AIMentor — AI Expertise Learning Platform

Question 1easy

In Python, how do you read the value for key 'name' from a dict `user`?

user.nameuser['name']user->nameuser::name

Question 2easy

Which Python expression is equivalent to JS `words.map(w => w.toUpperCase())`?

[w.upper() for w in words]words.map(w => w.upper())map(words, w.upper()){w.upper() for w in words}

Question 3easy

What is Python's equivalent of JavaScript's `null`?

undefinednilNonenull

Question 4medium

Which is the idiomatic way to test that a variable equals None?

if x == None:if x is None:if x === None:if not x:

Question 5medium

Which values are FALSY in Python? (Select all that apply)

[] (empty list)'' (empty string)0'0' (string containing zero)

Select all that apply.

Question 6medium

What does `nums[-1]` return for `nums = [10, 20, 30]`?

An IndexError1030undefined

Question 7medium

What is the effect of `temperature` in `def call(prompt, model='gpt-4o-mini', temperature=0.7)`?

It is a required argumentIt is a keyword argument with a default value of 0.7It makes the function asyncIt is a global variable

Question 8hard

Why is `def add_tag(tag, tags=[])` a classic Python bug?

Lists cannot be used as default valuesThe default list is created once and shared across all calls, accumulating stateIt raises a SyntaxErrortags must be typed

Question 9medium

In `def find(id: str) -> Optional[Chunk]:`, what does the return type mean?

It always returns a ChunkIt returns a Chunk or None (like TS `Chunk | null`)It returns a list of ChunksThe annotation is enforced and will crash on None

Question 10medium

What does the `@dataclass` decorator give you?

Async support for the classAuto-generated __init__, __repr__, and equality from typed fieldsDatabase persistenceA React-style component

Question 11hard

What do `5 / 2` and `5 // 2` evaluate to in Python 3?

2.5 and 22 and 2.52.5 and 2.52 and 2

Question 12medium

What is the purpose of a Python virtual environment (venv)?

To compile Python to machine codeTo isolate a project's dependencies and interpreter from the global installTo run Python in the browserTo replace type hints

Question 13medium

What one-word Python literal syntax `{...}` builds a collection of unique, unordered items (JS Set)?

Question 14hard

Name the guard line (paraphrase ok) that makes code run only when a file is executed directly, not imported.

Python for JavaScript Developers — Final Exam