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.
A developer accidentally wrote: print('Hello' + 5). What happens?
It prints 'Hello' and ignores the 5
Why wrong: Python does not ignore; it errors.
It prints a warning but still runs
Why wrong: Error halts execution.
It raises a TypeError
Cannot concatenate str and int.
It prints 'Hello5'
Why wrong: This would require str(5).
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
It raises a TypeError
In Python, the `+` operator is overloaded for string concatenation only when both operands are strings. Attempting to concatenate a string (`'Hello'`) with an integer (`5`) violates Python's strong dynamic typing rules, which do not perform implicit type coercion for this operation. This raises a `TypeError` with a message like 'can only concatenate str (not "int") to str'.
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.
It prints 'Hello' and ignores the 5
Why it's wrong here
Python does not ignore; it errors.
It prints a warning but still runs
Why it's wrong here
Error halts execution.
It raises a TypeError
Why this is correct
Cannot concatenate str and int.
Related concept
Read the scenario before looking for a memorised answer.
It prints 'Hello5'
Why it's wrong here
This would require str(5).
Common exam traps
The trap here is that candidates from languages like JavaScript or PHP, which perform implicit type coercion (e.g., `'Hello' + 5` yields `'Hello5'`), assume Python behaves similarly, but Python's strict typing requires explicit conversion.
Detailed technical explanation
Python's `+` operator is implemented via the `__add__` dunder method for each type. The `str` class's `__add__` method only accepts another `str` object, rejecting non-string types at the C level. This design enforces type safety and prevents ambiguous behavior like implicit conversion, which could lead to subtle bugs in data processing pipelines where mixing types is common.
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
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..
The correct answer is: It raises a TypeError — In Python, the `+` operator is overloaded for string concatenation only when both operands are strings. Attempting to concatenate a string (`'Hello'`) with an integer (`5`) violates Python's strong dynamic typing rules, which do not perform implicit type coercion for this operation. This raises a `TypeError` with a message like 'can only concatenate str (not "int") to str'.
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 25, 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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