Pylance using outdated pandas stubs

[Terrigible]

Type: Bug

The pandas.Series.cumprod method has an incorrect Never return type, which has since been fixed with pandas-dev/pandas-stubs#1374 more than 1 month ago as of the release of the Pylance 2025.9.1 on 21 October 2025. Yet, this change has not been made to the extension's stub file for that method.

Extension version: 2025.9.1
VS Code version: Code 1.105.1 (7d842fb85a0275a4a8e4d7e040d2625abbf7f084, 2025-10-14T22:33:36.618Z)
OS version: Windows_NT x64 10.0.26200
Modes:

[github-actions]

Hi @Terrigible, I'm an AI Support assistant here to help with your issue. While the team reviews your request, I wanted to provide some possible tips and documentation that might help you in the meantime.

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Potential Duplicate Issues – These issues may be duplicates of your report, but may differ in some of the details.

• Code marked as unreachable after pandas concat – outdated stub for pandas.concat uses Never, causing unreachable code analysis. Code marked as unreachable after pandas concat #5630

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Similar Issues (FYI only, not solutions)

The following issues may or may not be related to your report. They are provided for reference only, as they may describe similar symptoms, affect the same feature, or address related concerns, but may not be the same issue.

• How to update stubs? – Discusses clearing outdated Pillow stub definitions by purging the extension's stub folder to force a refresh. How to update stubs ? #1798
• Use with Pandas? – Addresses interference from third-party stub packages and suggests installing the microsoft/python-type-stubs. Use with Pandas? pyright#1466

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[rchiodo]

Thanks for noticing. Our stubs update was stalled. Should be in our next release.