[Python] how to run fastapi project in debug mode auto reload in vscode

Started with fastapi python.

this is how I am string my server

class Server:
def __init__(self):
self.app = FastAPI()

def runServer(self, host: str, port: int,is_dev:bool):
uvicorn.run(self.app, host=host, port=port,debug=is_dev)


if __name__ == "__main__":
server = Server()
# read the environment variables
host: str = os.environ['host']
port: int = int(os.environ['port'])
is_dev: bool = bool(os.environ['dev'])

server.runServer(host, port, is_dev)


this ups the server but not running in auto reload mode if i make any changes.

even I tried

uvicorn.run(self.app, host=host, port=port, reload=is_dev)


reload is i guess not an option, thus causing the server to break.

i tried passing --reload args in launch.json even but still not working

{
// Use IntelliSense to learn about possible attributes.
// Hover to view descriptions of existing attributes.
// For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
"version": "0.2.0",
"configurations": [
{
"name": "Python: FastAPI",
"type": "python",
"request": "launch",
"program": "${workspaceFolder}/main.py",
"jinja": true,
"args": ["--reload"],
"env": {
"host": "127.0.0.1",
"port": "5555",
"dev": "true"
}
}
]
}


any idea? am i missing something?

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