None port leads to a cryptic error message

[anuramat]

uvicorn version: 0.18.3
platform: macOS/apple silicon

minimal example:

from fastapi import FastAPI
import uvicorn

app = FastAPI()
uvicorn.run(app, port=None)

error message:
Traceback (most recent call last): File "/opt/homebrew/Cellar/[email protected]/3.10.6_2/Frameworks/Python.framework/Versions/3.10/lib/python3.10/logging/__init__.py", line 1100, in emit msg = self.format(record) File "/opt/homebrew/Cellar/[email protected]/3.10.6_2/Frameworks/Python.framework/Versions/3.10/lib/python3.10/logging/__init__.py", line 943, in format return fmt.format(record) File "/opt/homebrew/Cellar/[email protected]/3.10.6_2/Frameworks/Python.framework/Versions/3.10/lib/python3.10/logging/__init__.py", line 678, in format record.message = record.getMessage() File "/opt/homebrew/Cellar/[email protected]/3.10.6_2/Frameworks/Python.framework/Versions/3.10/lib/python3.10/logging/__init__.py", line 368, in getMessage msg = msg % self.args TypeError: %d format: a real number is required, not NoneType Call stack: File "/Users/arsen/dev/erdos/test.py", line 5, in <module> uvicorn.run(app, port=None) File "/Users/arsen/dev/erdos/venv/lib/python3.10/site-packages/uvicorn/main.py", line 576, in run server.run() File "/Users/arsen/dev/erdos/venv/lib/python3.10/site-packages/uvicorn/server.py", line 60, in run return asyncio.run(self.serve(sockets=sockets)) File "/opt/homebrew/Cellar/[email protected]/3.10.6_2/Frameworks/Python.framework/Versions/3.10/lib/python3.10/asyncio/runners.py", line 44, in run return loop.run_until_complete(main) File "/Users/arsen/dev/erdos/venv/lib/python3.10/site-packages/uvicorn/server.py", line 77, in serve await self.startup(sockets=sockets) File "/Users/arsen/dev/erdos/venv/lib/python3.10/site-packages/uvicorn/server.py", line 166, in startup self._log_started_message(listeners) File "/Users/arsen/dev/erdos/venv/lib/python3.10/site-packages/uvicorn/server.py", line 207, in _log_started_message logger.info( Message: 'Uvicorn running on %s://%s:%d (Press CTRL+C to quit)' Arguments: ('http', '127.0.0.1', None)

maybe add a None check?