Python - Operators and Expression Evaluation
Which of the following Python expressions correctly checks if a variable
num lies between 15 and 30, including both endpoints?Which of the following Python expressions correctly checks if a variable num lies between 15 and 30, including both endpoints?
hard📝 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Understand the requirement
We need to check ifnumis between 15 and 30 inclusive, meaning it can be equal to 15 or 30 as well.Step 2: Analyze each option
- 15 <= num <= 30 uses chained comparison:
15 <= num <= 30, which checks ifnumis greater than or equal to 15 and less than or equal to 30. - num > 15 and num < 30 uses strict inequalities without equality, so it excludes 15 and 30.
- num >= 15 or num <= 30 uses
or, which is incorrect becausenumcould be less than 15 or greater than 30 and still satisfy the condition. - num > 15 or num < 30 also uses
orwith strict inequalities, which is incorrect for the same reason.
- 15 <= num <= 30 uses chained comparison:
Final Answer:
15 <= num <= 30 -> Option AQuick Check:
Test withnum = 15andnum = 30returns True [OK]
Quick Trick: Use chained comparisons for inclusive range checks [OK]
Common Mistakes:
MISTAKES- Using 'or' instead of 'and' for range checks
- Forgetting to include equality for inclusive ranges
- Using separate comparisons without chaining
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