PCEP Practice Question: Data Types, Variables, Basic I/O and Operators
A developer needs to convert a string '25' to an integer and then add 10. Which code correctly performs this?
⚠ Common exam trap
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.
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
✓
print(int('25') + 10)
`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.
Answer analysis
Option-by-option breakdown
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.
- ✗
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.
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