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BUG: Type error supplying SQLAlchemy NVARCHAR length in to_sql()

Bug

Needs TriageIssue that has not been reviewed by a pandas team memberIssue that has not been reviewed by a pandas team member

Typingtype annotations, mypy/pyright type checkingtype annotations, mypy/pyright type checking

Status: Open.

#61660 In pandas-dev/pandas;

· philipnye opened on Jun 14, 2025

Use TypeAlias in code where types are declared

Typingtype annotations, mypy/pyright type checkingtype annotations, mypy/pyright type checking

Status: Open (in progress).

pandas-dev/pandasnumber 61504

#61504 In pandas-dev/pandas;

· Dr-Irv opened on May 27, 2025

· 37/43

15

TYP: npt._ArrayLikeInt_co does not exist

Typingtype annotations, mypy/pyright type checkingtype annotations, mypy/pyright type checking

Status: Open.

#61387 In pandas-dev/pandas;

· jorenham opened on May 1, 2025

ENH: Export (a subset of?) pandas._typing for type checking

Enhancement

Typingtype annotations, mypy/pyright type checkingtype annotations, mypy/pyright type checking

Status: Open.

#55231 In pandas-dev/pandas;

· caneff opened on Sep 21, 2023

38 comments

CI: Test daily with pandas-stubs tests

CIContinuous IntegrationContinuous Integration

Typingtype annotations, mypy/pyright type checkingtype annotations, mypy/pyright type checking

Status: Open.

#54095 In pandas-dev/pandas;

· Dr-Irv opened on Jul 12, 2023

ENH: Implement "Pydantic protocol"

Enhancement

Needs DiscussionRequires discussion from core team before further actionRequires discussion from core team before further action

Typingtype annotations, mypy/pyright type checkingtype annotations, mypy/pyright type checking

Status: Open.

#53999 In pandas-dev/pandas;

· Kludex opened on Jul 4, 2023

1

12 comments

TYP/DOC: importing from api.py/__init__.py

API Design

Needs DiscussionRequires discussion from core team before further actionRequires discussion from core team before further action

Typingtype annotations, mypy/pyright type checkingtype annotations, mypy/pyright type checking

Status: Open.

#48186 In pandas-dev/pandas;

· twoertwein opened on Aug 20, 2022

TYP: Remove Sequence[str] in type annotations

Typingtype annotations, mypy/pyright type checkingtype annotations, mypy/pyright type checking

Status: Open.

#47232 In pandas-dev/pandas;

· Dr-Irv opened on Jun 4, 2022

18 comments

BUG: pd.MultiIndex.reindex when the levels are pd.Int64Index behaves differently.

Closing CandidateMay be closeable, needs more eyeballsMay be closeable, needs more eyeballs

Error ReportingIncorrect or improved errors from pandasIncorrect or improved errors from pandas

MultiIndex

Typingtype annotations, mypy/pyright type checkingtype annotations, mypy/pyright type checking

Usage Question

Status: Open.

#46833 In pandas-dev/pandas;

· olofahlen opened on Apr 22, 2022

1 comment

TYP: how to annotate DataFrame.__getitem__

Needs DiscussionRequires discussion from core team before further actionRequires discussion from core team before further action

Typingtype annotations, mypy/pyright type checkingtype annotations, mypy/pyright type checking

Status: Open.

#46616 In pandas-dev/pandas;

· twoertwein opened on Apr 2, 2022

7 comments

ENH: Add set of tests to type check the public APIs

CIContinuous IntegrationContinuous Integration

Enhancement

Testingpandas testing functions or related to the test suitepandas testing functions or related to the test suite

Typingtype annotations, mypy/pyright type checkingtype annotations, mypy/pyright type checking

Status: Open.

#45252 In pandas-dev/pandas;

· Dr-Irv opened on Jan 7, 2022

1

49 comments

TYP: Improve typing on pandas.core.algorithms.duplicated()

duplicatedduplicated, drop_duplicatesduplicated, drop_duplicates

Typingtype annotations, mypy/pyright type checkingtype annotations, mypy/pyright type checking

Status: Open.

#42604 In pandas-dev/pandas;

· Dr-Irv opened on Jul 19, 2021

1

TYP: Numpy compatibility of definition of "array like"

ExtensionArrayExtending pandas with custom dtypes or arrays.Extending pandas with custom dtypes or arrays.

Typingtype annotations, mypy/pyright type checkingtype annotations, mypy/pyright type checking

Status: Open.

#41807 In pandas-dev/pandas;

· Dr-Irv opened on Jun 3, 2021

16 comments

BUG: invalid type annotation for equal operator of Series

Numeric OperationsArithmetic, Comparison, and Logical operationsArithmetic, Comparison, and Logical operations

Typingtype annotations, mypy/pyright type checkingtype annotations, mypy/pyright type checking

Status: Open.

#40762 In pandas-dev/pandas;

· ikokostya opened on Apr 2, 2021

4 comments

ENH: Using pyright to analyze missing type declarations

Enhancement

Typingtype annotations, mypy/pyright type checkingtype annotations, mypy/pyright type checking

Status: Open.

#39813 In pandas-dev/pandas;

· Dr-Irv opened on Feb 14, 2021

5 comments

TYP: clean notations in the wrong place

Typingtype annotations, mypy/pyright type checkingtype annotations, mypy/pyright type checking

Status: Open.

#39108 In pandas-dev/pandas;

· jreback opened on Jan 11, 2021

10 comments

ENH: Type annotations for Index

Enhancement

Typingtype annotations, mypy/pyright type checkingtype annotations, mypy/pyright type checking

Status: Open.

#36708 In pandas-dev/pandas;

· itamarst opened on Sep 28, 2020

9 comments

Refactor pandas.core.generic.NDFrame.to_replace() to appease static type analysis

RefactorInternal refactoring of codeInternal refactoring of code

replacereplace methodreplace method

Typingtype annotations, mypy/pyright type checkingtype annotations, mypy/pyright type checking

Status: Open.

#34898 In pandas-dev/pandas;

· oguzhanogreden opened on Jun 20, 2020

2 comments

Refactor inherit_names to work by inheritance

Typingtype annotations, mypy/pyright type checkingtype annotations, mypy/pyright type checking

Status: Open.

#32100 In pandas-dev/pandas;

· SaturnFromTitan opened on Feb 19, 2020

2 comments

MyPy doesn't recognize scalar arithmetic for pandas classes

Typingtype annotations, mypy/pyright type checkingtype annotations, mypy/pyright type checking

Status: Open.

#31160 In pandas-dev/pandas;

· WillAyd opened on Jan 20, 2020

8 comments

DISC: enable disallow_any_generics for mypy in setup.cfg?

CIContinuous IntegrationContinuous Integration

Needs DiscussionRequires discussion from core team before further actionRequires discussion from core team before further action

Typingtype annotations, mypy/pyright type checkingtype annotations, mypy/pyright type checking

Status: Open.

#30539 In pandas-dev/pandas;

· simonjayhawkins opened on Dec 29, 2019

1 comment

Type annotations are inconsistent for 'columns' in IO methods

API - ConsistencyInternal Consistency of API/BehaviorInternal Consistency of API/Behavior

Typingtype annotations, mypy/pyright type checkingtype annotations, mypy/pyright type checking

Status: Open.

#30449 In pandas-dev/pandas;

· ShaharNaveh opened on Dec 24, 2019

3 comments

Align ExtensionArray with abc.Sequence

Enhancement

ExtensionArrayExtending pandas with custom dtypes or arrays.Extending pandas with custom dtypes or arrays.

Needs DiscussionRequires discussion from core team before further actionRequires discussion from core team before further action

Typingtype annotations, mypy/pyright type checkingtype annotations, mypy/pyright type checking

Status: Open.

#28770 In pandas-dev/pandas;

· WillAyd opened on Oct 3, 2019

11 comments

TYPING: Unreachable code

Clean

Typingtype annotations, mypy/pyright type checkingtype annotations, mypy/pyright type checking

Status: Open.

#27396 In pandas-dev/pandas;

· simonjayhawkins opened on Jul 15, 2019

10 comments