Question 429 of 498
PCEP Control Flow, Loops, Lists and Logic Practice Question
Exhibit
Refer to the exhibit.
# config.py
allowed_ports = [80, 443, 8080]
def check_port(port):
if port in allowed_ports:
return True
else:
return False
# main.py
from config import check_port
print(check_port(80))A developer runs main.py and gets True. They then modify config.py by adding `allowed_ports.append(22)` and run main.py again without restarting the interpreter. What is the output?
⚠ Common exam trap
Test-takers frequently assume Python re-executes the imported module each time it is imported, but in reality, Python caches modules and only loads them once per interpreter session, so modifications to the source file after the first import are ignored.
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
✓
True
Python imports modules only once per interpreter session; subsequent imports use the cached module object. Since `config.py` was already imported, modifying the file does not affect the already-loaded list object in memory. The `allowed_ports` list remains unchanged, so the condition that originally returned `True` still holds.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
False
Why it's wrong here
Port 80 is still in the list.
- ✗
None
Why it's wrong here
Function returns a boolean.
- ✗
Error
Why it's wrong here
No error.
- ✓
True
Why this is correct
The module is not reloaded, so the function still uses the original list.
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Last reviewed: Jun 11, 2026
This PCEP practice question is part of Courseiva's free Python Institute certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCEP exam.
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