__init__.py

import os
import copy
import logging 

from azure.data.tables import TableClient
from azure.data.tables import UpdateMode
from azure.core.exceptions import ResourceExistsError
import azure.functions as func 

class CounterUpdater(object):
    def __init__(self):
        self.connection_string = os.getenv("AzureCosmosDBConnectionString")
        self.table_name = "crc-db"

    def fetchEntityData(self):      
        with TableClient.from_connection_string(self.connection_string, self.table_name) as table_client:
            entity = {
                "PartitionKey": "visitorpart",
                "RowKey": "visitors",
                "count": 400,
            }
            
            try:
                table_client.create_entity(entity = entity)
                table_entity = table_client.get_entity(partition_key=entity["PartitionKey"], row_key=entity["RowKey"])
            except ResourceExistsError:
                table_entity = table_client.get_entity(partition_key=entity["PartitionKey"], row_key=entity["RowKey"])
                table_entity["count"] += 1
            
            table_client.update_entity(mode=UpdateMode.REPLACE, entity=table_entity)
            return table_entity
            

def main(req: func.HttpRequest) -> func.HttpResponse:
    counter = CounterUpdater()
    table_entity = counter.fetchEntityData()
    return func.HttpResponse(f"{table_entity['count']}")