Gunicorn not compatible with Python > 3.10

Question

Whenever I deploy on WebApp, I get this trace.

2023-01-18T23:47:37.542017057Z Traceback (most recent call last):
2023-01-18T23:47:37.542841660Z File "/tmp/8daf9ad5ac482f6/antenv/bin/gunicorn", line 5, in
2023-01-18T23:47:37.543544762Z from gunicorn.app.wsgiapp import run
2023-01-18T23:47:37.543562662Z File "/tmp/8daf9ad5ac482f6/antenv/lib/python3.10/site-packages/gunicorn/app/wsgiapp.py", line 9, in
2023-01-18T23:47:37.543843363Z from gunicorn.app.base import Application
2023-01-18T23:47:37.544277564Z File "/tmp/8daf9ad5ac482f6/antenv/lib/python3.10/site-packages/gunicorn/app/base.py", line 11, in
2023-01-18T23:47:37.544686265Z from gunicorn import util
2023-01-18T23:47:37.544729466Z File "/tmp/8daf9ad5ac482f6/antenv/lib/python3.10/site-packages/gunicorn/util.py", line 25, in
2023-01-18T23:47:37.552215989Z import pkg_resources
2023-01-18T23:47:37.552802890Z File "/tmp/8daf9ad5ac482f6/antenv/lib/python3.10/site-packages/pkg_resources/init.py", line 23, in
2023-01-18T23:47:37.553468492Z import zipfile
2023-01-18T23:47:37.553485692Z File "/opt/python/3.10.4/lib/python3.10/zipfile.py", line 19, in
2023-01-18T23:47:37.563566023Z import pathlib
2023-01-18T23:47:37.563587723Z File "/tmp/8daf9ad5ac482f6/antenv/lib/python3.10/site-packages/pathlib.py", line 10, in
2023-01-18T23:47:37.563593823Z from collections import Sequence
2023-01-18T23:47:37.563597723Z ImportError: cannot import name 'Sequence' from 'collections' (/opt/python/3.10.4/lib/python3.10/collections/init.py)

Seems like Python 3.10 is not compatible?

Answer 1

Hi, thank you for your question at Q&A. I understand that you want to run an Azure WebApp with Python 3.10 and are having issues importing gunicorn.

On the PyPi page for gunicorn the Python versions listed for the current 20.1.0 version of gunicorn are 3.5, 3.6, 3.7, 3.8 and 3.9. So Python 3.10 is currently not listed as a compatible version.

Answer 2

@Jason Wong it's compatible. I was successfully able to run a Python 3.10.0 app on Azure using gunicorn. I did have the same issue you had but was able to resolve it by using collection.abc instead of collection.

from collections.abc import Sequence
from flask import Flask

def is_it_a_sequence(obj):
    return isinstance(obj, Sequence)

print(is_it_a_sequence([1, 2, 3])) # True
print(is_it_a_sequence('abc')) # True

Since my Python project is a Visual Studio Python template project, my startup command for my app service is gunicorn --bind=0.0.0.0 --timeout 600 runserver:app with runtime configured as 3.10.

Answer 3

Hi I am having this issue when deploying a flask app to an App Service - the github actions build is fine and it deploys, but I see the same error logs in azure console.

Ryan I feel like your solution is only if I am importing Sequences in my own code, which i'm not. Is there a solution for this?

Thanks

  Warning
2023-11-11T20:33:35.8867203
During handling of the above exception, another exception occurred:
  Ok
2023-11-11T20:33:35.8867241
  Ok
2023-11-11T20:33:35.8867276
Traceback (most recent call last):
  Ok
2023-11-11T20:33:35.8867313
  File "/tmp/8dbe2f1b508822a/antenv/bin/gunicorn", line 5, in <module>
  Ok
2023-11-11T20:33:35.8949483
    from gunicorn.app.wsgiapp import run
  Ok
2023-11-11T20:33:35.8949715
  File "/tmp/8dbe2f1b508822a/antenv/lib/python3.11/site-packages/gunicorn/app/wsgiapp.py", line 9, in <module>
  Ok
2023-11-11T20:33:35.8949773
    from gunicorn.app.base import Application
  Ok
2023-11-11T20:33:35.894981
  File "/tmp/8dbe2f1b508822a/antenv/lib/python3.11/site-packages/gunicorn/app/base.py", line 11, in <module>
  Ok
2023-11-11T20:33:35.8949848
    from gunicorn import util
  Ok
2023-11-11T20:33:35.8949882
  File "/tmp/8dbe2f1b508822a/antenv/lib/python3.11/site-packages/gunicorn/util.py", line 28, in <module>
  Ok
2023-11-11T20:33:35.8964016
    import importlib_metadata
  Ok
2023-11-11T20:33:35.8964201
  File "/tmp/8dbe2f1b508822a/antenv/lib/python3.11/site-packages/importlib_metadata/__init__.py", line 6, in <module>
  Ok
2023-11-11T20:33:35.8964258
    import zipp
  Ok
2023-11-11T20:33:35.8964296
  File "/tmp/8dbe2f1b508822a/antenv/lib/python3.11/site-packages/zipp/__init__.py", line 3, in <module>
  Ok
2023-11-11T20:33:35.8964336
    import zipfile
  Ok
2023-11-11T20:33:35.8964377
  File "/opt/python/3.11.4/lib/python3.11/zipfile.py", line 19, in <module>
  Ok
2023-11-11T20:33:35.8978545
    import pathlib
  Ok
2023-11-11T20:33:35.8978744
  File "/tmp/8dbe2f1b508822a/antenv/lib/python3.11/site-packages/pathlib.py", line 10, in <module>
  Ok
2023-11-11T20:33:35.8978807
    from collections import Sequence
  Ok
2023-11-11T20:33:35.8978848
ImportError: cannot import name 'Sequence' from 'collections' (/opt/python/3.11.4/lib/python3.11/collections/__init__.py)