PCEP Control Flow, Loops, Lists and Logic Practice Question

A data analyst has a list of temperature readings in Celsius and wants to create a new list containing only readings that are valid (>= -273.15 and <= 1000). Which code correctly creates the filtered list?

⚠ Common exam trap

Python Institute often tests the distinction between inclusive (`<=`, `>=`) and exclusive (`<`, `>`) comparisons, and the trap here is that candidates may overlook the boundary values or choose a syntactically incorrect loop structure like Option C.

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

✓

valid = [temp for temp in temps if -273.15 <= temp <= 1000]

It uses a list comprehension with a chained comparison (`-273.15 <= temp <= 1000`) that correctly includes both boundary values. This syntax is Pythonic and ensures temperatures equal to -273.15 or 1000 are considered valid, matching 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.

✓
valid = [temp for temp in temps if -273.15 <= temp <= 1000]
Why this is correct
Correct; uses chained comparison to include boundaries.
✗
valid = [temp for temp in temps if temp > -273.15 and temp < 1000]
Why it's wrong here
Excludes -273.15 and 1000.
✗
valid = [] for t in temps: if t > -273.15 and t < 1000: valid.append(t)
Why it's wrong here
Invalid syntax; missing colon or indentation.
✗
valid = list(filter(lambda t: t >= -273.15, temps))
Why it's wrong here
Only checks lower bound.

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PCEP Control Flow, Loops, Lists and Logic Practice Question

Why each option matters

Option-by-option breakdown

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