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API/REF: consistent error messages, arithmetic rules

API - ConsistencyInternal Consistency of API/Behavior Internal Consistency of API/Behavior

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

Numeric OperationsArithmetic, Comparison, and Logical operations Arithmetic, Comparison, and Logical operations

Status: Open.

#62423 In pandas-dev/pandas;

· jbrockmendel opened on Sep 23, 2025

ENH: arithmetic between DatetimeArray / TimedeltaArray and list

Enhancement

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

Numeric OperationsArithmetic, Comparison, and Logical operations Arithmetic, Comparison, and Logical operations

Status: Open.

#62353 In pandas-dev/pandas;

· cmp0xff opened on Sep 16, 2025

BUG: Inconsistent multiplication of bool times Timedelta

Bug

Numeric OperationsArithmetic, Comparison, and Logical operations Arithmetic, Comparison, and Logical operations

TimedeltaTimedelta data type Timedelta data type

Status: Open.

#62316 In pandas-dev/pandas;

· Dr-Irv opened on Sep 11, 2025

BUG: Implicit upcast to float64 for large series (more than 1000000 rows)

Bug

Dtype ConversionsUnexpected or buggy dtype conversions Unexpected or buggy dtype conversions

Numeric OperationsArithmetic, Comparison, and Logical operations Arithmetic, Comparison, and Logical operations

Status: Open.

#61951 In pandas-dev/pandas;

· stertingen opened on Jul 25, 2025

API: boolean ops with float dtype

API - ConsistencyInternal Consistency of API/Behavior Internal Consistency of API/Behavior

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

Nullable by defaultIssues that would be addressed by moving to nullable-by-default Issues that would be addressed by moving to nullable-by-default

Numeric OperationsArithmetic, Comparison, and Logical operations Arithmetic, Comparison, and Logical operations

Status: Open.

#61881 In pandas-dev/pandas;

· jbrockmendel opened on Jul 16, 2025

BUG: pd.DataFrame.mul has not support fill_value?

Bug

Numeric OperationsArithmetic, Comparison, and Logical operations Arithmetic, Comparison, and Logical operations

Status: Open.

#61581 In pandas-dev/pandas;

· TungPhaSanh opened on Jun 6, 2025

ENH: add <code>__rshift__</code>, <code>__lshift__</code>, <code>__irshift__</code> and <code>__ilshift__</code>

Enhancement

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

Numeric OperationsArithmetic, Comparison, and Logical operations Arithmetic, Comparison, and Logical operations

Status: Open.

#60693 In pandas-dev/pandas;

· luxedo opened on Jan 11, 2025

BUG (string dtype): comparison of string column to mixed object column fails

Bug

Numeric OperationsArithmetic, Comparison, and Logical operations Arithmetic, Comparison, and Logical operations

StringsString extension data type and string data String extension data type and string data

Status: Open.

#60228 In pandas-dev/pandas;

· jorisvandenbossche opened on Nov 7, 2024

·

2.3.3

BUG: Incorrect logical operation between pandas dataframe and series

Bug

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

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

Numeric OperationsArithmetic, Comparison, and Logical operations Arithmetic, Comparison, and Logical operations

Status: Open.

#60204 In pandas-dev/pandas;

· jialuoo opened on Nov 5, 2024

BUG: arithmetic between datetime.timedelta scalar and series produces timedelta64[us] instead of timedelta64[ns]

Bug

Numeric OperationsArithmetic, Comparison, and Logical operations Arithmetic, Comparison, and Logical operations

TimedeltaTimedelta data type Timedelta data type

Status: Open.

#59656 In pandas-dev/pandas;

· sfc-gh-mvashishtha opened on Aug 30, 2024

BUG: some cases of binary arithmetic between string and timedelta raise TypeError

Bug

Numeric OperationsArithmetic, Comparison, and Logical operations Arithmetic, Comparison, and Logical operations

TimedeltaTimedelta data type Timedelta data type

Status: Open.

#59653 In pandas-dev/pandas;

· sfc-gh-mvashishtha opened on Aug 29, 2024

BUG: subtracting datetime series from datetime dataframe, or datetime dataframe from datetime series, raises TypeError or UFuncTypeError

Bug

DatetimeDatetime data dtype Datetime data dtype

Numeric OperationsArithmetic, Comparison, and Logical operations Arithmetic, Comparison, and Logical operations

Status: Open.

#59529 In pandas-dev/pandas;

· sfc-gh-mvashishtha opened on Aug 16, 2024