PCEP Computer Programming and Python Fundamentals Practice Question
What function is used to read input from the user in Python 3?
⚠ Common exam trap
The PCEP exam often tests the distinction between Python 2 and Python 3 input functions, trapping candidates who remember `raw_input()` from Python 2 or who think `sys.stdin.readline()` is the standard way to read user input.
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
✓
input()
In Python 3, the built-in `input()` function reads a line from standard input and returns it as a string. This is the standard and simplest way to capture user input, replacing the Python 2 `raw_input()` function.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
read_input()
Why it's wrong here
read_input() is not a Python built-in and raises NameError, since Python 3 provides input() for reading user input. It is tempting because the name describes the task, and a user-defined helper function called read_input() would legitimately be correct in a custom codebase.
- ✗
sys.stdin.readline()
Why it's wrong here
sys.stdin.readline() reads from the standard input stream directly, returning a string including the trailing newline, and requires importing sys. The question asks for the built-in function, which is input(). sys.stdin.readline() suits scripts processing piped or redirected data where newline preservation and stream-level control matter.
- ✓
input()
Why this is correct
The built-in `input()` function reads a line from standard input, pauses execution until the user presses Enter, and returns the entered text as a string. This directly satisfies the Python 3 requirement, unlike `raw_input()`, which was renamed to `input()` in Python 3 and no longer exists.
- ✗
raw_input()
Why it's wrong here
raw_input() was renamed to input() in Python 3, so it raises NameError; it existed only in Python 2. It is tempting because Python 2 tutorials and legacy code still use it, and it would be correct when maintaining Python 2 scripts.
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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.