FastAPI Quiz — 7 Free Questions

Question 1

What is the purpose of "async" database drivers, such as "asyncpg" for PostgreSQL, when used with a FastAPI application's async route handlers?

Question 2

What is the purpose of FastAPI's "Annotated" type hint pattern, such as "item_id: Annotated[int, Path(gt=0)]"?

Question 3

What is the purpose of a FastAPI route's "response_model_exclude_unset" parameter?

Question 4

What is the purpose of FastAPI's "Header()" function/class, used to declare a parameter?

Question 5

What does FastAPI do differently for a plain, synchronous "def" route handler, compared to an "async def" one, in terms of how it's actually executed?

Question 6

What is the purpose of FastAPI's "include_in_schema=False" parameter, applied to a specific route?

Question 7

What is the purpose of FastAPI's "response_model_exclude_none" parameter?

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About FastAPI

FastAPI is one of the newer names in this list, first released by Sebastian Ramirez in 2018, but it has grown remarkably fast for a framework that young. It's built specifically for creating APIs in Python, and its name is a genuinely accurate description on two fronts: fast to develop with, and fast to actually run.

Under the hood, FastAPI is built on top of two other libraries rather than reinventing everything from scratch: Starlette handles the actual asynchronous web serving, while Pydantic handles data validation using Python's own type hints. That combination is what lets FastAPI automatically generate interactive API documentation, using the OpenAPI standard, directly from a developer's existing code, without any extra manual documentation work required.

That automatic documentation feature alone won over a lot of teams who were tired of API docs quietly going out of date, but the bigger technical draw has been raw performance. Because FastAPI is built on Python's async foundations rather than older, more traditional synchronous patterns, independent benchmarks have shown it handling traffic at speeds much closer to frameworks written in Go or Node.js than to older Python frameworks like Flask or Django.

FastAPI's growth on GitHub has been unusually rapid for a relatively young project, climbing to become one of the most-starred Python web frameworks within just a few years of its initial release, a sign of just how quickly Python developers adopted it once they discovered it.

Its timing has also worked heavily in its favor. As machine learning teams increasingly needed a fast, genuinely Python-native way to serve their trained models as web APIs, FastAPI became an almost obvious default choice, and its adoption has grown right alongside the broader AI boom of the past several years.

Today it's common to see FastAPI specifically recommended in machine learning and data science courses as the go-to way to turn a model into a usable API, a niche it has captured almost completely from older, more general-purpose Python web frameworks.

Compared to Django, which was built years earlier around a more traditional, synchronous request-handling model, FastAPI was designed from the ground up around Python's newer async capabilities, which is where much of its performance advantage actually comes from rather than any single clever trick. Compared to the lighter Flask framework, FastAPI trades away a little bit of Flask's minimalism in exchange for built-in validation and documentation that would otherwise need to be added manually through extensions.

FastAPI also includes its own dependency injection system, letting developers cleanly share things like database connections or authentication logic across many different API endpoints without repeating the same setup code over and over, a feature that's won over teams building larger, more complex APIs rather than simple single-purpose services.

FastAPI's rapid rise has also influenced other Python frameworks to adopt similar ideas around type-hint-based validation and automatic documentation, and it's increasingly used as the reference example in Python programming courses specifically for teaching modern API design, a notable shift for a framework that didn't even exist before 2018.