Question 3 of 169
PCAP Strings Practice Question
Exhibit
>>> s = "Hello" >>> s[1] = "a"
Refer to the exhibit. What happens when the code is executed?
⚠ Common exam trap
Python Institute often tests the immutability of strings by presenting code that attempts index assignment, trapping candidates who assume strings are mutable like lists.
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
✓
A TypeError is raised
The code attempts to modify a string by assigning a new character to an index position (s[0] = 'H'). Strings in Python are immutable, meaning their elements cannot be changed after creation. This operation raises a TypeError because the item assignment is not supported for string objects.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The string becomes "Hallo"
Why it's wrong here
Strings are immutable, so item assignment is not allowed.
- ✓
A TypeError is raised
Why this is correct
Strings are immutable; assigning to an index raises TypeError.
- ✗
A SyntaxError is raised
Why it's wrong here
The syntax is valid; the error occurs at runtime.
- ✗
The code runs without error and s remains "Hello"
Why it's wrong here
Assignment to a string index raises a TypeError.
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Last reviewed: Jun 30, 2026
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