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You need to open and read from multiple files safely in Python, ensuring all files are closed properly. Which approach is best?

hard🚀 Application Q8 of Q15
Python - Context Managers

You need to open and read from multiple files safely in Python, ensuring all files are closed properly. Which approach is best?

AOpen all files without <code>with</code> and close manually later
BUse nested <code>with</code> statements for each file
COpen files in a loop without closing them
DUse <code>try-except</code> without closing files
Step-by-Step Solution
Solution:

  1. Step 1: Recognize resource safety

    Each file must be closed to avoid resource leaks.

  2. Step 2: Use nested with statements

    Nested with ensures each file is closed automatically after use.

  3. Final Answer:

    Use nested with statements for each file -> Option B

  4. Quick Check:

    Nested with blocks ensure all files close [OK]
Quick Trick: Use nested with to manage multiple files [OK]
Common Mistakes:
MISTAKES
  • Forgetting to close files manually
  • Assuming loop auto-closes files
  • Ignoring exceptions causing leaks

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