Azure function gives Exception: ModuleNotFoundError: No module named 'XXXXXXXX'. Cannot find module.

[adityachidepatil]

Azure FUnction Essentials - Operating System: Linux Runtime version: 4.31.1.1

Question

I have been working with Azure functions for a while, and they have been working as expected so far. However, all the recent Azure Functions that I have built and deployed are giving module not found error on the imported python modules even though they have been included in the requirements.txt file. We can clearly see that the modules get installed in GitHub build and deployment, but the Azure Function log stream shows

"Microsoft.Azure.WebJobs.Script.Workers.Rpc.RpcException: Result: Failure
Exception: ModuleNotFoundError: No module named 'pandas'. 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: ['/home/site/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']"

I have been investigating this issue for a couple of days now. I went through the documentation for troubleshooting and previous GitHub threads discussing this or other similar issues. At first the issue seemed to be only with "pyodbc" module but on further investigation we found that it is an error on Azure side and not on Python. Similar kind of issues were found before where Azure Functions failed with Python and they were swiftly resolved in later versions.

We have tried:

• Rebuilding and redeploying the functions
• Using alternative modules
• Downgrading the python modules to previous stable versions (as suggested in some of the solutions) but to no avail.

I would really appreciate if anyone could give me some inputs. @asavaritayal @ankitkumarr

[Blaze404]

Are you putting the correct installation command in your deployment .yml file?

[adityachidepatil]

Hey, Yes I am having the correct installation command and default path i.e. the repository root for installing the packages as can be seen below. I am attaching my deployment.yml file.

name: Build and deploy Python project to Azure Function App - **********************

on:
  push:
    branches:
      - master
  workflow_dispatch:

env:
  AZURE_FUNCTIONAPP_PACKAGE_PATH: '.' # set this to the path to your web app project, defaults to the repository root
  PYTHON_VERSION: '3.10' # set this to the python version to use (supports 3.6, 3.7, 3.8)

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Setup Python version
        uses: actions/setup-python@v1
        with:
          python-version: ${{ env.PYTHON_VERSION }}

      - name: Create and start virtual environment
        run: |
          python -m venv venv
          source venv/bin/activate

      - name: Install Unix ODBC Drivers
        run: sudo apt-get install unixodbc-dev

      - name: Install dependencies
        run: pip install -r requirements.txt

      # Optional: Add step to run tests here

      - name: Zip artifact for deployment
        run: zip release.zip ./* -r

      - name: Upload artifact for deployment job
        uses: actions/upload-artifact@v3
        with:
          name: python-app
          path: |
            release.zip
            !venv/

  deploy:
    runs-on: ubuntu-latest
    needs: build
    environment:
      name: 'Production'
      url: ${{ steps.deploy-to-function.outputs.webapp-url }}
    permissions:
      id-token: write #This is required for requesting the JWT

    steps:
      - name: Download artifact from build job
        uses: actions/download-artifact@v3
        with:
          name: python-app

      - name: Unzip artifact for deployment
        run: unzip release.zip

      - name: Login to Azure
        uses: azure/login@v1
        with:
          client-id: ${{ *************************************************************** }}
          tenant-id: ${{ *************************************************************** }}
          subscription-id: ${{ *************************************************************** }}

      - name: 'Deploy to Azure Functions'
        uses: Azure/functions-action@v1
        id: deploy-to-function
        with:
          app-name: '***************************'
          slot-name: 'Production'
          package: ${{ env.AZURE_FUNCTIONAPP_PACKAGE_PATH }}
          scm-do-build-during-deployment: true
          enable-oryx-build: true

[bhagyshricompany]

@gavin-aguiar pls comment and validate the same.Thanks

[gavin-aguiar]

@adityachidepatil Can you modify your 'Install Dependencies' step to

pip install --target="./.python_packages/lib/site-packages" -r ./requirements.txt

and try again? All libraries should be installed in /home/site/wwwroot/.python_packages/lib/site-packages

[adityachidepatil]

Hey @gavin-aguiar Thank you so much for your response. I tried modifying the yml and deployed the function again using

• name: Install dependencies run: pip install --target="./.python_packages/lib/site-packages" -r ./requirements.txt

Unfortunately, it is still giving me the same error.

I would also like to point out that while exploring this issue, I found that existing function with same repository works but when I create a new function using exactly same repository it is throwing an error.

Please let me know if you need any specific information from me, I would be happy to provide it.

[gavin-aguiar]

@adityachidepatil it could be an issue in your new function thats causing the error. Would you be able to share your functionapp name ?

[adityachidepatil]

Hey @gavin-aguiar I tried remote build and deployment, and it worked, for some reason it is not working through our CI/CD pipeline. Anyways thank you so much, I truly appreciate your support.