Question 153 of 498
PCEP Practice Question: Data Types, Variables, Basic I/O and Operators
A beginner writes: x = 10; y = "20"; print(x + y). What will happen?
⚠ Common exam trap
Python Institute often tests the misconception that Python will automatically convert types (like JavaScript does) or that `+` always concatenates, leading candidates to pick options A or B instead of recognizing the strict type-checking that raises a `TypeError`.
Answer choices
Why each option matters
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
Python does not allow implicit type conversion between a string and an integer in an addition operation. The `+` operator with a string and an integer raises a `TypeError`, as Python's dynamic typing requires explicit conversion (e.g., `int(y)` or `str(x)`) for such mixed-type operations.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
It prints 30 as a string
Why it's wrong here
No conversion occurs; TypeError is raised.
- ✗
It prints 1020
Why it's wrong here
That would happen if both were strings; here one is int.
- ✗
It prints 30
Why it's wrong here
No automatic type conversion; prints 30 would require both operands to be numeric.
- ✓
It raises a TypeError
Why this is correct
Correct; int and str cannot be combined with +.
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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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