft\Azure Functions Core Tools\workers\python\3.12\WINDOWS\X64\azure_functions_worker\loader.py", line 183, in <module>
[2025-05-22T22:10:52.618Z]     f'Sys Path: {sys.path}, Sys Module: {sys.modules},'
[2025-05-22T22:10:52.620Z]                                         ^^^^^^^^^^^^^
[2025-05-22T22:10:52.621Z]   File "<frozen importlib._bootstrap>", line 545, in _module_repr
[2025-05-22T22:10:52.622Z]   File "<frozen importlib._bootstrap>", line 830, in _module_repr_from_spec
[2025-05-22T22:10:52.623Z] AttributeError: '_SixMetaPathImporter' object has no attribute '_path'
[2025-05-22T22:10:52.624Z] Traceback (most recent call last):
[2025-05-22T22:10:52.625Z]   File "C:\Program Files\Microsoft\Azure Functions Core Tools\workers\python\3.12\WINDOWS\X64\azure_functions_worker\main.py", line 61, in main
[2025-05-22T22:10:52.627Z]     return asyncio.run(start_async(
[2025-05-22T22:10:52.628Z]            ^^^^^^^^^^^^^^^^^^^^^^^^
[2025-05-22T22:10:52.629Z]   File "C:\<PATH>AppData\Local\Programs\Python\Python312\Lib\asyncio\runners.py", line 194, in run
[2025-05-22T22:10:52.630Z]     return runner.run(main)
[2025-05-22T22:10:52.631Z]            ^^^^^^^^^^^^^^^^
[2025-05-22T22:10:52.632Z]   File "C:\<PATH>AppData\Local\Programs\Python\Python312\Lib\asyncio\runners.py", line 118, in run
[2025-05-22T22:10:52.635Z]     return self._loop.run_until_complete(task)
[2025-05-22T22:10:52.636Z]            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[2025-05-22T22:10:52.638Z]   File "C:\<PATH>AppData\Local\Programs\Python\Python312\Lib\asyncio\base_events.py", line 664, in run_until_complete
[2025-05-22T22:10:52.639Z]     return future.result()
[2025-05-22T22:10:52.640Z]            ^^^^^^^^^^^^^^^
[2025-05-22T22:10:52.641Z]   File "C:\Program Files\Microsoft\Azure Functions Core Tools\workers\python\3.12\WINDOWS\X64\azure_functions_worker\main.py", line 71, in start_async
[2025-05-22T22:10:52.642Z]     from . import dispatcher
[2025-05-22T22:10:52.643Z]   File "C:\Program Files\Microsoft\Azure Functions Core Tools\workers\python\3.12\WINDOWS\X64\azure_functions_worker\dispatcher.py", line 23, in <module>
[2025-05-22T22:10:52.644Z]     from . import bindings, constants, functions, loader, protos
[2025-05-22T22:10:52.645Z]   File "C:\Program Files\Microsoft\Azure Functions Core Tools\workers\python\3.12\WINDOWS\X64\azure_functions_worker\loader.py", line 183, in <module>
[2025-05-22T22:10:52.646Z]     f'Sys Path: {sys.path}, Sys Module: {sys.modules},'
[2025-05-22T22:10:52.647Z]                                         ^^^^^^^^^^^^^
[2025-05-22T22:10:52.648Z]   File "<frozen importlib._bootstrap>", line 545, in _module_repr
[2025-05-22T22:10:52.649Z]   File "<frozen importlib._bootstrap>", line 830, in _module_repr_from_spec
[2025-05-22T22:10:52.650Z] AttributeError: '_SixMetaPathImporter' object has no attribute '_path'
[2025-05-22T22:10:52.652Z] Traceback (most recent call last):
[2025-05-22T22:10:52.653Z]   File "C:\Program Files\Microsoft\Azure Functions Core Tools\workers\python\3.12/WINDOWS/X64/worker.py", line 68, in <module>
[2025-05-22T22:10:52.654Z]     main.main()
[2025-05-22T22:10:52.656Z]   File "C:\Program Files\Microsoft\Azure Functions Core Tools\workers\python\3.12\WINDOWS\X64\azure_functions_worker\main.py", line 61, in main
[2025-05-22T22:10:52.657Z]     return asyncio.run(start_async(
[2025-05-22T22:10:52.659Z]            ^^^^^^^^^^^^^^^^^^^^^^^^
[2025-05-22T22:10:52.660Z]   File "C:\<PATH>AppData\Local\Programs\Python\Python312\Lib\asyncio\runners.py", line 194, in run
[2025-05-22T22:10:52.662Z]     return runner.run(main)
[2025-05-22T22:10:52.664Z]            ^^^^^^^^^^^^^^^^
[2025-05-22T22:10:52.665Z]   File "C:\<PATH>AppData\Local\Programs\Python\Python312\Lib\asyncio\runners.py", line 118, in run
[2025-05-22T22:10:52.667Z]     return self._loop.run_until_complete(task)
[2025-05-22T22:10:52.668Z]            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[2025-05-22T22:10:52.670Z]   File "C:\<PATH>AppData\Local\Programs\Python\Python312\Lib\asyncio\base_events.py", line 664, in run_until_complete
[2025-05-22T22:10:52.671Z]     return future.result()
[2025-05-22T22:10:52.672Z]            ^^^^^^^^^^^^^^^
[2025-05-22T22:10:52.673Z]   File "C:\Program Files\Microsoft\Azure Functions Core Tools\workers\python\3.12\WINDOWS\X64\azure_functions_worker\main.py", line 71, in start_async
[2025-05-22T22:10:52.674Z]     from . import dispatcher
[2025-05-22T22:10:52.675Z]   File "C:\Program Files\Microsoft\Azure Functions Core Tools\workers\python\3.12\WINDOWS\X64\azure_functions_worker\dispatcher.py", line 23, in <module>
[2025-05-22T22:10:52.676Z]     from . import bindings, constants, functions, loader, protos
[2025-05-22T22:10:52.677Z]   File "C:\Program Files\Microsoft\Azure Functions Core Tools\workers\python\3.12\WINDOWS\X64\azure_functions_worker\loader.py", line 183, in <module>
[2025-05-22T22:10:52.678Z]     f'Sys Path: {sys.path}, Sys Module: {sys.modules},'
[2025-05-22T22:10:52.679Z]                                         ^^^^^^^^^^^^^
[2025-05-22T22:10:52.680Z]   File "<frozen importlib._bootstrap>", line 545, in _module_repr
[2025-05-22T22:10:52.681Z]   File "<frozen importlib._bootstrap>", line 830, in _module_repr_from_spec
[2025-05-22T22:10:52.683Z] AttributeError: '_SixMetaPathImporter' object has no attribute '_path'
[2025-05-22T22:10:53.717Z]  ERROR: unhandled error in functions worker: '_SixMetaPathImporter' object has no attribute '_path'
[2025-05-22T22:10:53.720Z] Traceback (most recent call last):
[2025-05-22T22:10:53.722Z]   File "C:\Program Files\Microsoft\Azure Functions Core Tools\workers\python\3.12\WINDOWS\X64\azure_functions_worker\main.py", line 61, in main
[2025-05-22T22:10:53.724Z]     return asyncio.run(start_async(
[2025-05-22T22:10:53.725Z]            ^^^^^^^^^^^^^^^^^^^^^^^^
[2025-05-22T22:10:53.726Z]   File "C:\<PATH>AppData\Local\Programs\Python\Python312\Lib\asyncio\runners.py", line 194, in run
[2025-05-22T22:10:53.727Z]     return runner.run(main)
[2025-05-22T22:10:53.727Z]            ^^^^^^^^^^^^^^^^
[2025-05-22T22:10:53.728Z]   File "C:\<PATH>AppData\Local\Programs\Python\Python312\Lib\asyncio\runners.py", line 118, in run
[2025-05-22T22:10:53.729Z]     return self._loop.run_until_complete(task)
[2025-05-22T22:10:53.730Z]            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[2025-05-22T22:10:53.731Z]   File "C:\<PATH>AppData\Local\Programs\Python\Python312\Lib\asyncio\base_events.py", line 664, in run_until_complete
[2025-05-22T22:10:53.731Z]     return future.result()
[2025-05-22T22:10:53.733Z]            ^^^^^^^^^^^^^^^
[2025-05-22T22:10:53.736Z]   File "C:\Program Files\Microsoft\Azure Functions Core Tools\workers\python\3.12\WINDOWS\X64\azure_functions_worker\main.py", line 71, in start_async
[2025-05-22T22:10:53.738Z]     from . import dispatcher
[2025-05-22T22:10:53.738Z]   File "C:\Program Files\Microsoft\Azure Functions Core Tools\workers\python\3.12\WINDOWS\X64\azure_functions_worker\dispatcher.py", line 23, in <module>
[2025-05-22T22:10:53.739Z]     from . import bindings, constants, functions, loader, protos
[2025-05-22T22:10:53.740Z]   File "C:\Program Files\Microsoft\Azure Functions Core Tools\workers\python\3.12\WINDOWS\X64\azure_functions_worker\loader.py", line 183, in <module>
[2025-05-22T22:10:53.741Z]     f'Sys Path: {sys.path}, Sys Module: {sys.modules},'
[2025-05-22T22:10:53.742Z]                                         ^^^^^^^^^^^^^
[2025-05-22T22:10:53.743Z]   File "<frozen importlib._bootstrap>", line 545, in _module_repr
[2025-05-22T22:10:53.743Z]   File "<frozen importlib._bootstrap>", line 830, in _module_repr_from_spec
[2025-05-22T22:10:53.744Z] AttributeError: '_SixMetaPathImporter' object has no attribute '_path'
[2025-05-22T22:10:53.745Z] Traceback (most recent call last):
[2025-05-22T22:10:53.746Z]   File "C:\Program Files\Microsoft\Azure Functions Core Tools\workers\python\3.12\WINDOWS\X64\azure_functions_worker\main.py", line 61, in main
[2025-05-22T22:10:53.747Z]     return asyncio.run(start_async(
[2025-05-22T22:10:53.748Z]            ^^^^^^^^^^^^^^^^^^^^^^^^
[2025-05-22T22:10:53.748Z]   File "C:\<PATH>AppData\Local\Programs\Python\Python312\Lib\asyncio\runners.py", line 194, in run
[2025-05-22T22:10:53.750Z]     return runner.run(main)
[2025-05-22T22:10:53.751Z]            ^^^^^^^^^^^^^^^^
[2025-05-22T22:10:53.753Z]   File "C:\<PATH>AppData\Local\Programs\Python\Python312\Lib\asyncio\runners.py", line 118, in run
[2025-05-22T22:10:53.755Z]     return self._loop.run_until_complete(task)
[2025-05-22T22:10:53.756Z]            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[2025-05-22T22:10:53.757Z]   File "C:\<PATH>AppData\Local\Programs\Python\Python312\Lib\asyncio\base_events.py", line 664, in run_until_complete
[2025-05-22T22:10:53.758Z]     return future.result()
[2025-05-22T22:10:53.759Z]            ^^^^^^^^^^^^^^^
[2025-05-22T22:10:53.760Z]   File "C:\Program Files\Microsoft\Azure Functions Core Tools\workers\python\3.12\WINDOWS\X64\azure_functions_worker\main.py", line 71, in start_async
[2025-05-22T22:10:53.761Z]     from . import dispatcher
[2025-05-22T22:10:53.762Z]   File "C:\Program Files\Microsoft\Azure Functions Core Tools\workers\python\3.12\WINDOWS\X64\azure_functions_worker\dispatcher.py", line 23, in <module>
[2025-05-22T22:10:53.764Z]     from . import bindings, constants, functions, loader, protos
[2025-05-22T22:10:53.765Z]   File "C:\Program Files\Microsoft\Azure Functions Core Tools\workers\python\3.12\WINDOWS\X64\azure_functions_worker\loader.py", line 183, in <module>
[2025-05-22T22:10:53.769Z]     f'Sys Path: {sys.path}, Sys Module: {sys.modules},'
[2025-05-22T22:10:53.771Z]                                         ^^^^^^^^^^^^^
[2025-05-22T22:10:53.773Z]   File "<frozen importlib._bootstrap>", line 545, in _module_repr
[2025-05-22T22:10:53.773Z] Language Worker Process exited. Pid=14332.
[2025-05-22T22:10:53.774Z]   File "<frozen importlib._bootstrap>", line 830, in _module_repr_from_spec
[2025-05-22T22:10:53.775Z] py exited with code 1 (0x1). AttributeError: '_SixMetaPathImporter' object has no attribute '_path',AttributeError: '_SixMetaPathImporter' object has no attribute '_path',AttributeError: '_SixMetaPathImporter' object has no attribute '_path'.
[2025-05-22T22:10:53.776Z] AttributeError: '_SixMetaPathImporter' object has no attribute '_path'
[2025-05-22T22:10:53.778Z] Traceback (most recent call last):
[2025-05-22T22:10:53.779Z]   File "C:\Program Files\Microsoft\Azure Functions Core Tools\workers\python\3.12/WINDOWS/X64/worker.py", line 68, in <module>
[2025-05-22T22:10:53.780Z]     main.main()
[2025-05-22T22:10:53.781Z]   File "C:\Program Files\Microsoft\Azure Functions Core Tools\workers\python\3.12\WINDOWS\X64\azure_functions_worker\main.py", line 61, in main
[2025-05-22T22:10:53.782Z]     return asyncio.run(start_async(
[2025-05-22T22:10:53.784Z]            ^^^^^^^^^^^^^^^^^^^^^^^^
[2025-05-22T22:10:53.786Z]   File "C:\<PATH>AppData\Local\Programs\Python\Python312\Lib\asyncio\runners.py", line 194, in run
[2025-05-22T22:10:53.788Z]     return runner.run(main)
[2025-05-22T22:10:53.790Z]            ^^^^^^^^^^^^^^^^
[2025-05-22T22:10:53.791Z]   File "C:\<PATH>AppData\Local\Programs\Python\Python312\Lib\asyncio\runners.py", line 118, in run
[2025-05-22T22:10:53.792Z] Exceeded language worker restart retry count for runtime:python. Shutting down and proactively recycling the Functions Host to recover
[2025-05-22T22:10:53.792Z]     return self._loop.run_until_complete(task)
[2025-05-22T22:10:53.794Z]            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[2025-05-22T22:10:53.795Z]   File "C:\<PATH>AppData\Local\Programs\Python\Python312\Lib\asyncio\base_events.py", line 664, in run_until_complete
[2025-05-22T22:10:53.796Z]     return future.result()
[2025-05-22T22:10:53.797Z]            ^^^^^^^^^^^^^^^
[2025-05-22T22:10:53.798Z]   File "C:\Program Files\Microsoft\Azure Functions Core Tools\workers\python\3.12\WINDOWS\X64\azure_functions_worker\main.py", line 71, in start_async
[2025-05-22T22:10:53.799Z]     from . import dispatcher
[2025-05-22T22:10:53.801Z]   File "C:\Program Files\Microsoft\Azure Functions Core Tools\workers\python\3.12\WINDOWS\X64\azure_functions_worker\dispatcher.py", line 23, in <module>
[2025-05-22T22:10:53.802Z]     from . import bindings, constants, functions, loader, protos
[2025-05-22T22:10:53.804Z]   File "C:\Program Files\Microsoft\Azure Functions Core Tools\workers\python\3.12\WINDOWS\X64\azure_functions_worker\loader.py", line 183, in <module>
[2025-05-22T22:10:53.805Z]     f'Sys Path: {sys.path}, Sys Module: {sys.modules},'
[2025-05-22T22:10:53.805Z]                                         ^^^^^^^^^^^^^
[2025-05-22T22:10:53.806Z]   File "<frozen importlib._bootstrap>", line 545, in _module_repr
[2025-05-22T22:10:53.807Z]   File "<frozen importlib._bootstrap>", line 830, in _module_repr_from_spec

Steps to reproduce

install python 3.12 on windows using local installation (no admin privilegs)

install latest func tools 4.0.7030 , using dotnet sdk 8.0

try and run

[es-cs1]

I downgraded from python 3.12.0 to python 3.11.9 and it worked

found from a comment inside this issue...
https://stackoverflow.com/questions/79297463/running-an-azure-function-locally-results-in-a-worker-error

[akozhikkot]

We can not use Python 3.11 due to issues with Cryptography module and the ADO build agent versions.

Is development on 3.12 not supported yet, looks like the 3.12 support is in GA on Azure Functions now

[akozhikkot]

An update on this, using the latest python 3.12 version seems to start up the functions correctly . 3.12.10

[es-cs1]

closing as since I upgraded to 3.12.10 which fixed it