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isalpha and isdigit do not work correctly with a subscripted input character #25543
Description
Type: Bug
Behaviour
isdigit and isalpha return True incorrectly
Steps to reproduce:
EXAMPLE CODE:
string = "dblcount 12"
items = string.split (" ")
element = items [0]
print (element [0])
if element [0].isalpha:
print ("isalpha is true")
else:
print ("isalpha is false")
if element [0].isdigit:
print ("isdigit is true")
else:
print ("isdigit is false")
element = items [1]
print (element [0])
if element [0].isalpha:
print ("isalpha is true")
else:
print ("isalpha is false")
if element [0].isdigit:
print ("isdigit is true")
else:
print ("isdigit is false")
OUTPUT:
d
isalpha is true
isdigit is true
1
isalpha is true
isdigit is true
Extension version: 2025.16.0
VS Code version: Code 1.105.1 (7d842fb85a0275a4a8e4d7e040d2625abbf7f084, 2025-10-14T22:33:36.618Z)
OS version: Windows_NT x64 10.0.26100
Modes:
- Python version (& distribution if applicable, e.g. Anaconda): 3.13.5
- Type of virtual environment used (e.g. conda, venv, virtualenv, etc.): System
- Value of the
python.languageServersetting: Default
User Settings
languageServer: "Pylance"
Installed Extensions
| Extension Name | Extension Id | Version |
|---|---|---|
| debugpy | ms- | 2025.14.1 |
| js-debug | ms- | 1.105.0 |
| js-debug-companion | ms- | 1.1.3 |
| python | ms- | 2025.16.0 |
| vscode-js-profile-table | ms- | 1.0.10 |
| vscode-pylance | ms- | 2025.8.3 |
| vscode-python-envs | ms- | 1.10.0 |
System Info
| Item | Value |
|---|---|
| CPUs | Intel(R) Core(TM) 7 150U (12 x 2611) |
| 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: disabled_off trees_in_viz: disabled_off video_decode: enabled video_encode: enabled vulkan: disabled_off webgl: enabled webgl2: enabled webgpu: enabled webnn: disabled_off |
| Load (avg) | undefined |
| Memory (System) | 15.69GB (2.85GB free) |
| Process Argv | --crash-reporter-id 8fe53d84-2b89-40ee-b241-4fd1371cb725 |
| Screen Reader | no |
| VM | 0% |
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envsdeactivate2:31353495
gendocstringf:31405073
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cloudbuttont:31379625
todos-1:31405332
v66_all_req:31402695
multireplacestring:31398340
treatment_gpt5applypatchexclusively:31398171
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Activity
eleanorjboyd commentedon Oct 23, 2025
Hi! Could you elaborate a bit more on the problem you are facing? A screenshot or recording could help me understand how exactly you are seeing this behavior in terms of its correlation to the editor. Thanks
kenglander53 commentedon Oct 23, 2025
eleanorjboyd commentedon Oct 23, 2025
Hi! Tried this and got the following:
if you can try this in your terminal without vscode and see how that goes- we should show the same experience as run from your terminal.
kenglander53 commentedon Oct 24, 2025
eleanorjboyd commentedon Oct 24, 2025
Hm not sure but maybe a good thing to try? Sorry I can't help more as it doesn't seem to be an editor issue
kenglander53 commentedon Oct 30, 2025
Hi again - just wanted to send you a "post mortem" note. I finally figured out my problem today and I suspect it is something you just fixed in the code snippet I sent without giving it a moment's thought. I left out the parenthesis after the treatments isdigit and isalpha. I have to admit, it is a puzzle to me why python does not flag this, but I guess it is not something easy to catch!
eleanorjboyd commentedon Oct 30, 2025
Thank you for the update and agreed that should be flagged - wonder if a different linter like
ruffwould catch it