Uvicorn: Attribute "app" not found in module "app.app"

Question

I'm trying to follow a basic guide to begin using FastAPI and uvicorn. I followed steps in the video, and wrote the same code(And file structure is the same, app.py in app folder, main.py in outer folder)

main.py

import uvicorn

if __name__ == "__main__":
    uvicorn.run("app.app:app", port=8000, reload=True)

app.py

from fastapi import FastAPI
app = FastAPI()

@app.get("/", tags=['ROOT'])
async def root() -> dict:
    return{"Ping":"Pong"}

Launching main.py results in the following error:

Error loading ASGI app. Attribute "app" not found in module "app.app".

I've tried renaming app.py file and launching it directly from command line using uvicorn but got the same error.

Answer 1

You should start uvicorn with app:app. The file name is already declared in the first part of app:app.

import uvicorn

if __name__ == "__main__":
    uvicorn.run("app:app", port=8000, reload=True)

Also, you could run uvicorn from your terminal like so:

uvicorn app:app --port 8000 --reload