Python - Context Managers
You want to write a context manager that logs when a file is opened and closed. Which method must you implement to ensure the file closes even if an error occurs?
You want to write a context manager that logs when a file is opened and closed. Which method must you implement to ensure the file closes even if an error occurs?
hard📝 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Understand context manager methods
Custom context managers implement __enter__ to start and __exit__ to clean up resources.Step 2: Identify method for closing on errors
The __exit__ method runs even if exceptions occur, so it handles closing safely.Final Answer:
__exit__ -> Option AQuick Check:
__exit__ handles cleanup and errors [OK]
Quick Trick: __exit__ method cleans up resources safely [OK]
Common Mistakes:
- Confusing __enter__ with cleanup
- Thinking __init__ manages resource closing
- Assuming __open__ is a valid method
Master "Context Managers" in Python
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