[Solved] Given the code below, what will be the output when accessing the /items/ endpoint?from fastapi import FastAPI, Depends app = FastAPI() def get_number(): return 42 @app.... | FastAPI

FastAPI - Dependency Injection

Given the code below, what will be the output when accessing the /items/ endpoint?

from fastapi import FastAPI, Depends

app = FastAPI()

def get_number():
    return 42

@app.get('/items/')
def read_items(number: int = Depends(get_number)):
    return {"number": number}

A{"number": "get_number"}

B{"number": 42}

CError: missing required parameter

D{"number": null}

Step-by-Step Solution

Solution:

Step 1: Understand dependency injection
The get_number function returns 42, and FastAPI injects this value into the number parameter.
Step 2: Check the returned response
The route returns a dictionary with key "number" and value 42, so the output is {"number": 42}.
Final Answer:
{"number": 42} -> Option B
Quick Check:
Depends injects 42 = {"number": 42} [OK]

Quick Trick: Depends calls function and injects return value [OK]

Common Mistakes:

MISTAKES

Expecting the function name instead of its return value
Thinking parameter is missing if not passed explicitly
Assuming null is returned if no argument given

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More FastAPI Quizzes

Given the code below, what will be the output when accessing the /items/ endpoint?

Step 1: Understand dependency injection

Step 2: Check the returned response

Final Answer:

Quick Check:

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