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In pytest, what does the is not operator verify when used in assertions?

easy🧠 Conceptual Q1 of 15
PyTest - Writing Assertions
In pytest, what does the is not operator verify when used in assertions?
AThat two variables are equal in content
BThat two variables have different values
CThat two variables do not reference the same object
DThat two variables are both None
Step-by-Step Solution
Solution:
  1. Step 1: Understand is not operator

    The is not operator checks if two variables do not point to the same object in memory.
  2. Step 2: Differentiate from equality

    It does not compare values but object identity, so different objects with same content are considered different.
  3. Final Answer:

    That two variables do not reference the same object -> Option C
  4. Quick Check:

    Check object identity, not value equality [OK]
Quick Trick: Use 'is not' to check different objects, not values [OK]
Common Mistakes:
MISTAKES
  • Confusing 'is not' with '!=' which checks value inequality
  • Assuming 'is not' compares content instead of identity

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