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Run selection/line in python terminal seems to fail if selected too many characters #25741
Description
Type: Bug
Behaviour
On my MacBook when I select more than around 1100 characters the parsing of the selection is failing and causing then an syntax error when executed in the terminal.
Steps to reproduce:
-
Select more than 1100 characters with some indentations like functions, classes, loops,...
-
Then press shift + enter (Python: Run selection/Line in Python Terminal)
-
Now the data gets parsed wrong and is causing an Error.
screenrecording.mov
Diagnostic data
Output for Python in the Output panel (View→Output, change the drop-down the upper-right of the Output panel to Python)
XXX
Extension version: 2026.0.0
VS Code version: Code 1.108.1 (Universal) (585eba7c0c34fd6b30faac7c62a42050bfbc0086, 2026-01-14T14:55:44.241Z)
OS version: Darwin arm64 25.2.0
Modes:
- Python version (& distribution if applicable, e.g. Anaconda): 3.12.12
- Type of virtual environment used (e.g. conda, venv, virtualenv, etc.): Venv
- Value of the
python.languageServersetting: Pylance
User Settings
languageServer: "Pylance"
Installed Extensions
| Extension Name | Extension Id | Version |
|---|---|---|
| autodocstring | njp | 0.6.1 |
| copilot-chat | Git | 0.36.1 |
| debugpy | ms- | 2025.18.0 |
| echoapi-for-vscode | Ech | 1.7.13 |
| gitlens | eam | 17.9.0 |
| isort | ms- | 2025.0.0 |
| js-debug | ms- | 1.105.0 |
| js-debug-companion | ms- | 1.1.3 |
| jupyter | ms- | 2025.9.1 |
| jupyter-keymap | ms- | 1.1.2 |
| jupyter-renderers | ms- | 1.3.0 |
| LiveServer | rit | 5.7.9 |
| material-icon-theme | PKi | 5.30.0 |
| python | ms- | 2026.0.0 |
| rainbow-csv | mec | 3.24.1 |
| ruff | cha | 2026.34.0 |
| vscode-js-profile-table | ms- | 1.0.10 |
| vscode-jupyter-cell-tags | ms- | 0.1.9 |
| vscode-jupyter-slideshow | ms- | 0.1.6 |
| vscode-pylance | ms- | 2025.10.4 |
| vscode-python-envs | ms- | 1.16.0 |
| vsliveshare | ms- | 1.0.5959 |
| vsliveshare-pack | ms- | 0.4.0 |
System Info
| Item | Value |
|---|---|
| CPUs | Apple M1 Pro (8 x 2400) |
| GPU Status | 2d_canvas: enabled 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_graphite: enabled_on trees_in_viz: disabled_off video_decode: enabled video_encode: enabled webgl: enabled webgl2: enabled webgpu: enabled webnn: disabled_off |
| Load (avg) | 2, 3, 4 |
| Memory (System) | 16.00GB (0.36GB free) |
| Process Argv | --crash-reporter-id 6c7f7e46-e60f-4b2b-9859-c46c2fc707c1 |
| Screen Reader | no |
| VM | 0% |
A/B Experiments
vsliv368cf:30146710
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nativeloc1:31344060
dwcopilot:31170013
dwoutputs:31242946
copilot_t_ci:31333650
e5gg6876:31282496
pythonrdcb7:31342333
6518g693:31436602
aj953862:31281341
63221493:31336333
cloudbuttont:31379625
42190218_ostrepl:31403339
use-responses-api:31390855
ec5jj548:31422691
cmp-ext-treat:31426748
cp_cls_c_966_ss:31446431
c0683394:31419495
nes-autoexp-off:31446584
a5gib710:31434435
rename_enabled:31436409
7a04d226_do_not_restore_last_panel_session:31438103
anthropic_thinking_t:31432745
cp_cls_c_1081:31443829
copilot-nes-oct-trt:31432596
nes-jump-on-with-edit:31447383
nes-slash-models-on:31441832
nes-set-to-on:31441941
a43f0576c:31442824
ts_provider_disabled:31446105
nes-conv-1-2:31447851
Activity
anthonykim1 commentedon Feb 10, 2026
alexanderpils Are you getting the message pty connection lost when you send much line into the terminal?
alexanderpils commentedon Feb 11, 2026
No I don't get a message concerning pty connection lost. I can still send lines to the terminal and execute code.
spluta commentedon Feb 27, 2026
This happens for me as well on 1.108 and 1.109, but not on 1.107, so I am stuck there. No pty connection lost. Just with lots of lines (40+).
anthonykim1 commentedon Mar 2, 2026
spluta Could you show a gif?
alexanderpils spluta Could you guys set log level to
traceand paste the output fromterminalandpty hostoutput?spluta commentedon Mar 2, 2026
sure. files attached. It didn't like everything pasted in (so there is a file attached). again, this happens in 1.108 and 1.109, but was fine in 1.107
109error.rtf