Why validation prevents bad data in FastAPI - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the FastAPI class.

FastAPI

from fastapi import [1]
app = [1]()

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AResponse

BRequest

CFastAPI

DDepends

Attempts:

3 left

💡 Hint

Common Mistakes

Importing Request or Response instead of FastAPI.

Forgetting to create the app instance.

The FastAPI class is imported to create the app instance.

2fill in blank

medium

Complete the code to define a Pydantic model for user input validation.

FastAPI

from pydantic import BaseModel

class User([1]):
    name: str
    age: int

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ABaseModel

BModel

CSchema

DValidator

Attempts:

3 left

💡 Hint

Common Mistakes

Using Model or Schema which are not Pydantic base classes.

Forgetting to inherit from any class.

Pydantic models inherit from BaseModel to enable validation.

3fill in blank

hard

Fix the error in the route decorator to accept POST requests.

FastAPI

@app.[1]("/users")
async def create_user(user: User):
    return user

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Adelete

Bget

Cput

Dpost

Attempts:

3 left

💡 Hint

Common Mistakes

Using GET instead of POST for data creation.

Using PUT or DELETE which are for update or removal.

The POST method is used to send data to the server for creation.

4fill in blank

hard

Fill both blanks to validate user input and return a success message.

FastAPI

from fastapi import [1]

@app.post("/users")
async def create_user(user: [2]):
    return {"message": f"User {user.name} created"}

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AFastAPI

BUser

CRequest

DResponse

Attempts:

3 left

💡 Hint

Common Mistakes

Using Request or Response instead of User model for input.

Not importing FastAPI.

FastAPI is imported to create the app, and User is the Pydantic model for validation.

5fill in blank

hard

Fill all three blanks to create a validated POST endpoint that returns the user's age doubled.

FastAPI

from fastapi import [1]
from pydantic import BaseModel

app = [2]()

class User(BaseModel):
    name: str
    age: int

@app.post("/double-age")
async def double_age(user: [3]):
    return {"double_age": user.age * 2}

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

AFastAPI

CUser

DBaseModel

Attempts:

3 left

💡 Hint

Common Mistakes

Using BaseModel instead of User for the parameter.

Not creating the app instance correctly.

FastAPI is imported and used to create the app instance. The User model validates input.