Which Python code block is an example of an context manager? A. B. C. D.

Question

Exhibits

Options

• Awhile True: device = Device(host="vmx-1", user="lab", passwd="lab123") ...
• Btry: device = Device(host="vmx-1", user="lab", passwd="lab123") ...
• Cwith Device(host="vmx-1", user="lab", passwd="lab123") as device: ...
• Dfor host in ["vmx-1", "vmx-2"]: device = Device(host=host, user="lab", passwd="lab123") ...

• A
  89% (33)
• B
  8% (3)
• D
  3% (1)

Explanation

There is an error in this question's answer key - option C is actually correct, not A. Here's the accurate explanation:

Option C is the context manager because it uses Python's with statement, which is the defining syntax for context managers. The with block automatically calls __enter__() when entering and __exit__() when leaving (even if an exception occurs), handling setup and teardown - like opening/closing a network device connection - without explicit cleanup code.

Option A (while True) is an infinite loop - it keeps running until break or an exception; it has no automatic resource management. Option B (try/except) is error handling - it can simulate some cleanup behavior with a finally block, but it is not a context manager. Option D (for) is a simple iteration loop with no resource lifecycle management.

Memory tip: Think of with as "with a guarantee" - Python guarantees cleanup runs when the block exits, no matter what. If you see with X as y:, that's always a context manager.

Note for exam takers: If your official answer key says A, flag it - this is a mistake. The with statement (option C) is unambiguously the Python context manager pattern as defined in PEP 343.

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