Deployment Issue on Azure: ImportError 'cannot import name Sequence from collections'

Question

Facing a deployment issue in Azure App Service with the following error message:

ImportError: cannot import name 'Sequence' from 'collections' (/opt/python/3.11.11/lib/python3.11/collections/__init__.py)

The error occurs during the import process in the gunicorn package, specifically in the following file paths:

• /tmp/8dd756461d24190/antenv/lib/python3.11/site-packages/gunicorn/app/base.py
• /tmp/8dd756461d24190/antenv/lib/python3.11/site-packages/gunicorn/util.py
• /tmp/8dd756461d24190/antenv/lib/python3.11/site-packages/importlib_metadata/__init__.py
• /tmp/8dd756461d24190/antenv/lib/python3.11/site-packages/pathlib.py

For reference, the deployment logs are available here: Log Files.

What steps can be taken to resolve this import error in the deployment process?

Answer 1

Hi Utkarsh Tiwari ,
This error usually occurs when the code (or depends on your project) tries to import sequence directly from the collection module, this:

from Collection from import sequence

However, in the Python 3.10 and the subsequent version, the sequence has been taken to the collects.abc module. So, the correct imports should now be:

from  Collects.abc import sequence

This change affects many third-party packages that would not have been updated to support new python versions.

In your case, stack trace shows that the issue is happening within gunicorn and possibly other dependence such as Importlib_Metadata. This usually means that your project is not compatible with one or more package pythan 3.11, which is a version running on your Azure App Service Environment.

Ensure that your requirements. TXT file specifies the compatible versions of your dependence that supports Python 3.11.

Before deploying in Azure, to ensure that a python 3.11 tested your application locally in the atmosphere to ensure that this problem is solved.

Once changes are made and tested, re -prepare your application on Azure.

https://learn.microsoft.com/en-us/azure/azure-functions/recover-python-functions?tabs=vscode%2Cbash&pivots=python-mode-decorators#troubleshoot-modulenotfounderror
https://learn.microsoft.com/en-us/azure/azure-functions/recover-python-functions?tabs=vscode%2Cbash&pivots=python-mode-decorators#troubleshoot-modulenotfounderror

if you have any further concerns or queries, please feel free to reach out to us.