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
The filter x > 5 restricts iteration to 6, 7, 8 and 9, since range(10) stops before 10. Doubling each yields 12, 14, 16 and 18, so the comprehension produces exactly that four-element list in ascending order.
- ✗
[0, 2, 4, 6, 8, 10, 12, 14, 16, 18]
Why it's wrong here
The filter x > 5 excludes 0 through 5, so doubling every element of range(10) is wrong. It is tempting because it applies the x*2 transform correctly, and it would be correct had the comprehension omitted the if condition entirely.
- ✗
[10, 12, 14, 16, 18]
Why it's wrong here
The comprehension doubles each value after filtering, so 6 becomes 12, not 10. It is tempting because it correctly selects 6 through 9, and it would be correct if the expression were x + 4 rather than x*2.
- ✗
[6, 7, 8, 9]
Why it's wrong here
This returns the filtered values themselves without applying the x*2 transform. It is tempting because the filter x > 5 is applied correctly, and it would be correct if the comprehension were [x for x in range(10) if x > 5].
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