[Solved] Why does this FastAPI app raise an error? from fastapi import FastAPI, Depends app = FastAPI(dependencies=[Depends('not_a_function')]) | FastAPI

FastAPI - Dependency Injection

Why does this FastAPI app raise an error?

from fastapi import FastAPI, Depends

app = FastAPI(dependencies=[Depends('not_a_function')])

ADepends cannot be used with FastAPI

BDepends argument must be a callable, not a string

CFastAPI constructor does not accept dependencies

Ddependencies must be empty list

Step-by-Step Solution

Solution:

Step 1: Check Depends argument type
Depends expects a callable (function), not a string.
Step 2: Identify cause of error
Passing a string causes a type error because FastAPI tries to call it as a function.
Final Answer:
Depends argument must be a callable, not a string -> Option B
Quick Check:
Depends() needs a function, not string [OK]

Quick Trick: Depends() argument must be a function, never a string [OK]

Common Mistakes:

MISTAKES

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