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19. Safe Directory Operations

When working with directories, always handle race conditions, permissions, and cleanup securely.

Example​

import os

path = "logs"
os.makedirs(path, exist_ok=True)
if not os.access(path, os.W_OK):
    raise PermissionError("Directory not writable.")

✅ Lesson: Use os.makedirs(..., exist_ok=True) and check permissions before writing files.