PCEP Practice Question: Data Types, Variables, Basic I/O and Operators
This PCEP practice question tests your understanding of data types, variables, basic i/o and operators. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A student is learning Python and writes a program to compute the area of a rectangle. The code:
When the user enters 5 and 3, the program crashes with a TypeError: can't multiply sequence by non-int of type 'str'. The student is puzzled because they thought input returns numbers. What is the correct explanation and fix?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The input function returns a string, so use int(input("Enter length: ")) and int(input("Enter width: ")).
Option A is correct because the `input()` function in Python always returns a string, even if the user types a number. When you try to multiply two strings (or a string by a string), Python raises a `TypeError` because it cannot multiply sequences by non-integers. The fix is to explicitly convert the input to an integer using `int()` before performing arithmetic.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
The input function returns a string, so use int(input("Enter length: ")) and int(input("Enter width: ")).
Why this is correct
Conversion to int allows multiplication.
Related concept
Read the scenario before looking for a memorised answer.
✗
The error is due to variable names length and width conflicting with built-in functions; rename them to l and w.
Why it's wrong here
No conflict; length and width are not built-in functions.
✗
The print function cannot handle the multiplication result because area is a string; convert area to int.
Why it's wrong here
area is already the result of multiplication; error occurs before print.
✗
The error can be fixed by using the eval function to directly evaluate the input as Python code.
Why it's wrong here
eval is dangerous and not recommended for user input.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Python Institute often tests the misconception that `input()` returns a number when the user types digits, leading candidates to forget explicit type conversion, and they may incorrectly choose options that suggest renaming variables or using `eval()`.
Detailed technical explanation
How to think about this question
In Python, `input()` reads a line from standard input and returns it as a string object. The `*` operator on strings performs repetition (e.g., 'ab' * 3 gives 'ababab'), but it requires an integer on the right side. When both operands are strings, Python raises `TypeError: can't multiply sequence by non-int of type 'str'`. This is a common pitfall for beginners who assume `input()` returns a numeric type, and it highlights the importance of explicit type conversion (`int()`, `float()`) for arithmetic operations.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Data Types, Variables, Basic I/O and Operators — This question tests Data Types, Variables, Basic I/O and Operators — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The input function returns a string, so use int(input("Enter length: ")) and int(input("Enter width: ")). — Option A is correct because the `input()` function in Python always returns a string, even if the user types a number. When you try to multiply two strings (or a string by a string), Python raises a `TypeError` because it cannot multiply sequences by non-integers. The fix is to explicitly convert the input to an integer using `int()` before performing arithmetic.
What should I do if I get this PCEP question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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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.
Question Discussion
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