---
title: "Configure the Advanced I/O function"
url: https://docs.catalyst.zoho.com/en/tutorials/newsapp/python/configure-advancedio/
description: "Build a web news application that automatically fetches news from a third-party service periodically using the Catalyst Job Scheduling Cron component, and a Job Function and Advanced I/O function coded in Python."
last_updated: 2025-11-19T15:07:41Z
service: All Services
type: tutorial
related_links:
  - name: "Advanced I/O Function"
    url: /en/serverless/help/functions/advanced-io
  - name: "Data Store"
    url: /en/cloud-scale/help/data-store/introduction
  - name: "ZCQL"
    url: /en/cloud-scale/help/zcql/introduction
---

# Configure the Advanced I/O Function

The Advanced I/O function directory (`functions/news_app_function`) contains the following files: 

* The `main.py` main function file
* The `catalyst-config.json` configuration file
* [requirements.txt](https://docs.catalyst.zoho.com/en/cli/v1/project-directory-structure/functions-directory/#python-modules-and-function-dependencies) file

#### Add Code

You will be adding code in the `main.py` file.

The Advanced I/O function fetches the news item from its source table in the Data Store and forwards it to the client component as a JSON response.

Copy the code and paste it in the  `main.py` in the `functions/news_app_function ` directory.

**main.py**

```python
import logging
from flask import Request, make_response, jsonify
import zcatalyst_sdk
def handler(request: Request):
    #Initializing Catalyst SDK
    app = zcatalyst_sdk.initialize()
    logger = logging.getLogger()
    # GET API that gets the news from the required table
    if request.path == "/fetchData":
        table_name = request.args.get("tablename")
        logger.info("Fetching news from datastore table - "+table_name)
        zcql_instance = app.zcql()
        # Query to fetch news from table
        query = "Select title,url from "+table_name
        #Queries the Catalyst Data Store table and gets the required news
        zcql_result = zcql_instance.execute_query(query)
        return jsonify({"content": zcql_result}), 200
    else:
        # For undefined path error will be thrown
        response = make_response('Unknown path')
        response.status_code = 400
        return response

```

The Advanced I/O function is now configured. We will discuss the application's architecture after we configure the client.