This repository contains the application code written for Zerodha interview process.

• There are two files downloader.py and app.py. Let's talk about them one by one.
• downloader.py
  • This file contains the code to download bhavcopy zip from the website.
  • Then it extracts the file and reads the .csv.
  • After that it stores the data in appropriate format in redis db.
  • Also it sets and expiration time for that data (More on that later).
  • Since we have stored the data in redis. The file deletes the zip and csv to save space.
• app.py
  • This is a CherryPy web app which displays the data of the top ten entries in the redis.
  • But it is not limited to do that.
  • We can do two things to get the data in redis. Make the downloader.py a scheduled job which will run every day since bhavcopy is published once every day.
  • Or don't schedule the downloader.py and instead make app.py decide when to download the latest bhavcopy.

  • How to decide when to download the latest bhavcopy ?

    • Well we know that the bhavcopy will be published at every next day.
    • So we can use that knowledge and set an expiration timer for our redis data on the next day.
    • The app.py checks if the data that we have expired or not. If the data is expired we use the downloader.py's download function to download the latest bhavcopy and render the result.

• Make sure you have Redis installed and the server is running.
• If you don't have Redis installed already. Download it from here. Or if you're using Windows you can download it from here.
• use git clone to clone the repository or download the .zip and extract it.
• cd into the directory.
• Type pip install -r requirements.txt.
• Wait... Get a coffee...
• After the download has finished type python app.py.