Pydantic model basics in FastAPI - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a Pydantic model with a name field.

FastAPI

from pydantic import BaseModel

class User([1]):
    name: str

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AModelBase

BBaseModel

CModel

DBase

Attempts:

3 left

💡 Hint

Common Mistakes

Using a wrong base class name like Model or Base.

Forgetting to inherit from any class.

The Pydantic model must inherit from BaseModel to work properly.

2fill in blank

medium

Complete the code to create a Pydantic model with an age field of type integer.

FastAPI

from pydantic import BaseModel

class Person(BaseModel):
    age: [1]

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Astr

Bbool

Cfloat

Dint

Attempts:

3 left

💡 Hint

Common Mistakes

Using str for age which should be a number.

Using float which allows decimals.

The age field should be an integer, so use int as the type.

3fill in blank

hard

Fix the error in the Pydantic model by completing the missing base class.

FastAPI

from pydantic import BaseModel

class Product([1]):
    id: int
    price: float

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AModelBase

BModel

CBaseModel

DProductBase

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect base classes that cause runtime errors.

Forgetting to inherit from any class.

The model must inherit from BaseModel to validate fields correctly.

4fill in blank

hard

Fill both blanks to create a Pydantic model with a required string field and an optional integer field.

FastAPI

from typing import [1]
from pydantic import BaseModel

class Item(BaseModel):
    name: str
    quantity: [2][int] = None

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AOptional

BList

CDict

DSet

Attempts:

3 left

💡 Hint

Common Mistakes

Using List or Dict which expect collections, not optional values.

Not importing Optional from typing.

Use Optional from typing to mark quantity as optional.

5fill in blank

hard

Fill all three blanks to define a Pydantic model with a string field, a float field with a default, and a boolean field.

FastAPI

from pydantic import BaseModel

class Config(BaseModel):
    env: [1]
    version: [2] = 1.0
    debug: [3] = False

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

Astr

Bfloat

Cbool

Dint

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up types like using int for version which is a float.

Forgetting to assign default values for optional fields.

The env field is a string, version is a float with default 1.0, and debug is a boolean with default False.