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. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Exhibit
Traceback (most recent call last):
File "script.py", line 3, in <module>
result = "5" + 10
TypeError: can only concatenate str (not "int") to str
Refer to the exhibit. What is the cause of the error?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Using + on incompatible types (str and int)
The error occurs because the `+` operator is being used between a string and an integer, which are incompatible types in Python. Python does not implicitly convert the integer to a string for concatenation; it raises a `TypeError: unsupported operand type(s) for +: 'str' and 'int'`.
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.
✓
Using + on incompatible types (str and int)
Why this is correct
Python cannot concatenate string and int without conversion.
Related concept
Read the scenario before looking for a memorised answer.
✗
Division by zero
Why it's wrong here
No division in the code.
✗
Missing import statement
Why it's wrong here
No import needed for basic operations.
✗
Variable not defined
Why it's wrong here
The variable 'result' is being assigned.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Python Institute often tests the misconception that Python will automatically convert types (like JavaScript does), leading candidates to think the code will run without error, when in fact Python raises a TypeError for mixed-type `+` operations.
Detailed technical explanation
How to think about this question
Python's `+` operator is overloaded: for numeric types it performs addition, for strings it performs concatenation, but it does not support mixing types. This strict type enforcement prevents ambiguous operations and is part of Python's dynamic but strong typing system. In real-world code, this often occurs when concatenating user input (which is a string) with a numeric counter without explicit conversion via `str()` or f-strings.
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: Using + on incompatible types (str and int) — The error occurs because the `+` operator is being used between a string and an integer, which are incompatible types in Python. Python does not implicitly convert the integer to a string for concatenation; it raises a `TypeError: unsupported operand type(s) for +: 'str' and 'int'`.
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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Question Discussion
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