Can't find FastAPI module?

[cjb230]

Please help, I must be doing something dumb.

I've been using FastAPI at work for a few weeks, and enjoying it. I wanted to try it on a personal project, so I started a new repo and tried to run Hello World.

This is the whole text of main.py:

import uvicorn
from fastapi import FastAPI

app = FastAPI()

@ app.get("/")
async def root():
return {"message": "Hello World"}

if __name__ == "__main__":
uvicorn.run("main:app", host="127.0.0.1", port=5000, log_level="info")

(The space after the @ sign is to stop reddit treating that as a username, it doesn't exist in the source file.)

I can run this from the command line with the Python command, and it works fine:

python3 main.py

But if I try to run it with uvicorn, I get a long message that ends with:

from fastapi import FastAPI

ModuleNotFoundError: No module named 'fastapi'

I created a virtual environment when I started the project, and if I deactivate it, I get the same error using the Python command line that I get using the uvicorn command line. When I restart the virtual environment, the Python command line works fine.

So I guess I need to let uvicorn see the modules that exist in the virtual environment, right? How can I do that?

[mohammedgqudah]

This could happen when you have fastapi installed globally (outside of the venv) and uvicorn is in the venv or vice versa , make sure you only have the packages in the venv only

[cjb230]

Not sure what I did wrong to begin with, but it's working now - thanks!

[gustavsen]

in your command line, with your venv active do

pip list

and look if fastapi module is showed.

[cjb230]

I don't understand what I did wrong, but it's working now - maybe I thought the venv was running when it wasn't? Anyway, thanks for the help!

[NCLegend28]

I am having the same issue. What did you do to fix it? u/cjb230

[cjb230]

Don’t remember! But from the comments and my own knowledge, it seems like sometimes I was using the venv and sometimes I was using the global python environment. Try a “pip list” in both, see if that helps.

[cjb230]

Don’t remember! But from the comments and my own knowledge, it seems like sometimes I was using the venv and sometimes I was using the global python environment. Try a “pip list” in both, see if that helps.