Deploying python function apps to azure

I am trying to make my first python function app. The app is just a simple app that creates a blob file. The code runs locally. However when I deploy to Azure I dont see the function app.

If I remove this, then it works:

from azure.identity import DefaultAzureCredential
from azure.storage.blob import BlobServiceClient, BlobClient, ContainerClient

Full code:

import logging
import datetime
import azure.functions as func

from azure.identity import DefaultAzureCredential
from azure.storage.blob import BlobServiceClient, BlobClient, ContainerClient

app = func.FunctionApp()
    
@app.timer_trigger(schedule="0 * * * * *", arg_name="myTimer", run_on_startup=False, use_monitor=False) 
def timer_trigger(myTimer: func.TimerRequest) -> None:
     
    logging.info('Python timer trigger function executed.')

Configuration in azure:
[
  {
    "name": "APPINSIGHTS_INSTRUMENTATIONKEY",
    "value": "xx-6dd2-xx-9ab8-xx",
    "slotSetting": true
  },
  {
    "name": "APPLICATIONINSIGHTS_CONNECTION_STRING",
    "value": "InstrumentationKey=xx;IngestionEndpoint=https://westeurope-5.in.applicationinsights.azure.com/;LiveEndpoint=https://westeurope.livediagnostics.monitor.azure.com/;ApplicationId=xxx",
    "slotSetting": false
  },
  {
    "name": "AzureWebJobsStorage",
    "value": "DefaultEndpointsProtocol=https;AccountName=xx;AccountKey=xx;EndpointSuffix=core.windows.net",
    "slotSetting": false
  },
  {
    "name": "BUILD_FLAGS",
    "value": "UseExpressBuild",
    "slotSetting": false
  },
  {
    "name": "AzureWebJobsStorage__accountname",
    "value": "stsxxxondev",
    "slotSetting": false
  },
  {
    "name": "ENABLE_ORYX_BUILD",
    "value": "true",
    "slotSetting": false
  },
  {
    "name": "FUNCTIONS_EXTENSION_VERSION",
    "value": "~4",
    "slotSetting": false
  },
  {
    "name": "FUNCTIONS_WORKER_RUNTIME",
    "value": "python",
    "slotSetting": false
  },
  {
    "name": "SCM_DO_BUILD_DURING_DEPLOYMENT",
    "value": "1",
    "slotSetting": false
  },
  {
    "name": "XDG_CACHE_HOME",
    "value": "/tmp/.cache",
    "slotSetting": false
  }
]

Solution

I have created a Python Azure function App and deployed your function code. Able to sync the timer trigger in portal.

function_app.py:

import datetime
import logging
import azure.functions as func
from azure.identity import DefaultAzureCredential
from azure.storage.blob import BlobClient, BlobServiceClient, ContainerClient

app = func.FunctionApp()

def upload_blob_data(blob_service_client: BlobServiceClient, container_name: str):

     time_now  = datetime.datetime.now().strftime('%m_%d_%Y_%H_%M_%S') 
     blob_client = blob_service_client.get_blob_client(container=container_name, blob=f"{time_now}.txt")
     data = b"Sample data for blob"

     # Upload the blob data - default blob type is BlockBlob    
     blob_client.upload_blob(data, blob_type="BlockBlob")

@app.timer_trigger(schedule="0 * * * * *", arg_name="myTimer", run_on_startup=False, use_monitor=False) 
def timer_trigger(myTimer: func.TimerRequest) -> None:

     account_url = "https://<storage>.blob.core.windows.net"
     credential = DefaultAzureCredential()

    # Create the BlobServiceClient object
     blob_service_client = BlobServiceClient(account_url, credential=credential)
     upload_blob_data(blob_service_client, "json")
     logging.info('Python timer trigger function executed.')

local.settings.json:

{
  "IsEncrypted": false,
  "Values": {
    "FUNCTIONS_WORKER_RUNTIME": "python",
    "AzureWebJobsFeatureFlags": "EnableWorkerIndexing",
    "AzureWebJobsStorage": "UseDevelopmentStorage=true"
  }
}

Enable Managed Identity in the function app.
Navigate to Storage Account=>Access Control=>Add Role Assignment, assign Storage Blob Data Contributor role to the functionapp's managed identity.

Add application setting AzureWebJobsStorage__accountname= <storagename> in the Function app=>settings=>Environment Variables:

Deployment logs:

enter image description here

Portal:

enter image description here

Response:

Blobs in Storage Container: