ModuleNotFoundError in Azure Function App Deployment

Question

ModuleNotFoundError in Azure Function App Deployment

Amber Price 0

There is an issue when deploying a function app via GitHub CLI where the deployment appears to succeed, but it does not retain the packages specified in the requirements.txt file. Running the function app locally has no problems.

The setup includes an Azure Function App using a Flexible-Consumption plan with Python 3.10 in East US 2.

The error logged in Application Insights is:
Failure Exception: ModuleNotFoundError: No module named 'requests'.

Exception while executing function: Functions.Health Result: Failure
Exception: ModuleNotFoundError: No module named 'requests'. Cannot find module. Please check the requirements.txt file for the missing module. For more info, please refer the troubleshooting guide: https://aka.ms/functions-modulenotfound. Current sys.path: ['/tmp/functions\\standby\\wwwroot', '/home/site/wwwroot/.python_packages/lib/site-packages', '/azure-functions-host/workers/python/3.10/LINUX/X64', '/usr/local/lib/python310.zip', '/usr/local/lib/python3.10', '/usr/local/lib/python3.10/lib-dynload', '/usr/local/lib/python3.10/site-packages']
Stack:   File "/azure-functions-host/workers/python/3.10/LINUX/X64/azure_functions_worker/dispatcher.py", line 541, in _handle__function_load_request
    func = loader.load_function(
  File "/azure-functions-host/workers/python/3.10/LINUX/X64/azure_functions_worker/utils/wrappers.py", line 49, in call
    raise extend_exception_message(e, message)
  File "/azure-functions-host/workers/python/3.10/LINUX/X64/azure_functions_worker/utils/wrappers.py", line 44, in call
    return func(*args, **kwargs)
  File "/azure-functions-host/workers/python/3.10/LINUX/X64/azure_functions_worker/loader.py", line 220, in load_function
    mod = importlib.import_module(fullmodname)
  File "/usr/local/lib/python3.10/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "/home/site/wwwroot/Health/__init__.py", line 4, in <module>
    import requests

The requirements.txt file only contains the following entries:

azure-functions  
requests

The continuous deployment configuration is based on the YML generated by the deployment center. Attempts to perform a remote build resulted in another error:
Internal error: Expected value to be neither null nor undefined: newSiteName.

Various environment variables have been toggled with no success, including:

SCM_DO_BUILD_DURING_DEPLOYMENT = true
ENABLE_ORYX_BUILD = true
WEBSITE_RUN_FROM_PACKAGE = <some blob location>

Additionally, different Python versions and Ubuntu versions in the YML have been tested, and there have been attempts to force the creation of the .python_packages folder with installations managed through the YML. So the issue isn't the packages folder just missing.

An unexpected message was received from microsoft via the function app, which is displayed in the following image:
User's image

Previous suggested workarounds have been attempted and exhausted.

Further insights into why the deployment is losing the Python virtual environment created during zip deployment would be greatly appreciated.

RithwikBojja 1,455 Reputation points Microsoft External Staff

2025-04-03T04:30:39.2033333+00:00

Can you provide the code you have tried and also the steps you have used to deploy to Function App? Did you follow the workaround given in the error screen shot?
Amber Price 0 Reputation points

2025-04-03T16:36:19.41+00:00

I appreciate the comment.

The code is just the basic function app that you can create via Code.

Here is my github to the code, https://github.com/Ambyli/Test-API. I am using github actions, with a .yml file pre-generated, that was constructed directly from azure upon setting up the connection in the deployment center. So everything I have done is via the pre-made templates.

For your second question, I have followed the work arounds, they unfortunately gave me the exact same errors. For reference what I specifically tried was changing the ubuntu version as described in the message from microsoft. I am not using a cryptology package in the default template so that "work around" would have no relevant impact on the deployment on this app.

As I stated in my original question I have also tried toggling some environment variables that people have quoted to "fixing" the problem with no avail.

The strange thing is that I know the deployment works specifically in a dedicated service plan, but not in a flex-consumption or a simple consumption plan. I have successfully got it working in the dedicated service plan with no changes to my .yml or the environment in github. Unfortunately the cost for a dedicated does not warrant its usage in my use case.

So I ask next, what else can I try?
VenkateshDodda-MSFT 24,591 Reputation points Microsoft Employee

2025-04-08T11:19:06.06+00:00

@Amber Price Thanks for your patience on this.

I see in the above repo you are using GitHub actions (Source control) deployment to deploy your functions.

The strange thing is that I know the deployment works specifically in a dedicated service plan, but not in a flex-consumption or a simple consumption plan.

Currently, Source Control deployment method is available for windows-based consumption and higher plans as mentioned in the documentation here.

If you want to deploy your python functions in consumption, elastic premium plan using Run from package, please do follow the instructions mentioned here.

Also try upgrading the python runtime version to 3.11 and if you are facing the issue still would suggest you troubleshoot using various deployment detectors under the diagnose and solve problems of your function app.

Hope this helps, let me know if you have any further questions on this.
Amber Price 0 Reputation points

2025-04-08T18:37:32.59+00:00

@VenkateshDodda-MSFT I see so it is currently impossible to have source control to deploy properly on a linux machine under the two consumption options. Unfortunately with Python the only option was to use a linux machine. Also how come the deployment still states "success" in github's actions when it must truly not be?

I have previously attempted to do zip deployment but I kept encountering a different error that I don't remember at this moment. I will attempt to deploy once again using that method and respond back here if that solution works or respond back with a further dive into this other issue if I am remembering correctly.
VenkateshDodda-MSFT 24,591 Reputation points Microsoft Employee

2025-04-10T14:31:33.2633333+00:00

@Amber Price Thanks for your follow up questions on this and apologize for the delay in my response.

Sorry for the confusion I have created a consumption app and able to see configure the github actions in it. Also, have tried redeploying the function app still facing the issue.

Your answer

RithwikBojja 1,455 Reputation points Microsoft External Staff

2025-04-03T04:30:39.2033333+00:00

Can you provide the code you have tried and also the steps you have used to deploy to Function App? Did you follow the workaround given in the error screen shot?
Amber Price 0 Reputation points

2025-04-03T16:36:19.41+00:00

I appreciate the comment.

The code is just the basic function app that you can create via Code.

Here is my github to the code, https://github.com/Ambyli/Test-API. I am using github actions, with a .yml file pre-generated, that was constructed directly from azure upon setting up the connection in the deployment center. So everything I have done is via the pre-made templates.

For your second question, I have followed the work arounds, they unfortunately gave me the exact same errors. For reference what I specifically tried was changing the ubuntu version as described in the message from microsoft. I am not using a cryptology package in the default template so that "work around" would have no relevant impact on the deployment on this app.

As I stated in my original question I have also tried toggling some environment variables that people have quoted to "fixing" the problem with no avail.

The strange thing is that I know the deployment works specifically in a dedicated service plan, but not in a flex-consumption or a simple consumption plan. I have successfully got it working in the dedicated service plan with no changes to my .yml or the environment in github. Unfortunately the cost for a dedicated does not warrant its usage in my use case.

So I ask next, what else can I try?
VenkateshDodda-MSFT 24,591 Reputation points Microsoft Employee

2025-04-08T11:19:06.06+00:00

@Amber Price Thanks for your patience on this.

I see in the above repo you are using GitHub actions (Source control) deployment to deploy your functions.

The strange thing is that I know the deployment works specifically in a dedicated service plan, but not in a flex-consumption or a simple consumption plan.

Currently, Source Control deployment method is available for windows-based consumption and higher plans as mentioned in the documentation here.

If you want to deploy your python functions in consumption, elastic premium plan using Run from package, please do follow the instructions mentioned here.

Also try upgrading the python runtime version to 3.11 and if you are facing the issue still would suggest you troubleshoot using various deployment detectors under the diagnose and solve problems of your function app.

Hope this helps, let me know if you have any further questions on this.
Amber Price 0 Reputation points

2025-04-08T18:37:32.59+00:00

@VenkateshDodda-MSFT I see so it is currently impossible to have source control to deploy properly on a linux machine under the two consumption options. Unfortunately with Python the only option was to use a linux machine. Also how come the deployment still states "success" in github's actions when it must truly not be?

I have previously attempted to do zip deployment but I kept encountering a different error that I don't remember at this moment. I will attempt to deploy once again using that method and respond back here if that solution works or respond back with a further dive into this other issue if I am remembering correctly.
VenkateshDodda-MSFT 24,591 Reputation points Microsoft Employee

2025-04-10T14:31:33.2633333+00:00

@Amber Price Thanks for your follow up questions on this and apologize for the delay in my response.

Sorry for the confusion I have created a consumption app and able to see configure the github actions in it. Also, have tried redeploying the function app still facing the issue.

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ModuleNotFoundError in Azure Function App Deployment

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