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24. Safe Use of Temporary Files

Temporary files can leak sensitive data if misused.

Insecure Example​

f = open("/tmp/data.txt", "w")
f.write("secret")
f.close()

Secure Example​

import tempfile

with tempfile.NamedTemporaryFile(mode="w", delete=True) as f:
    f.write("secret data")
    f.flush()

✅ Lesson: Use tempfile for secure, auto-cleaned temporary storage.