PyTest - Writing Assertions
Find the mistake in this pytest assertion:
a = 1000 b = 1000 assert a is b
Find the mistake in this pytest assertion:
medium📝 Debug Q7 of 15
Step-by-Step Solution
Solution:
Step 1: Understand integer caching
Python caches small integers (-5 to 256), so integers above 256 are different objects even if values match.Step 2: Evaluate the assertion
assert a is bfails becauseaandbare different objects.Final Answer:
Assertion fails because integers above 256 are different objects -> Option BQuick Check:
Integer identity above 256 fails = C [OK]
Quick Trick: Integers >256 are distinct objects; 'is' fails [OK]
Common Mistakes:
MISTAKES- Assuming all integers are identical objects
- Confusing 'is' with '==' for numbers
- Expecting assertion to pass for large integers
Master "Writing Assertions" in PyTest
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