FastAPI says missing folder name as module

问题

I have a question related to FastAPI with uvicorn in pycharm. My project is having following structure:

LearningPy <folder name> 
 |  
 |-- apis <folder name>  
 -----|--modelservice <folder name>  
 ---------|--dataprovider.py  
 ---------|--main.py  
 ---------|--persondetails.py  
 -----|--config.py

First I was using following path : D:\Learnings\apis and ran following code : uvicorn main:app --reload then it was giving error :

Uvicorn running on http://0.0.0.0:8000 (Press CTRL+C to quit)
Started reloader process [23445]
Error loading ASGI app. Could not import module "apis".

However, after reading suggestion from here, I have changed the path to D:\Learnings\apis\modeservice and above error gone but now it started throwing a different error : ModuleNotFoundError: No module named 'apis'

Here are my main.py and config.py code files :

main.py --

import uvicorn
from fastapi import FastAPI
from starlette.middleware.cors import CORSMiddleware
from datetime import datetime

from apis import config
from apis.modelservice import dataprovider

app = FastAPI(debug=True)
def get_application() -> FastAPI:
    application = FastAPI(title="PersonProfile", description="Learning Python CRUD",version="0.1.0")
    origins = [
        config.API_CONFIG["origin_local_ip"],
        config.API_CONFIG["origin_local_url"]
    ]
    application.add_middleware(
        CORSMiddleware,
        allow_origins=origins,
        allow_credentials=True,
        allow_methods=["*"],
        allow_headers=["*"],
    )
    #application.include_router(processA.router)
    return application

app = get_application()

@app.get("/")
def read_root():
    return {"main": "API Server " + datetime.now().strftime("%Y%m%d %H:%M:%S")}

@app.get("/dbcheck")
def read_root():
    try:
        dataprovider.get_db().get_collection("Person")
    except Exception as e:
        return {"failed":e}
    else:
        return { "connected":True}

if __name__ == "__main__":
    uvicorn.run(app, host="0.0.0.0", port=8000, reload=True)

And here is config.py--

API_CONFIG = {
    "origin_local_ip": "http://127.0.0.1:3000",
    "origin_local_url": "http://localhost:3000"
}

This project is being built on React+Mongo+python (pymongo for connecting mongodb).

Thanks in advance.

回答1:

The problem in your application is your module organization,firstly i tried your folder structring i get the same errors as yours, i debugged it a little bit, i found the error was on importing config so i dived more deeply to understand why Python can not import your config,

I created a script on the top folder to find out why. Also added in print line in the config.py and modelservice.main.py

print('__file__={0:<35} | __name__={1:<20} | __package__={2<20}'.format(__file__,__name__,str(__package__)))
import apis.config
import apis.modelservice.main

This was the structure

apis
├── config.py
└── modelservice
    └── main.py

I run the script in the top folder script named main.py, It ended up with this result:

 __file__=main.py | __name__=__main__ | __package__=None                
__file__=/home/yagiz/Desktop/test/apis/config.py | __name__=apis.config | package__=apis                
apis.config
__file__=/home/yagiz/Desktop/test/apis/modelservice/main.py | __name__=apis.modelservice.main | __package__=apis.modelservice

It felt strange because i should be able to relative import, but when i tried to import that what

from .. import config

it returned:

  File "./main.py", line 8, in <module>
    from .. import config
ImportError: attempted relative import with no known parent package

Just for the testing it out i tried this structure, also i used absolute import import config:

apis/
├── modelservice
    ├── config.py
    ├── main.py

INFO:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
INFO:     Started reloader process [14155] using statreload
__file__=./main.py  | __name__=main | __package__=                    
__file__=./config.py  | __name__=config   | __package__= config
INFO:     Started server process [14157]
INFO:     Waiting for application startup.
INFO:     Application startup complete.

Everything worked fine like that, so the problem is with your module organization and how you importing things so take a look at them again.

回答2:

Added to what Yagizcan answered above, if anyone still getting module import error in pycharm then change the sources root to the code folder from File menu.

LearningPy <folder name> 
 |  
 |-- apis <folder name>  
 -----|--modelservice <folder name>  
 ---------|--dataprovider.py  
 ---------|--persondetails.py  
------|--main.py    
------|--config.py

Here I have moved the main.py outside of modelservice folder. since main.py will be running as api. Then, to run the code I have added following code uvicorn path to apisfolder.main:app --reload. And now it ran without any problem.

来源：https://stackoverflow.com/questions/62965442/fastapi-says-missing-folder-name-as-module

标签

python

pymongo

fastapi