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←Level 3 — OOP & File I/O
File I/O
Persistent Data Sutra
1 / 6⚡ 135 XP
Step 1 — Persistent I/O
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File I/O: Data That Lasts

with open('data.txt', 'r') as f: → for line in f: → process

Goal: Master open(), context managers, read modes, and CSV parsing.