200-901 Software Development and Design Practice Question
What is the output of the following code?
my_list = [1, 2, 3]
for i in range(len(my_list)):
my_list[i] += 1
print(my_list)
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
✓
[2, 3, 4]
The code modifies each element by adding 1. So [1,2,3] becomes [2,3,4].
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
[2, 3, 4]
Why this is correct
Correct, each element incremented by 1.
- ✗
[1, 2, 3, 1]
Why it's wrong here
Not correct.
- ✗
[1, 2, 3]
Why it's wrong here
No change.
- ✗
Error
Why it's wrong here
No error, list is mutable.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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