Quick Answer
The answer is TypeError. This error occurs because Python’s strong typing system strictly prohibits implicit type conversion, so attempting to concatenate a string like '10' with an integer like 5 using the + operator forces Python to choose between string concatenation and integer addition, and since it cannot do both, it raises a TypeError. On the Certified Entry-Level Python Programmer PCEP exam, this concept frequently appears in questions testing your understanding of type errors and operator behavior, often as a trick where beginners assume Python will automatically convert the integer to a string. The common trap is forgetting that + is overloaded for both addition and concatenation, but Python never guesses your intent—it demands explicit conversion. A solid memory tip: “Strong typing means no free conversions—if types clash, Python will crash.”
This PCEP practice question tests your understanding of computer programming and python fundamentals. 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.
Refer to the exhibit. ``` x = '10' y = 5 result = x + y print(result) ```
What is the output of the code in the exhibit?
Refer to the exhibit. ``` x = '10' y = 5 result = x + y print(result) ```
TypeError
Cannot concatenate str and int.
'105'
Why wrong: No implicit conversion from int to str.
105
Why wrong: Not a string, but still requires conversion.
15
Why wrong: No implicit conversion from str to int.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
TypeError
The code attempts to concatenate a string ('10') and an integer (5) using the + operator. In Python, the + operator does not implicitly convert types; it raises a TypeError because it cannot determine whether to perform string concatenation or integer addition. This is a fundamental rule of Python's strong typing system.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
TypeError
Why this is correct
Cannot concatenate str and int.
Related concept
Read the scenario before looking for a memorised answer.
'105'
Why it's wrong here
No implicit conversion from int to str.
105
Why it's wrong here
Not a string, but still requires conversion.
15
Why it's wrong here
No implicit conversion from str to int.
Common exam traps
Python Institute often tests the misconception that Python will automatically convert types (like JavaScript or PHP do), leading candidates to expect either concatenation or addition instead of recognizing that Python raises a TypeError for incompatible operand types.
Detailed technical explanation
Python's type system is strongly and dynamically typed, meaning operations between incompatible types (like str and int) raise exceptions rather than coercing values. The + operator is overloaded: for numbers it performs addition, for strings it performs concatenation, but it does not mix types. This behavior is defined in the Python data model (__add__ and __radd__ methods), and attempting to add a str and int triggers a TypeError because neither type knows how to handle the other. In real-world scenarios, this prevents silent data corruption, such as accidentally concatenating a user ID (string) with a numeric value.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Computer Programming and Python Fundamentals — This question tests Computer Programming and Python Fundamentals — Read the scenario before looking for a memorised answer..
The correct answer is: TypeError — The code attempts to concatenate a string ('10') and an integer (5) using the + operator. In Python, the + operator does not implicitly convert types; it raises a TypeError because it cannot determine whether to perform string concatenation or integer addition. This is a fundamental rule of Python's strong typing system.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 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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