PCEP Computer Programming and Python Fundamentals Practice Question
Exhibit
NameError: name 'x' is not defined
Refer to the exhibit. What is the most likely cause of this error?
⚠ Common exam trap
The PCEP exam often tests the distinction between a variable being undefined versus being of a certain type, tricking candidates into thinking the error is about type mismatch when it is actually about the variable not existing yet.
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
✓
Variable x is used before assignment
The error message indicates that variable 'x' is being referenced before it has been assigned a value. In Python, using a variable that has not been defined yet raises a NameError. Option B correctly identifies this as the cause.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Variable x is a string
Why it's wrong here
A string variable would not cause a NameError.
- ✓
Variable x is used before assignment
Why this is correct
This is the typical cause of a NameError in Python.
- ✗
Variable x is an integer
Why it's wrong here
An integer variable would not cause a NameError.
- ✗
Variable x is misspelled
Why it's wrong here
Misspelling would likely cause a similar error, but the most direct cause is that x was never assigned.
Go deeper
Related to this question
About these practice questions
Courseiva writes every PCEP question from scratch — 498 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
JA
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.