Lifespan context manager in FastAPI - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the asynccontextmanager decorator used for lifespan from contextlib.

FastAPI

from contextlib import [1]

Drag options to blanks, or click blank then click option'

AFastAPI

Basynccontextmanager

CRequest

DDepends

Attempts:

3 left

💡 Hint

Common Mistakes

Importing FastAPI instead of asynccontextmanager

Importing unrelated classes like Request or Depends

The asynccontextmanager decorator is imported from contextlib to define a lifespan context manager.

2fill in blank

medium

Complete the code to define an async lifespan context manager function named 'lifespan'.

FastAPI

@asynccontextmanager
async def [1]():
    print('Starting app')
    yield
    print('Shutting down app')

Drag options to blanks, or click blank then click option'

Ashutdown

Bapp

Cstartup

Dlifespan

Attempts:

3 left

💡 Hint

Common Mistakes

Naming the function differently than lifespan

Forgetting to use yield inside the function

The async function decorated with @asynccontextmanager should be named lifespan by convention for the lifespan context manager.

3fill in blank

hard

Fix the error in the code to create a FastAPI app using the lifespan context manager.

FastAPI

app = FastAPI(lifespan=[1])

Drag options to blanks, or click blank then click option'

Alifespan

Blifespan()

Clifespan_manager

Dlifespan_context

Attempts:

3 left

💡 Hint

Common Mistakes

Calling the lifespan function instead of passing it

Passing a wrong variable name

The lifespan argument expects the function itself, not a call to it.

4fill in blank

hard

Fill both blanks to correctly use the lifespan context manager with async code.

FastAPI

from contextlib import [1]

@[2]
async def lifespan():
    print('App starting')
    yield
    print('App shutting down')

Drag options to blanks, or click blank then click option'

Aasynccontextmanager

Blifespan

Ccontextmanager

Dapp

Attempts:

3 left

💡 Hint

Common Mistakes

Using synchronous contextmanager instead of asynccontextmanager

Using wrong decorator name

Use asynccontextmanager from contextlib and decorate the function with @asynccontextmanager to define an async lifespan context manager.

5fill in blank

hard

Fill all three blanks to create a FastAPI app with a lifespan context manager that prints messages on startup and shutdown.

FastAPI

from contextlib import [1]
from fastapi import FastAPI

@[2]
async def lifespan():
    print('Starting')
    yield
    print('Stopping')

app = FastAPI([3]=lifespan)

Drag options to blanks, or click blank then click option'

Aasynccontextmanager

Clifespan

Dstartup

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'startup' instead of 'lifespan' as argument

Not importing asynccontextmanager

Not decorating the function properly

Import asynccontextmanager from contextlib, decorate the async function lifespan with @asynccontextmanager, and pass it as the lifespan argument to FastAPI.