200-901 Software Development and Design Practice Question
A developer wants to process a list of server hostnames and create a new list containing only hostnames that start with 'web'. Which Python list comprehension correctly accomplishes this?
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
✓
[hostname for hostname in servers if hostname.startswith('web')]
The list comprehension filters items based on the condition and produces a new list.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
[hostname.startswith('web') for hostname in servers]
Why it's wrong here
This returns a list of booleans, not hostnames.
- ✗
[hostname for hostname in servers if 'web' in hostname]
Why it's wrong here
This checks substring, not start of string; could match hostnames containing 'web' anywhere.
- ✓
[hostname for hostname in servers if hostname.startswith('web')]
Why this is correct
Correct syntax for list comprehension with condition.
- ✗
[hostname if hostname.startswith('web') for hostname in servers]
Why it's wrong here
Incorrect syntax; the condition goes after the for clause.
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