200-901 Software Development and Design Practice Question
Given the Python list comprehension: result = [x*2 for x in range(10) if x > 5] What is the value of result?
⚠ Common exam trap
The trap here is that candidates often forget the filter condition and include all values, or they mistakenly apply the multiplication to the filtered indices rather than the values, leading to options like C or D.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
[12, 14, 16, 18]
The list comprehension `[x*2 for x in range(10) if x > 5]` iterates over `x` from 0 to 9, filters to only include `x` values greater than 5 (i.e., 6, 7, 8, 9), and multiplies each by 2, producing `[12, 14, 16, 18]`. This is a standard Python comprehension with a conditional filter.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
[12, 14, 16, 18]
Why this is correct
Correct: x=6->12, 7->14, 8->16, 9->18.
- ✗
[0, 2, 4, 6, 8, 10, 12, 14, 16, 18]
Why it's wrong here
This would be without the if condition.
- ✗
[10, 12, 14, 16, 18]
Why it's wrong here
Includes 10 which would correspond to x=5, but 5 is not >5.
- ✗
[6, 7, 8, 9]
Why it's wrong here
These are the x values, not doubled.
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