Quick Answer
The correct code is print(int('25') + 10). This works because the int() function explicitly converts the string '25' into the integer 25, allowing Python to perform the arithmetic addition with 10 to produce 35. Without this conversion, attempting to add a string and an integer would raise a TypeError, as Python does not implicitly coerce strings to numbers for mathematical operations. On the Certified Entry-Level Python Programmer PCEP exam, this task tests your understanding of type conversion and the necessity of using int() when you need to convert string to int Python add numbers in a single expression. A common trap is forgetting the conversion and writing print('25' + 10), which fails because the plus operator concatenates strings but cannot mix types. To remember, think of int() as the key that unlocks numeric operations on digit strings—without it, Python sees text, not math.
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 needs to convert a string '25' to an integer and then add 10. Which code correctly performs this?
print(int('25') + 10)
Correct conversion and addition.
print('25' + 10)
Why wrong: This causes a TypeError because you can't concatenate str and int.
print(int('25') + '10')
Why wrong: Adding int to str causes TypeError.
print('25' + str(10))
Why wrong: This concatenates strings, not adds numbers.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
print(int('25') + 10)
Option A is correct because `int('25')` converts the string '25' to the integer 25, and then `+ 10` performs integer addition, resulting in 35. The `print()` function outputs the result. This follows Python's type conversion rules where explicit conversion is required to combine a string and an integer in arithmetic.
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.
print(int('25') + 10)
Why this is correct
Correct conversion and addition.
Related concept
Read the scenario before looking for a memorised answer.
print('25' + 10)
Why it's wrong here
This causes a TypeError because you can't concatenate str and int.
print(int('25') + '10')
Why it's wrong here
Adding int to str causes TypeError.
print('25' + str(10))
Why it's wrong here
This concatenates strings, not adds numbers.
Common exam traps
Python Institute often tests the misconception that Python will automatically convert types in arithmetic expressions, leading candidates to choose options that mix strings and integers without explicit conversion.
Detailed technical explanation
Under the hood, Python's `int()` function parses a string and returns an integer object using the `__int__()` method, while the `+` operator dispatches to `__add__()` for integers or `__concat__()` for strings. A real-world scenario is processing user input from forms, where all data arrives as strings and must be explicitly converted to numbers before arithmetic. Python's strict type system prevents implicit coercion to avoid silent data loss or unexpected behavior.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the PCEP exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
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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: print(int('25') + 10) — Option A is correct because `int('25')` converts the string '25' to the integer 25, and then `+ 10` performs integer addition, resulting in 35. The `print()` function outputs the result. This follows Python's type conversion rules where explicit conversion is required to combine a string and an integer in arithmetic.
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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