17. Secure File Handling Basics

Improper file handling can lead to data leaks or corruption. Always open files safely, validate paths, and handle encoding explicitly.

Insecure Example

data = open("user_data.txt").read()

Secure Example

with open("user_data.txt", "r", encoding="utf-8") as f:
    data = f.read()

✅ Lesson: Use context managers and explicit encodings to prevent file corruption and leaks.