Textual command dev mode for live editing throws error about websocket.

[gallen]

This is the first time I tried dev mode. Got this exception error,
textual run --dev app.py Traceback (most recent call last): File "/Users/liulyan/workspace/op/ARM/TESetMonitor/app.py", line 26, in <module> app.run() File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/textual/app.py", line 1210, in run asyncio.run(run_app()) File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/asyncio/runners.py", line 190, in run return runner.run(main) ^^^^^^^^^^^^^^^^ File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/asyncio/runners.py", line 118, in run return self._loop.run_until_complete(task) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/asyncio/base_events.py", line 653, in run_until_complete return future.result() ^^^^^^^^^^^^^^^ File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/textual/app.py", line 1199, in run_app await self.run_async( File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/textual/app.py", line 1161, in run_async await app._process_messages( File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/textual/app.py", line 1872, in _process_messages await self.devtools.connect() File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/textual_dev/client.py", line 116, in connect self.websocket = await self.session.ws_connect( ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/aiohttp/client.py", line 779, in _ws_connect resp = await self.request( ^^^^^^^^^^^^^^^^^^^ File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/aiohttp/client.py", line 560, in _request await resp.start(conn) File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/aiohttp/client_reqrep.py", line 899, in start message, payload = await protocol.read() # type: ignore[union-attr] ^^^^^^^^^^^^^^^^^^^^^ File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/aiohttp/streams.py", line 616, in read await self._waiter aiohttp.client_exceptions.ServerDisconnectedError: Server disconnected

Here is the output for textual diagnose,
`# Textual Diagnostics

Versions

Name	Value
Textual	0.30.0
Rich	13.3.3

Python

Name	Value
Version	3.11.1
Implementation	CPython
Compiler	Clang 13.0.0 (clang-1300.0.29.30)
Executable	/Library/Frameworks/Python.framework/Versions/3.11/bin/python3.11

Operating System

Name	Value
System	Darwin
Release	22.4.0
Version	Darwin Kernel Version 22.4.0: Mon Mar 6 21:00:17 PST 2023; root:xnu-8796.101.5~3/RELEASE_X86_64

Terminal

Name	Value
Terminal Application	iTerm.app (3.4.19)
TERM	xterm-256color
COLORTERM	truecolor
FORCE_COLOR	Not set
NO_COLOR	Not set

Rich Console options

Name	Value
size	width=202, height=29
legacy_windows	False
min_width	1
max_width	202
is_terminal	True
encoding	utf-8
max_height	29
justify	None
overflow	None
no_wrap	False
highlight	None
markup	None
height	None
`

[github-actions]

We found the following entry in the FAQ which you may find helpful:

• Why do some key combinations never make it to my app?

Feel free to close this issue if you found an answer in the FAQ. Otherwise, please give us a little time to review.

This is an automated reply, generated by FAQtory

[TomJGooding]

I've just tested this in a fresh virtual environment with textual and textual-dev and running textual run --dev seems to work fine.

Could you try creating a virtual environment and see if you get the same error?

[TomJGooding]

Did you manage to get this working @gallen?

[willmcgugan]

Assuming this is fixed. Please reopen if it is still an issue.

[github-actions]

Don't forget to star the repository!

Follow @textualizeio for Textual updates.