PCEP Control Flow, Loops, Lists and Logic Practice Question

A company maintains a list of employee names. They want to check if 'Alice' is in the list. Which of the following is the most Pythonic way to achieve this?

⚠ Common exam trap

Python Institute often tests the distinction between Python's `in` operator and methods from other languages (like `contains()`), or the incorrect assumption that `.index()` returns -1 on failure, which is a common trap for candidates coming from languages like Java or C++.

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

✓

if 'Alice' in employees:

The most Pythonic way because it uses the `in` operator, which directly checks membership in a list with a single, readable expression. This approach is idiomatic Python, leveraging the language's built-in support for membership testing without manual iteration or exception handling.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✗
employees.contains('Alice')
Why it's wrong here
Python lists do not have a 'contains' method; this is Java-like.
✗
for name in employees: if name == 'Alice': found = True; break
Why it's wrong here
This works but is not the most Pythonic; it requires additional variable and loop.
✗
if employees.index('Alice') != -1:
Why it's wrong here
The index() method raises a ValueError if item not found, not returning -1.
✓
if 'Alice' in employees:
Why this is correct
Correct: the 'in' operator is concise and readable.

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PCEP Control Flow, Loops, Lists and Logic Practice Question

Why each option matters

Option-by-option breakdown

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