PCEP Control Flow, Loops, Lists and Logic Practice Question
A developer needs to implement a loop that prints numbers from 10 down to 1. Which loop correctly achieves this?
⚠ Common exam trap
Python Institute often tests the exclusive nature of the stop argument in `range()`, leading candidates to forget that the stop value is never included in the sequence.
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
✓
for i in range(10, 0, -1): print(i)
`range(10, 0, -1)` generates numbers from 10 down to 1 inclusive. The start is 10, the stop is 0 (exclusive), and the step is -1, so the sequence is 10, 9, 8, ..., 1. This matches the requirement exactly.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
for i in range(10, 0, -1): print(i)
Why this is correct
Correct; step -1 from 10 down to 1.
- ✗
for i in range(10, 0): print(i)
Why it's wrong here
Empty range; default step=1, start>stop.
- ✗
for i in reversed(range(1, 10)): print(i)
Why it's wrong here
Prints 9 to 1, not 10.
- ✗
for i in range(10, 1, -1): print(i)
Why it's wrong here
Prints 10 to 2 (stop exclusive).
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