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Which of the following expressions correctly tests if two variables m and n do NOT reference the same object?

easy📝 Conceptual Q2 of 15
Python - Operators and Expression Evaluation
Which of the following expressions correctly tests if two variables m and n do NOT reference the same object?
Am != n
Bm is not n
Cm is n
Dm <> n
Step-by-Step Solution
Solution:

  1. Step 1: Identify the correct identity operator

    is not checks if two variables do not point to the same object.

  2. Step 2: Differentiate from value inequality

    != checks if values differ, not object identity.

  3. Step 3: Recognize invalid syntax

    <> is not valid in Python 3.

  4. Final Answer:

    m is not n -> Option B

  5. Quick Check:

    is not tests object identity inequality [OK]
Quick Trick: 'is not' checks different objects, '!=' checks different values [OK]
Common Mistakes:
MISTAKES
  • Using '!=' instead of 'is not' for identity check
  • Using 'is' instead of 'is not' for negation
  • Using invalid operators like '<>'

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