Jedi server cannot start - AttributeError: module 'typing' has no attribute '_SpecialForm'

[yajo]

Type: Bug

Since recently, Jedi server fails to start. Output shows this exception:

Traceback (most recent call last):
  File "/var/home/yajo/.vscode-oss/extensions/ms-python.python-2022.20.2-universal/pythonFiles/run-jedi-language-server.py", line 9, in <module>
    from jedi_language_server.cli import cli
  File "/var/home/yajo/.vscode-oss/extensions/ms-python.python-2022.20.2-universal/pythonFiles/lib/jedilsp/jedi_language_server/cli.py", line 7, in <module>
    from .server import SERVER
  File "/var/home/yajo/.vscode-oss/extensions/ms-python.python-2022.20.2-universal/pythonFiles/lib/jedilsp/jedi_language_server/server.py", line 14, in <module>
    from pydantic import ValidationError
  File "/var/home/yajo/.vscode-oss/extensions/ms-python.python-2022.20.2-universal/pythonFiles/lib/jedilsp/pydantic/__init__.py", line 2, in <module>
    from . import dataclasses
  File "/var/home/yajo/.vscode-oss/extensions/ms-python.python-2022.20.2-universal/pythonFiles/lib/jedilsp/pydantic/dataclasses.py", line 52, in <module>
    from typing_extensions import dataclass_transform
  File "/var/home/yajo/.vscode-oss/extensions/ms-python.python-2022.20.2-universal/pythonFiles/lib/jedilsp/typing_extensions.py", line 193, in <module>
    class _FinalForm(typing._SpecialForm, _root=True):
AttributeError: module 'typing' has no attribute '_SpecialForm'
[Info  - 7:47:21] Connection to server got closed. Server will restart.
[Error - 7:47:21] Server initialization failed.
  Message: Pending response rejected since connection got disposed
  Code: -32097 
[Error - 7:47:21] Python Jedi client: couldn't create connection to server.
  Message: Pending response rejected since connection got disposed
  Code: -32097 

No configuration changed recently on my side AFAIK... 🤔

Extension version: 2022.20.2
VSCodium version: VSCodium 1.74.3 (f8b9aeda40058455453f1298fd606caf6ff8d675, 2023-01-10T19:39:41.226Z)
OS version: Linux x64 6.1.5-200.fc37.x86_64
Modes:
Sandboxed: No

System Info

Item	Value
CPUs	AMD Ryzen 7 5700U with Radeon Graphics (16 x 4290)
GPU Status	2d_canvas: enabled canvas_oop_rasterization: disabled_off direct_rendering_display_compositor: disabled_off_ok gpu_compositing: enabled multiple_raster_threads: enabled_on opengl: enabled_on rasterization: enabled raw_draw: disabled_off_ok skia_renderer: enabled_on video_decode: disabled_software video_encode: disabled_software vulkan: disabled_off webgl: enabled webgl2: enabled webgpu: disabled_off
Load (avg)	1, 1, 1
Memory (System)	15.01GB (8.67GB free)
Process Argv	--unity-launch
Screen Reader	no
VM	0%
DESKTOP_SESSION	gnome
XDG_CURRENT_DESKTOP	GNOME
XDG_SESSION_DESKTOP	gnome
XDG_SESSION_TYPE	wayland

[karthiknadig]

What is the version of python that you are using?

[karthiknadig]

This might have been due to an outdated typing_extensions lib. I just updated the jedi-language-server, please try the pre-release that will come out tomorrow (2023.3.*)