Path parameter types and validation in FastAPI - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a path parameter as an integer in FastAPI.

FastAPI

from fastapi import FastAPI
app = FastAPI()

@app.get('/items/{item_id}')
async def read_item(item_id: [1]):
    return {"item_id": item_id}

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

Astr

Bbool

Cfloat

Dint

Attempts:

3 left

💡 Hint

Common Mistakes

Using str instead of int for numeric path parameters.

Forgetting to specify a type, which defaults to str.

The path parameter item_id should be typed as int to ensure FastAPI treats it as an integer.

2fill in blank

medium

Complete the code to validate that the path parameter item_id is greater than zero.

FastAPI

from fastapi import FastAPI, Path
app = FastAPI()

@app.get('/items/{item_id}')
async def read_item(item_id: int = Path(..., gt=[1])):
    return {"item_id": item_id}

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

A1

B-1

C0

DNone

Attempts:

3 left

💡 Hint

Common Mistakes

Using ge=0 which allows zero, not strictly greater.

Setting gt to a negative number.

The gt=0 argument ensures item_id must be greater than zero.

3fill in blank

hard

Fix the error in the code by specifying the correct type for the path parameter user_id.

FastAPI

from fastapi import FastAPI
app = FastAPI()

@app.get('/users/{user_id}')
async def get_user(user_id: [1]):
    return {"user_id": user_id}

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

Afloat

Bint

Cstr

Dbool

Attempts:

3 left

💡 Hint

Common Mistakes

Using str when numeric IDs are expected.

Using float which is not typical for IDs.

The user_id should be an int to match expected numeric user IDs.

4fill in blank

hard

Fill both blanks to declare a path parameter item_id as an integer and validate it to be between 1 and 100.

FastAPI

from fastapi import FastAPI, Path
app = FastAPI()

@app.get('/items/{item_id}')
async def read_item(item_id: [1] = Path(..., ge=[2], le=100)):
    return {"item_id": item_id}

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

Aint

Bstr

C1

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Using str instead of int.

Setting ge to 0 instead of 1.

Use int for the type and ge=1 to ensure the value is at least 1.

5fill in blank

hard

Fill all three blanks to declare a path parameter user_id as an integer, validate it to be positive, and add a description.

FastAPI

from fastapi import FastAPI, Path
app = FastAPI()

@app.get('/users/{user_id}')
async def get_user(user_id: [1] = Path(..., gt=[2], description=[3])):
    return {"user_id": user_id}

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

Astr

B0

C"The ID of the user"

Dint

Attempts:

3 left

💡 Hint

Common Mistakes

Using str instead of int.

Omitting the description or using wrong quotes.

Use int type, gt=0 to ensure positive values, and add a descriptive string for documentation.