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Concatting dense and sparse dataframes breaks many common operations

ReshapingConcat, Merge/Join, Stack/Unstack, ExplodeConcat, Merge/Join, Stack/Unstack, Explode

SparseSparse Data TypeSparse Data Type

Status: Closed (completed).

#16874 In pandas-dev/pandas;

· by kbattocchi was closed on Feb 1, 2018

Preserve subclass family on reshape operations

API Design

ReshapingConcat, Merge/Join, Stack/Unstack, ExplodeConcat, Merge/Join, Stack/Unstack, Explode

SubclassingSubclassing pandas objectsSubclassing pandas objects

Status: Closed (completed).

#15563 In pandas-dev/pandas;

· by delgadom was closed on Jan 12, 2018

Unary plus missing for Series and DataFrame

Compatpandas objects compatability with Numpy or Python functionspandas objects compatability with Numpy or Python functions

Enhancement

good first issue

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

Status: Closed (completed).

#16073 In pandas-dev/pandas;

· by RhysU was closed on Feb 8, 2018

qcut: Using cut with IntervalIndex provided by qcut producing wrong NaN values

Bug

ReshapingConcat, Merge/Join, Stack/Unstack, ExplodeConcat, Merge/Join, Stack/Unstack, Explode

Status: Closed (completed).

#17284 In pandas-dev/pandas;

· by prcastro was closed on May 5, 2018

Improve the error message when <code>usecols</code> cannot match all columns

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

IO CSVread_csv, to_csvread_csv, to_csv

Status: Closed (completed).

#17301 In pandas-dev/pandas;

· by AaronCritchley was closed on Dec 3, 2017

ENH: Improve error message when using DataFrame.from_items instead of DataFrame.from_records

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

good first issue

Status: Closed (completed).

#17312 In pandas-dev/pandas;

· by wesm was closed on Nov 26, 2017

Make <code>DataFrame.pivot</code> accepts a list of column names as values

Enhancement

good first issue

ReshapingConcat, Merge/Join, Stack/Unstack, ExplodeConcat, Merge/Join, Stack/Unstack, Explode

Status: Closed (completed).

#17160 In pandas-dev/pandas;

· by dclong was closed on Mar 26, 2018

indexing.py: "'bool' object has no attribtute 'any'" with duplicate time index

Bug

IndexingRelated to indexing on series/frames, not to indexes themselvesRelated to indexing on series/frames, not to indexes themselves

Status: Closed (completed).

#17105 In pandas-dev/pandas;

· by elDan101 was closed on May 8, 2018

API: deprecate DataFrame.from_items ?

API Design

DeprecateFunctionality to remove in pandasFunctionality to remove in pandas

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

Status: Closed (completed).

#17320 In pandas-dev/pandas;

· by chris-b1 was closed on Jan 31, 2018

Strange behaviour when trying to create a series from two columns of a dataframe with apply(tuple, axis=1)

ApplyApply, Aggregate, Transform, MapApply, Aggregate, Transform, Map

Bug

Status: Closed (completed).

#17348 In pandas-dev/pandas;

· by daltschu was closed on Feb 7, 2018

ENH: to_json(index=False)

API Design

Enhancement

IO JSONread_json, to_json, json_normalizeread_json, to_json, json_normalize

Status: Closed (completed).

#17394 In pandas-dev/pandas;

· by Suor was closed on Dec 10, 2017

.loc assignment of pd.Timestamp to Series of dtype object results in cast to Long

Bug

Dtype ConversionsUnexpected or buggy dtype conversionsUnexpected or buggy dtype conversions

Duplicate ReportDuplicate issue or pull requestDuplicate issue or pull request

IndexingRelated to indexing on series/frames, not to indexes themselvesRelated to indexing on series/frames, not to indexes themselves

Status: Closed (completed).

#15526 In pandas-dev/pandas;

· by joseortiz3 was closed on Mar 9, 2018

BUG: dt.strftime causes TypeError when there is only one row in DataFrame

Bug

Dtype ConversionsUnexpected or buggy dtype conversionsUnexpected or buggy dtype conversions

IndexingRelated to indexing on series/frames, not to indexes themselvesRelated to indexing on series/frames, not to indexes themselves

Status: Closed (completed).

#15494 In pandas-dev/pandas;

· by yp514 was closed on Jan 10, 2018

DOC: Dataframe.apply does not always return a Series when reduce=True

ApplyApply, Aggregate, Transform, MapApply, Aggregate, Transform, Map

Docs

ReshapingConcat, Merge/Join, Stack/Unstack, ExplodeConcat, Merge/Join, Stack/Unstack, Explode

Status: Closed (completed).

#15628 In pandas-dev/pandas;

· by NelsonAndrew was closed on Feb 7, 2018

Pandas (0.18) Rank: unexpected behavior for method = 'dense' and pct = True

AlgosNon-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diffNon-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diff

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

Status: Closed (completed).

#15630 In pandas-dev/pandas;

· by FXLab91 was closed on Mar 9, 2018

DOC: enable parallel building of the docs

Docs

Status: Closed (completed).

#15591 In pandas-dev/pandas;

· by jorisvandenbossche was closed on Feb 22, 2018

CLN: make _Indexer.obj a weak ref

Clean

InternalsRelated to non-user accessible pandas implementationRelated to non-user accessible pandas implementation

Status: Closed (completed).

#15746 In pandas-dev/pandas;

· by jreback was closed on Oct 27, 2017

Boolean operations in groupby objects are extremely slow compared to numpy counterpart.

Groupby

PerformanceMemory or execution speed performanceMemory or execution speed performance

Status: Closed (completed).

#15435 In pandas-dev/pandas;

· by dsevero was closed on Mar 1, 2018

read_msgpack returns garbage for non-existing files in python2

Bug

good first issue

Status: Closed (completed).

#15296 In pandas-dev/pandas;

· by languitar was closed on Oct 30, 2017

No implicit casting of int -&gt; float on full indexing of multiindex

IndexingRelated to indexing on series/frames, not to indexes themselvesRelated to indexing on series/frames, not to indexes themselves

MultiIndex

RegressionFunctionality that used to work in a prior pandas versionFunctionality that used to work in a prior pandas version

Status: Closed (completed).

#15994 In pandas-dev/pandas;

· by toobaz was closed on Jan 28, 2018

BUG: comparing TZ-aware timestamps to a scalar results in exception

Bug

TimezonesTimezone data dtypeTimezone data dtype

Status: Closed (completed).

#15966 In pandas-dev/pandas;

· by chrisaycock was closed on Nov 8, 2017

BUG: melt changes type of tz-aware columns

Bug

Dtype ConversionsUnexpected or buggy dtype conversionsUnexpected or buggy dtype conversions

ReshapingConcat, Merge/Join, Stack/Unstack, ExplodeConcat, Merge/Join, Stack/Unstack, Explode

TimezonesTimezone data dtypeTimezone data dtype

Status: Closed (completed).

#15785 In pandas-dev/pandas;

· by stigviaene was closed on Mar 13, 2018

PERF: cythonize groupby-rank

Groupby

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

PerformanceMemory or execution speed performanceMemory or execution speed performance

Status: Closed (completed).

#15779 In pandas-dev/pandas;

· by jreback was closed on Feb 10, 2018

Enhancement Request: control extrapolation on .interpolate

API Design

Enhancement

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

Status: Closed (completed).

#16284 In pandas-dev/pandas;

· by WBare was closed on Feb 1, 2018

Can't pd.options.display.max_columns = 0 by default?

Output-Formatting__repr__ of pandas objects, to_string__repr__ of pandas objects, to_string

Status: Closed (completed).

#16579 In pandas-dev/pandas;

· by cbrnr was closed on Jun 2, 2017