Code definition/references/peek doesn't work with files that have Python association but have no .py suffix

[versemonger]

Issue Type: Bug

Either of Python or Pylance plugins which displays code definition/references/peek seems to work only when a file has .py suffix and doesn't work when it has Python association but no .py suffix.

Extension version: 2020.12.424452561
VS Code version: Code 1.52.1 (ea3859d4ba2f3e577a159bc91e3074c5d85c0523, 2020-12-16T16:30:02.420Z)
OS version: Darwin x64 19.6.0

System Info

Item	Value
CPUs	Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz (16 x 2300)
GPU Status	2d_canvas: enabled flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled metal: disabled_off multiple_raster_threads: enabled_on oop_rasterization: enabled opengl: enabled_on protected_video_decode: unavailable_off rasterization: enabled skia_renderer: disabled_off_ok video_decode: enabled webgl: enabled webgl2: enabled
Load (avg)	3, 3, 2
Memory (System)	32.00GB (0.14GB free)
Process Argv	--crash-reporter-id d7b7b40c-8bbc-459b-9688-e7ee8b7d7acf
Screen Reader	no
VM	0%

A/B Experiments

vsliv368cf:30146710
vsreu685:30147344
openlogontheside:30221877
python763:30178808
python383cf:30185419
vspor879:30202332
vspor708:30202333
vspor363:30204092
python504:30227505
vswsl492cf:30211402
wsl2promptcf:30224613
pythonvsdeb440:30237827
unusedpromptcf:30224611
folderexplorercf:30224615
openfilemenucf:30224648
pythonvsded773:30236629
vsjup459cf:30237188

[erictraut]

A fix for this was recently introduced into pyright (the type checker that pylance is built upon). The next release of pylance will pick up the fix.

[jakebailey]

This issue has been fixed in version 2021.1.0, which we've just released. You can find the changelog here: https://github.com/microsoft/pylance-release/blob/main/CHANGELOG.md#202110-6-january-2021