PCEP Computer Programming and Python Fundamentals Practice Question
A Python script processes a large file and runs out of memory. Which solution is most appropriate?
⚠ Common exam trap
The PCEP exam often tests the misconception that reading a file in chunks with a while loop is the best approach, when in fact the idiomatic for loop over the file object is simpler, safer, and the recommended pattern in Python for line-by-line processing.
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
✓
Process the file line by line using a for loop
Reading a file line by line with a for loop in Python processes one line at a time, keeping only the current line in memory. This avoids loading the entire file into RAM, which is the root cause of the memory exhaustion when dealing with large files.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Increase the memory allocation
Why it's wrong here
This is a temporary workaround and does not address the root issue; the script remains inefficient.
- ✗
Use a while loop to read chunks
Why it's wrong here
While possible, a for loop over the file object is more Pythonic and equally efficient.
- ✗
Read the entire file into memory and split
Why it's wrong here
This would worsen memory usage, causing the same or worse problem.
- ✓
Process the file line by line using a for loop
Why this is correct
This reads each line as needed, keeping memory usage low.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.