Python for AI Engineering· day 15 of 30
DAY 15Python
File Handling: Text, JSON & .env
Day 15 of Python for AI Engineering, completing Module 4. Make your programs remember between runs: read and write text files, save and load JSON to disk, and load configuration and secrets from .env files — the standard, safe way to keep API keys out of your code. You'll build a JSON-backed notes app that persists.
Jun 22, 2026 12 min read2.3k words
This lesson is for members
The first 4 days of Python for AI Engineering are free. Unlock the full curriculum — every day of every series, current and future — with one membership.
Monthly
₹399
per month
Annual
₹2,999
per year
Lifetime
₹6,999
one-time
- Every series, all days — including future series
- Verified, project-based, no fluff
- Progress synced across all your devices