[Solved] Given this code snippet, what will be printed when a request is made to /users/5?... Given this code snippet, what will be printed when a request is made to /users/5? | FastAPI

FastAPI - Dependency Injection

Given this code snippet, what will be printed when a request is made to /users/5?

from fastapi import FastAPI, Depends

app = FastAPI(dependencies=[Depends(lambda: print('Global dep called'))])

@app.get('/users/{user_id}')
async def read_user(user_id: int):
    return {'user_id': user_id}

AGlobal dep called printed only once at startup

BNo output printed

CGlobal dep called printed once per request

DError because print cannot be a dependency

Step-by-Step Solution

Solution:

Step 1: Understand when global dependencies run
Global dependencies run before every request, so the print statement runs each time.
Step 2: Confirm print output behavior
Each request triggers the lambda, printing 'Global dep called' once per request.
Final Answer:
Global dep called printed once per request -> Option C
Quick Check:
Global dependency runs per request = print runs each time [OK]

Quick Trick: Global dependencies run before every request, so print runs each time [OK]

Common Mistakes:

MISTAKES

Thinking global dependencies run only once at startup
Assuming print cannot be used in dependencies
Expecting no output from print

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Given this code snippet, what will be printed when a request is made to /users/5?

Step 1: Understand when global dependencies run

Step 2: Confirm print output behavior

Final Answer:

Quick Check:

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