I'm trying to run a server from the sanic getting started example, here is my code in server.py:
from sanic import Sanic
from sanic.response import text
app = Sanic("MyHelloWorldApp")
@app.get("/")
async def hello_world(request):
return text("Hello, world.")
And when I run the default command sanic server.app everything is ok:
$ sanic server.app
[2021-12-31 17:08:21 +0700] [22196] [INFO]
┌─────────────────────────────────────────────────────────────┐
│ Sanic v21.12.0 │
│ Goin' Fast @ http://127.0.0.1:8000 │
├───────────────────────┬─────────────────────────────────────┤
│ │ mode: production, single worker │
│ ▄███ █████ ██ │ server: sanic │
│ ██ │ python: 3.9.4 │
│ ▀███████ ███▄ │ platform: Windows-10-10.0.19041-SP0 │
│ ██ │ packages: sanic-routing==0.7.2 │
│ ████ ████████▀ │ │
│ │ │
│ Build Fast. Run Fast. │ │
└───────────────────────┴─────────────────────────────────────┘
[2021-12-31 17:08:21 +0700] [22196] [WARNING] Sanic is running in PRODUCTION mode. Consider using '--debug' or '--dev' while actively developing your application.
[2021-12-31 17:08:21 +0700] [22196] [INFO] Starting worker [22196]
But when I try to run in dev mode it throws an error:
$ sanic --dev server.app
Starting in v22.3, --debug will no longer automatically run the auto-reloader.
Switch to --dev to continue using that functionality.
c:\users\ev\repos\test-dashboard\venv\scripts\python.exe: Error while finding module specification for '__main__' (ValueError: __main__.__spec__ is None)
Should I add something to run sanic in dev mode?
I'm not sure why you can't just run sanic --dev server.app. I get the same error as you.
However, running python -m sanic --dev server.app does appear to work:
D:\StackOverflow\sanic>python -m sanic --dev server.app
Starting in v22.3, --debug will no longer automatically run the auto-reloader.
Switch to --dev to continue using that functionality.
[2021-12-31 11:38:07 +0000] [7696] [INFO]
┌────────────────────────────────────────────────────────────────┐
│ Sanic v21.12.0 │
│ Goin' Fast @ http://127.0.0.1:8000 │
├───────────────────────┬────────────────────────────────────────┤
│ │ mode: debug, single worker │
│ ▄███ █████ ██ │ server: sanic │
│ ██ │ python: 3.7.3 │
│ ▀███████ ███▄ │ platform: Windows-10-10.0.19041-SP0 │
│ ██ │ auto-reload: enabled │
│ ████ ████████▀ │ packages: sanic-routing==0.7.2 │
│ │ │
│ Build Fast. Run Fast. │ │
└───────────────────────┴────────────────────────────────────────┘
[2021-12-31 11:38:07 +0000] [7696] [DEBUG] Dispatching signal: server.init.before
[2021-12-31 11:38:07 +0000] [7696] [DEBUG] Dispatching signal: server.init.after
[2021-12-31 11:38:07 +0000] [7696] [INFO] Starting worker [7696]
I also get the text Hello, world. when opening http://localhost:8000/ in a browser.