FastAPI MCQs and Answers with Explanation | FastAPI Quiz

FastAPI MCQs and Answers with Explanation: FastAPI is a modern and fast (high-performance) web framework for building APIs with Python 3.7+ based on standard Python type hints. It is designed to be easy to use and intuitive, providing developers with a powerful toolkit to create APIs quickly and efficiently. If you are looking to enhance your knowledge about FastAPI through these Top 25 FastAPI MCQs and Answers, then read through this article. Scroll down to the next section to learn more about this concept and access the FastAPI Quiz.

FastAPI MCQs and Answers

FastAPI is a cutting-edge web framework for creating APIs with Python 3.7+ that combines high performance with ease of use. With its intuitive design and built-in support for asynchronous programming, FastAPI has quickly become a popular choice for developing modern web applications. In this set of FastAPI Multiple Choice Questions and answers, we will explore the various features of FastAPI, its benefits, and how to get started with building web applications using this framework. Whether you are a seasoned developer or just starting out, these MCQs on FastAPI will provide you with valuable insights into this powerful tool and help you build robust and scalable APIs with ease.

FastAPI Multiple Choice Questions

Top 25 FastAPI MCQs and Answers | FastAPI Quiz

1. What is FastAPI?

a) A programming language
b) A web framework for building APIs
c) A database management system
d) A front-end framework

Answer: b

Explanation: FastAPI is a modern, fast (high-performance) web framework for building APIs with Python c)6+ based on standard Python type hints.

2. Which Python version does FastAPI support?

a) Python b)7+
b) Python c)2+
c) Python c)4+
d) Python c)6+

Answer: d

Explanation: FastAPI requires Python c)6 or later to run.

3. What is the main advantage of using FastAPI over other web frameworks?

a) It is easier to learn and use
b) It is faster and more efficient
c) It has better documentation
d) It has a larger community of users

Answer: b

Explanation: FastAPI is designed to be fast and efficient, making it a good choice for high-performance applications.

4. Which of the following is a feature of FastAPI?

a) Built-in support for asynchronous programming
b) Built-in support for SQL databases
c) Built-in support for machine learning
d) Built-in support for front-end development

Answer: a

Explanation: FastAPI has built-in support for asynchronous programming, which allows it to handle a large number of concurrent requests without blocking.

5. What is the purpose of the @app.get() decorator in FastAPI?

a) To define a new route for handling GET requests
b) To define a new database table
c) To define a new class for handling requests
d) To define a new function for handling requests

Answer: a

Explanation: The @app.get() decorator in FastAPI is used to define a new route for handling GET requests.

6. Which of the following is a valid FastAPI endpoint definition?

a) @app.get(‘/users/{id}’)
def get_user(id: int):
return {‘id’: id}
b) @app.post(‘/users/{id}’)
def get_user(id: int):
return {‘id’: id}
c) @app.get(‘/users’)
def get_users():
return {‘users’: []}
d) @app.get(‘/users/{id}’, method=’GET’)
def get_user(id: int):
return {‘id’: id}

Answer: a

Explanation: Option A is a valid endpoint definition in FastAPI, which defines a GET endpoint at the ‘/users/{id}’ URL with a parameter ‘id’ of type int.

7. What is the purpose of the Pydantic library in FastAPI?

a) To provide database management functionality
b) To provide serialization and deserialization of data
c) To provide front-end development tools
d) To provide machine learning functionality

Answer: b

Explanation: Pydantic is a data validation and serialization library that is used in FastAPI to serialize and deserialize data sent to and from endpoints.

8. Which of the following is a valid Pydantic model definition in FastAPI?

a) class User:
id: int
name: str
b) class User(BaseModel):
id: int
name: str
c) def User(id: int, name: str):
return {‘id’: id, ‘name’: name}
d) class User:
def init(self, id: int, name: str):
self.id = id
self.name = name

Answer: b

Explanation: Option B is a valid Pydantic model definition in FastAPI, which defines a User model with properties ‘id’ and ‘name’ of type int and str, respectively.

9. Which of the following is an example of a query parameter in FastAPI?

a) @app.get(‘/users/{id}’)
def get_user(id: int):
return {‘id’: id}
b) @app.get(‘/users’)
def get_users(page: int = 1):
return {‘page’: page}
c) @app.post(‘/users’)
def create_user(user: dict):
return user
d) @app.put(‘/users/{id}’)
def update_user(id: int, user: dict):
return {‘id’: id, **user}

Answer: b

Explanation: Option B is an example of a query parameter in FastAPI, which is specified as an argument with a default value in the function definition.

10. What is the purpose of the Response class in FastAPI?

A) To handle incoming requests
b) To define outgoing responses
c) To validate request parameters
d) To store database records

Answer: b

Explanation: The Response class in FastAPI is used to define outgoing responses from an API endpoint.

11. Which of the following is an example of a FastAPI response?

a) {‘status’: ‘success’, ‘data’: {‘id’: 1, ‘name’: ‘John’}}
b) @app.get(‘/users’)
def get_users():
return User.objects.all()
c) @app.post(‘/users’)
def create_user(user: dict):
return User(**user).save()
d) @app.put(‘/users/{id}’)
def update_user(id: int, user: dict):
return User.objects.filter(id=id).update(**user)

Answer: a

Explanation: Option A is an example of a FastAPI response, which is a JSON object with a ‘status’ field and a ‘data’ field containing the response data)

12. What is the purpose of the @app.middleware() decorator in FastAPI?

a) To define a new middleware function for handling requests
b) To define a new route for handling requests
c) To define a new database table
d) To define a new class for handling requests

Answer: a

Explanation: The @app.middleware() decorator in FastAPI is used to define a new middleware function for handling requests.

13. Which of the following is a valid FastAPI middleware definition?

a) @app.middleware()
def my_middleware(request, response):
pass
b) class MyMiddleware:
def call(self, request, response):
pass
c) @app.middleware()
class MyMiddleware:
def call(self, request, response):
pass
d) def my_middleware(request, response):
pass

Answer: b

Explanation: Option B is a valid FastAPI middleware definition, which defines a class with a ‘call’ method that accepts a request and a response.

14. Which of the following is a valid FastAPI dependency definition?

a) def my_dependency():
pass
b) class MyDependency:
pass
c) @app.dependency()
def my_dependency():
pass
d) @app.dependency()
class MyDependency:
pass

Answer: d

Explanation: Option D is a valid FastAPI dependency definition, which defines a class decorated with ‘@app.dependency()’.

15. What is the purpose of a FastAPI dependency?

a) To define a database schema
b) To validate request parameters
c) To provide shared functionality between endpoints
d) To handle incoming requests

Answer: c

Explanation: A FastAPI dependency is used to provide shared functionality between endpoints, such as authentication, authorization, or database connections.

16. Which of the following is an example of a FastAPI dependency injection?

a) @app.get(‘/users’)
def get_users():
db = get_database()
return db)query(User).all()
b) @app.post(‘/users’)
def create_user(user: dict, db: Session = Depends(get_database)):
db_user = User(**user)
db)add(db_user)
db)commit()
db)refresh(db_user)
return db_user
c) @app.put(‘/users/{id}’)
def update_user(id: int, user: dict, db: Session = Depends(get_database)):
db)query(User).filter(User.id == id).update(user)
db)commit()
return {‘id’: id, **user}
d) @app.delete(‘/users/{id}’)
def delete_user(id: int):
db = get_database()
db)query(User).filter(User.id == id).delete()
db)commit()

return {‘id’: id}

Answer: b

Explanation: Option B is an example of a FastAPI dependency injection, which injects a database Session dependency into the function using the ‘Depends’ class.

17. Which of the following is an example of a FastAPI path operation decorator?

a) @app.middleware()
def my_middleware(request, response):
pass
b) @app.get(‘/users’)
def get_users():
pass
c) @app.dependency()
def my_dependency():
pass
d) @app.post(‘/users’)
def create_user(user: dict):
pass

Answer: b

Explanation: Option B is an example of a FastAPI path operation decorator, which decorates a function with a HTTP method and a path.

18. Which of the following is a valid HTTP method for a FastAPI path operation decorator?

a) POST
b) PUT
c) PATCH
d) All of the above

Answer: d

Explanation: FastAPI supports all of the above HTTP methods for path operation decorators, as well as GET and DELETE.

19. Which of the following is a valid FastAPI path parameter definition?

a) @app.get(‘/users/{id}’)
def get_user(id: int):
pass
b) @app.get(‘/users’)
def get_users(id: int):
pass
c) @app.get(‘/users/{id}’)
def get_user(id: str):
pass
d) @app.get(‘/users/{id}’)
def get_user(user_id: int):
pass

Answer: a

Explanation: Option A is a valid FastAPI path parameter definition, which specifies a parameter in the path using curly braces and assigns it a type annotation.

20. Which of the following is a valid FastAPI query parameter definition?

a) @app.get(‘/users/{id}’)
def get_user(id: int):
pass
b) @app.get(‘/users’)
def get_users(page: int = 1):
pass
c) @app.get(‘/users’)
def get_users(page: int):
pass
d) @app.get(‘/users’)
def get_users(page: str):
pass

Answer: b

Explanation: Option B is a valid FastAPI query parameter definition, which specifies a parameter in the query string using an argument with a default value in the function definition.

21. Which of the following is an example of a FastAPI request body?

a) {‘id’: 1, ‘name’: ‘John’}
b) @app.get(‘/users’)
def get_users():
pass
c) @app.post(‘/users’)
def create_user(user: dict):
pass
d) @app.put(‘/users/{id}’)
def update_user(id: int, user: dict):
pass

Answer: c

Explanation: Option C is an example of a FastAPI request body, which defines a parameter in a POST or PUT request that contains the data to be sent to the server.

22. Which of the following is a valid FastAPI response model definition?

a) class User(BaseModel):
id: str
name: str
b) @app.get(‘/users/{id}’)
def get_user(id: int) -> dict:
pass
c) @app.post(‘/users’)
def create_user(user: dict) -> None:
pass
d) @app.put(‘/users/{id}’)
def update_user(id: int, user: dict) -> Union[dict, None]:
pass

Answer: a

Explanation: Option A is a valid FastAPI response model definition, which defines a Pydantic model to be used to validate and serialize responses from a path operation.

23. Which of the following is a valid FastAPI response header definition?

a) @app.get(‘/users/{id}’)
def get_user(id: int):
return {‘X-Total-Count’: 10}
b) @app.post(‘/users’)
def create_user(user: dict):
return {‘X-Total-Count’: 10}
c) @app.put(‘/users/{id}’)
def update_user(id: int, user: dict):
return {‘X-Total-Count’: 10}
d) None of the above

Answer: a

Explanation: Option A is a valid FastAPI response header definition, which sets a custom header in the response using a dictionary.

24. Which of the following is a valid FastAPI exception handler?

a) @app.middleware(‘http’)
def handle_http_exception(request, response, exc):
pass
b) @app.exception_handler(ValueError)
def handle_value_error(request, exc):
pass
c) @app.middleware()
def handle_exception(request, response, exc):
pass
d) @app.exception_handler(HTTPException)
def handle_http_exception(request, exc):
pass

Answer: b

Explanation: Option B is a valid FastAPI exception handler, which handles exceptions of a specific type using a decorator on a function that accepts the request and the exception object.

25. Which of the following is a valid FastAPI middleware?

a) @app.get(‘/users’)
def get_users():
pass
b) @app.middleware()
def my_middleware(request, response):
pass
c) @app.post(‘/users’)
def create_user(user: dict):
pass
d) @app.exception_handler(ValueError)
def handle_value_error(request, exc):
pass

Answer: b

Explanation: Option B is a valid FastAPI middleware, which intercepts requests and responses in the application and can modify them or perform additional operations.

FastAPI is a powerful and intuitive web framework for building APIs with Python that offers high performance and scalability. With the knowledge gained from this set of FastAPI Quiz Questions and answers, developers can confidently leverage the capabilities of FastAPI to build fast, reliable, and modern web applications. So, candidates are advised to bookmark us Freshersnow for more Technical Quizzes.