BUG: DataFrameGroupBy.transform with axis=1 fails Apply Bug Groupby good first issue

#36308 opened Sep 12, 2020 by rhshadrach

4

CLN remove unnecessary trailing commas to get ready for new version of black Clean good first issue

#35925 opened Aug 27, 2020 by MarcoGorelli

18

DOC: `.str.cat` output in case of `Index` object Docs good first issue

#35556 opened Aug 4, 2020 by galipremsagar

5

ASV: asvs for DataFrame.values, to_numpy Benchmark good first issue

#35023 opened Jun 26, 2020 by jbrockmendel

12

BUG: Inconsistent behavior for df.replace over pd.Period columns Needs Tests Period good first issue

#34871 opened Jun 19, 2020 by justinessert

6

ENH: Support Multi-Index for columns in parquet format Enhancement IO Parquet good first issue

#34777 opened Jun 14, 2020 by yohplala

4

TST: split up tests/plotting/test_frame.py into subdir & modules Testing Visualization good first issue

#34769 opened Jun 14, 2020 by jreback

5

CLN: remove `private_key` and `verbose` from gbq Clean IO Google good first issue

#34640 opened Jun 8, 2020 by charlesdong1991

4

BUG: DataFrame.apply(raw=True) applies function twice on first row/column Needs Tests good first issue

#34506 opened May 31, 2020 by alonme

9

TST: use ensure_clean rather than explicit os.remove IO Excel Testing good first issue

#34384 opened May 26, 2020 by jreback

2

CI: Linting errors from flake >= 3.8.1 CI Style good first issue

#34150 opened May 13, 2020 by mgmarino

7

CI/TST: slow tests Performance Testing good first issue

#34131 opened May 12, 2020 by jreback

7

DOC: Single Document For Code Guidelines Docs Style good first issue

#33851 opened Apr 28, 2020 by Stockfoot

16

CLN remove unreachable code in pandas/core/groupby/generic.py::DataFrameGroupBy::_wrap_applied_output good first issue

#33478 opened Apr 11, 2020 by MarcoGorelli

19

Histogram or kde from datetime column Enhancement Visualization good first issue

#32590 opened Mar 10, 2020 by JulianWgs

8

Fix capitalization among headings in documentation files Docs good first issue

#32550 opened Mar 9, 2020 by tonywu1999

29

TypeError: cannot do label indexing on <class 'pandas.core.indexes.base.Index'> with these indexers [nan] of <class 'float'> Needs Tests good first issue

#32431 opened Mar 4, 2020 by kzhui125

7

pandas1.0.1 has trouble with certain column names Needs Tests good first issue

#32409 opened Mar 3, 2020 by jeremy-rutman

11

DOC: Standardize references to pandas in the documentation Docs good first issue

#32316 opened Feb 28, 2020 by mroeschke

8

CI: Notifications when a job in GitHub Actions fails CI good first issue

#32301 opened Feb 27, 2020 by datapythonista

6

Plotting Int64 columns with nulled integers (NAType) fails Bug NA - MaskedArrays Visualization good first issue

#32073 opened Feb 18, 2020 by Khris777

15

BUG: "cannot reindex from duplicate axis" thrown using unique indexes, duplicated column names and a specific numpy array values Needs Tests good first issue

#31954 opened Feb 13, 2020 by igorluppi

25

Errors in pandas._libs.lib.maybe_convert_objects leading to use of uninitialized memory NA - MaskedArrays Needs Tests good first issue

#31944 opened Feb 13, 2020 by ahmadia

7

BUG: segmentation fault with pd.NA and np.ndarray.__contains__ Needs Tests good first issue

#31922 opened Feb 12, 2020 by jorisvandenbossche

4

Assigned conversion via loc to Int64 fails under peculiar conditions ExtensionArray NA - MaskedArrays Needs Tests good first issue

#31861 opened Feb 10, 2020 by shippy

3

BUG: df.to_markdown() with empty frame incorrect output IO Data Needs Tests good first issue

#31771 opened Feb 7, 2020 by ThibTrip

9

Inconsistent kwargs argument 'color' passed to upstream matplotlib plot functions Docs Visualization good first issue

#31691 opened Feb 5, 2020 by xuancong84

10

Index.sort_values puts missing values at the start with ascending=False API - Consistency Index Missing-data good first issue

#31220 opened Jan 22, 2020 by TomAugspurger

2

[Good first issue] TST: Disallow bare pytest.raises Style Testing good first issue

#30999 opened Jan 14, 2020 by MomIsBestFriend

42

DOC: Remove tips and tricks section page from the wiki Clean Docs good first issue

#30964 opened Jan 13, 2020 by datapythonista

11

BUG: Datetimelike equality comparisons with Categorical Needs Tests good first issue

#30699 opened Jan 4, 2020 by jschendel

11

Move 'For Developers' content from wiki to contributing docs. Docs good first issue

#30232 opened Dec 12, 2019 by simonjayhawkins

14

MultiIndex-Columns Integer and String: Column level 1 not accessable after a using append multiple times Needs Tests good first issue

#29699 opened Nov 18, 2019 by Alrik-star

3

CI: Speed up coverage tests by splitting files CI Testing good first issue

#29671 opened Nov 17, 2019 by datapythonista

16

HDF file compression not working IO HDF5 good first issue

#29310 opened Oct 31, 2019 by WuraolaOyewusi

20

CI/TST: Better information about the tests in azure-pipelines CI good first issue

#29214 opened Oct 25, 2019 by datapythonista

4

Improve docs on what the axis= kwarg does in individual functions/methods Docs good first issue

#29203 opened Oct 24, 2019 by dlukes

9

Misleading error messages when opening inexistent json file Enhancement Error Reporting IO JSON good first issue

#29102 opened Oct 19, 2019 by datapythonista

7

Pandas wrongly read csr_matrix with explicit 0 Needs Tests good first issue

#28992 opened Oct 15, 2019 by PrimozGodec

5

Masking broken (or at least different) for Int64 Series Bug ExtensionArray Indexing Needs Tests good first issue

#28928 opened Oct 11, 2019 by vanschelven

4

Fix mypy errors for pandas\tests\* Typing good first issue

#28926 opened Oct 11, 2019 by simonjayhawkins

20

DOC: Fix SA04 errors in docstrings Docs good first issue

#28792 opened Oct 4, 2019 by ChiefMilesEdgeworth

12

Deprecate using `xlrd` engine in favor of openpyxl Deprecate IO Excel good first issue

#28547 opened Sep 20, 2019 by WillAyd

17

Better Message for xlrd Dependencies Enhancement Error Reporting IO Excel good first issue

#28546 opened Sep 20, 2019 by WillAyd

23

Add base test for ExtensionArray.astype and copy ExtensionArray good first issue

#28488 opened Sep 17, 2019 by TomAugspurger

14

Categorical equality with NaN behaves unexpectedly Needs Tests good first issue

#28384 opened Sep 11, 2019 by ageorgou

6

Various methods don't call call __finalize__ Reshaping good first issue metadata

#28283 opened Sep 4, 2019 by TomAugspurger

15

DOC: Fix formatting errors in docstrings Docs good first issue

#27977 opened Aug 17, 2019 by datapythonista

8

Fix PR02 issues in docstrings Clean Docs good first issue

#27976 opened Aug 17, 2019 by datapythonista

8

CategoricalDtype.update_dtype fails with Categorical Needs Tests good first issue

#27338 opened Jul 11, 2019 by WillAyd

8

groupby/apply behaves different if a column is timezone-aware or not Groupby Needs Tests good first issue

#27212 opened Jul 3, 2019 by jordansamuels

5

DOC: Parameters name and fastpath of Series are not documented Docs good first issue

#27178 opened Jul 2, 2019 by timhoffm

3

TST: Split test_offsets.py Frequency Refactor Testing good first issue

#27085 opened Jun 27, 2019 by mroeschke

6

DOC: Fix docstring quotes in pandas.tseries Docs good first issue

#26982 opened Jun 21, 2019 by datapythonista

4

Groupby indices error with datetime categorical Needs Tests good first issue

#26859 opened Jun 14, 2019 by alexifm

4

Add more pytest idiom to io.excel testing Clean IO Excel Master Tracker Testing good first issue

#26784 opened Jun 11, 2019 by simonjayhawkins

6

Recommended way to check for sparse data (DataFrame or Series) Enhancement Sparse good first issue

#26706 opened Jun 7, 2019 by jorisvandenbossche

33

Improve docs for pandas_version in Dataframe to_json(orient='table') Docs IO JSON good first issue

#26637 opened Jun 3, 2019 by shsnyder

6

DataFrame.apply returns Series of type object instead of correct dtype Needs Tests good first issue

#26223 opened Apr 26, 2019 by jrbrodie77

6

AWS_S3_HOST environment variable no longer available Docs good first issue

#26195 opened Apr 23, 2019 by jakobkogler

4

groupby apply failed on dataframe with DatetimeIndex Needs Tests good first issue

#26182 opened Apr 22, 2019 by goldenbull

7

expanding(min_periods=N).count(), for any N, returns same result as expanding(min_periods=1).count() Needs Tests good first issue

#25857 opened Mar 24, 2019 by magicmathmandarin

4

Series.update fails with categorical types Needs Tests good first issue

#25744 opened Mar 16, 2019 by AlexRiina

8

Fix validation error type `PR02` and check in CI CI Docs Style good first issue

#25376 opened Feb 19, 2019 by MarckK

8

Fix validation error type `SA04` and check in CI CI Docs Style good first issue

#25337 opened Feb 15, 2019 by MarckK

2

Fix validation error type `GL01` and check in CI CI Docs Style good first issue

#25324 opened Feb 14, 2019 by MarckK

4

Fix validation error type `SS03` and check in CI CI Docs Style good first issue

#25306 opened Feb 13, 2019 by MarckK

5

Fix validation error type `PR08` and check in CI CI Docs Style good first issue

#25232 opened Feb 8, 2019 by MarckK

3

DOC: DataFrame.mask() uses df.where in the examples section Docs good first issue

#25187 opened Feb 6, 2019 by miguelfg

3

Fix validation error type `SS02` and check in CI CI Docs Style good first issue

#25113 opened Feb 3, 2019 by kynan

3

Fix validation error type `GL04` and check in CI Docs good first issue

#25106 opened Feb 3, 2019 by kynan

4

SparseDataFrame.to_coo does not convert the default fill value when is not 0 Error Reporting Missing-data Sparse good first issue

#24817 opened Jan 17, 2019 by gm-spacagna

9

Examples for Series ops should be specific to each method. Docs good first issue

#24589 opened Jan 3, 2019 by timgeb

12

ENH: add asv's which include EAs where appropriate ExtensionArray Performance good first issue

#24351 opened Dec 19, 2018 by jreback

5

sort_index not sorting when multi-index made by different categorical types Needs Tests good first issue

#24271 opened Dec 13, 2018 by wiso

3

DOC: scripts/validate_docstrings.py should clean up files created from docstrings Docs good first issue

#24209 opened Dec 10, 2018 by mroeschke

9

step option does not work for hist Needs Tests Visualization good first issue

#23992 opened Nov 29, 2018 by orena1

8

BUG: maybe_infer_to_datetimelike incorrect on 2D inputs Needs Tests good first issue

#23988 opened Nov 29, 2018 by jbrockmendel

4

Series to_json Docstring Updates Docs IO JSON good first issue

#23584 opened Nov 8, 2018 by notnami

13

Weekmask & holidays error in CustomBusinessHour Needs Tests good first issue

#23542 opened Nov 7, 2018 by mnpica

3

Can't combine DatetimeIndex MultiIndex with numeric MultiIndex Needs Tests good first issue

#23478 opened Nov 4, 2018 by nackerley

3

reorder_categories() on categorical index of interval values produces bizarre results Needs Tests good first issue

#23452 opened Nov 1, 2018 by tmelconian

2

pandas.cut: the 'include_lowest' argument isn't behaving as documented Docs good first issue

#23164 opened Oct 15, 2018 by evarga

5

DOC: Generating docs doesn't work if path has whitespaces Docs good first issue

#22836 opened Sep 26, 2018 by datapythonista

15

TST: test that operations with Series(ExtensionArray) and list-likes work ExtensionArray Needs Tests good first issue

#22606 opened Sep 5, 2018 by jorisvandenbossche

4

Grouping-aggregation with first() discards categoricals column Needs Tests good first issue

#22512 opened Aug 26, 2018 by zoquda

7

DOC: ongoing fixing of doctests Docs good first issue

#22459 opened Aug 22, 2018 by jorisvandenbossche

5

low_memory=True in read_csv leads to non documented, silent errors Docs Error Reporting IO CSV good first issue

#22194 opened Aug 3, 2018 by diegoquintanav

5

Series with dtype=object does unexpected type conversion Needs Tests good first issue

#21881 opened Jul 12, 2018 by AllenDowney

4

ENH/API: allow different values for labels/index in DF.reindex __OR__ raise error Error Reporting good first issue

#21685 opened Jun 29, 2018 by h-vetinari

11

BUG: Pandas groupby datetime and column then apply generates ValueError Needs Tests good first issue

#21651 opened Jun 27, 2018 by ginward

9

Tick DateOffset Normalize whatsnew entry has an error Docs good first issue

#21564 opened Jun 20, 2018 by TomAugspurger

13

DOC: Implement script to validate list indentation in docs CI Docs Style good first issue

#21520 opened Jun 18, 2018 by datapythonista

5

CI: Enable spellcheck in docbuild CI Docs good first issue

#21354 opened Jun 7, 2018 by TomAugspurger

5

Add Timedelta Support to JSON Reader with orient="table" Enhancement IO JSON good first issue

#21140 opened May 20, 2018 by WillAyd

4

(Further) clarify documentation for display.precision Docs good first issue

#21004 opened May 10, 2018 by dmolesUC

1

Creating DataFrame throws: data type "bytes512" not understood Needs Tests good first issue

#20734 opened Apr 18, 2018 by stephenmartindale

8

data frame group by with extra categorical column aggregates datetime64 NaT column to float NaN Needs Tests good first issue

#20520 opened Mar 28, 2018 by mathiasdiez

3

Local PostgreSQL faliures CI IO SQL Testing Unreliable Test good first issue

#20505 opened Mar 27, 2018 by TomAugspurger

10

Move Wiki testing page to main docs? Docs good first issue

#20501 opened Mar 27, 2018 by TomAugspurger

3

issue when shifting with Timedelta in a groupby Docs Frequency Groupby Missing-data Resample good first issue

#20492 opened Mar 26, 2018 by randomgambit

11

DOC: add ibis to pandas ecosystem Docs good first issue

#20483 opened Mar 25, 2018 by jreback

5

BUG: DataFrame/Series.loc improperly allows lookups of boolean labels/slices Needs Tests good first issue

#20432 opened Mar 21, 2018 by jschendel

4

Inconsistent groupby-apply output shape and random values returned. Needs Tests good first issue

#20420 opened Mar 20, 2018 by jipibelanger

2

Raise ValueError When Attempting to Rank Object Dtypes Error Reporting Groupby good first issue

#19560 opened Feb 7, 2018 by WillAyd

14

Shortcut functions in transform are not grouped Needs Tests good first issue

#19354 opened Jan 22, 2018 by DiegoAlbertoTorres

3

Series[offsets] + Series[datetime64] fails Needs Tests good first issue

#19211 opened Jan 12, 2018 by jbrockmendel

5

"is_all_dates" inconsistent across datetimelike types API Design Bug Dtypes Period Timedelta Timeseries good first issue

#19204 opened Jan 12, 2018 by toobaz

4

TypeError in Index.get_indexer_non_unique if Index.is_all_dates Needs Tests good first issue

#19187 opened Jan 11, 2018 by toobaz

6

Document our pytest fixtures Docs Testing good first issue

#19159 opened Jan 9, 2018 by TomAugspurger

16

reset_index() doesn't work with CategoricalIndex columns API Design Categorical Docs Dtypes good first issue

#19136 opened Jan 8, 2018 by Stanpol

11

Raise ValueError for read_json and orient='table' With Numeric Column Names Enhancement Error Reporting IO JSON good first issue

#19129 opened Jan 8, 2018 by WillAyd

14

BUG: Creating Index name using `names` names argument, doesn't set index name Docs MultiIndex good first issue

#19082 opened Jan 4, 2018 by jsnowacki

5

Category type is discarded with `where` series method Needs Tests good first issue

#18888 opened Dec 21, 2017 by andrewdalecramer

2

DOC: improve docs for broadcasting behavior Docs Indexing Numeric good first issue

#18857 opened Dec 19, 2017 by jakevdp

12

asv tests for DataFrame constructor Benchmark good first issue

#18840 opened Dec 19, 2017 by toobaz

2

Groupby with function returning a tuple fails if index has a name Docs Groupby good first issue

#18696 opened Dec 8, 2017 by achabotl

7

BUG: boolean frames multiplied by floats have dtypes=object Needs Tests good first issue

#18549 opened Nov 28, 2017 by erbian

6

KeyError when calling to_coo() on SparseDataFrame Bug Sparse good first issue

#18414 opened Nov 21, 2017 by ediphy-azorab

5

Reading a SAS file with 0 rows gives None Bug Error Reporting IO SAS good first issue

#18198 opened Nov 9, 2017 by AbdealiJK

8

BENCH: Index.take benchmark is measuring wrong thing Benchmark good first issue

#18000 opened Oct 27, 2017 by jorisvandenbossche

3

DOC: Order of groups in groupby and head method Docs Groupby good first issue

#17775 opened Oct 4, 2017 by jmcarcell

4

DOC: nice links / examples for setting with copy & aggregation Docs good first issue

#17505 opened Sep 13, 2017 by jreback

2

PERF: to_datime fastpath for %Y%m%d is slower Performance Timeseries good first issue

#17410 opened Sep 1, 2017 by jorisvandenbossche

7

Already tz-aware when reading hdf5 generated by Python2 in Python3 2/3 Compat Needs Tests good first issue

#17145 opened Aug 1, 2017 by Denisevi4

7

still doesn't work with boto3 StreamingBody Needs Tests good first issue

#17135 opened Aug 1, 2017 by uiur

13

DOC: use shared_docs for isna/notna & isnull/notnull Docs good first issue

#17096 opened Jul 27, 2017 by jreback

9

The groupby filter output differs if we run an aggregate function before Bug Groupby Needs Tests good first issue

#17091 opened Jul 27, 2017 by arnaudlegout

5

DOC: section on caveats of storing lists inside DataFrame/Series Docs good first issue

#17027 opened Jul 19, 2017 by chris-b1

12

Bug: CustomBusinessHour bug with holidays Needs Tests good first issue

#16867 opened Jul 10, 2017 by ustcscgyer

5

Scatter plot with colour_by and size_by variables Docs Visualization good first issue

#16827 opened Jul 5, 2017 by nipunbatra

9

BUG: to_latex with multicolumn and multiindex joins cells which are on different hierarchy levels Needs Tests good first issue

#16719 opened Jun 18, 2017 by wlter

5

inplace kwarg must be of bool type, but other boolean kwargs don't have this restriction API - Consistency Enhancement Error Reporting good first issue

#16714 opened Jun 16, 2017 by colinmorris

6

DOC: pivot function Docs good first issue

#16578 opened Jun 2, 2017 by jesrael

4

Non-inclusive partial string indexing on DatetimeIndex Docs Indexing Timeseries good first issue

#16571 opened Jun 1, 2017 by linar-jether

6

Importing pandas module breaks expected behavior of Thread[ed] script Needs Tests good first issue

#16544 opened May 31, 2017 by christian-eriksson

5

DOC: add section on Interval Docs Interval good first issue

#16400 opened May 20, 2017 by jreback

5

pd.crosstab, categorical data and missing instances Bug Categorical Regression Reshaping good first issue

#16367 opened May 16, 2017 by peisenha

12

Column loses category when using .loc for a one row dataframe Needs Tests good first issue

#16360 opened May 15, 2017 by nyejon

4

Documentation on Performance considerations Docs Performance good first issue

#16310 opened May 9, 2017 by Dr-Irv

3

Wrong error message in HDFStore.append when appending dataframe with None item in previously string-only column Enhancement Error Reporting IO HDF5 good first issue

#16300 opened May 9, 2017 by toobaz

6

Incorrect parsing of UTF-16 TSV if file includes Unicode 'FULLWIDTH COLON' (U+FF1A) Needs Tests good first issue

#16218 opened May 3, 2017 by ecwootten

3

DataFrame.groupby().std() fails on filtered DataFrame Needs Tests good first issue

#16174 opened Apr 29, 2017 by edhalter

5

no warning with invalid pd.set_option('display.max_colwidth') Enhancement Error Reporting Output-Formatting good first issue

#16097 opened Apr 22, 2017 by jkornblum

5

API: to_datetime with ordinals and no unit API Design Bug Needs Discussion Timeseries good first issue

#15836 opened Mar 29, 2017 by chris-b1

8

BUG: out-of-bounds datetime parsing Needs Tests good first issue

#15829 opened Mar 29, 2017 by jreback

13

Make pd.set_eng_float_format() into proper pandas.options.display option Docs Needs Discussion good first issue

#15610 opened Mar 8, 2017 by zertrin

8

DOC: inconsistent docs-string signatures for shared functions Docs good first issue

#15609 opened Mar 7, 2017 by jreback

6

DOC: overall improvement of docstrings Docs good first issue

#15580 opened Mar 5, 2017 by jorisvandenbossche

10

cannot get cut() to display desired bins label Docs Numeric good first issue

#15357 opened Feb 9, 2017 by qAp

5

CustomBusinessMonthBegin offset parameter Needs Tests good first issue

#14869 opened Dec 12, 2016 by LingnanLemon

2

Series values cannot be accessed by numeric categorical index Bug Categorical Indexing good first issue

#14865 opened Dec 12, 2016 by alex-filatov

24

Multiarray searchsorted fails Error Reporting MultiIndex good first issue

#14833 opened Dec 8, 2016 by Anaphory

12

DOC: min_itemsize for HDFStore append for encoded strings Docs IO HDF5 Usage Question good first issue

#14601 opened Nov 7, 2016 by johanneshk

6

PERF: asv for select_dtypes Dtypes Performance good first issue

#14588 opened Nov 4, 2016 by simonm3

5

BUG: inconsistencies/errors in quantile on empty DataFrame Needs Tests good first issue

#14564 opened Nov 2, 2016 by jorisvandenbossche

3

ENH: add np.nan* functions to map for groupby/rolling/resample aggregators Enhancement Groupby Resample Window good first issue

#14518 opened Oct 27, 2016 by jreback

4

DOC: clarify dangers of fast apply in GroupBy apply docs Docs Groupby good first issue

#14180 opened Sep 7, 2016 by tambu-j

2

TST/CLN: some RunTimeWarnings Clean Testing good first issue

#14057 opened Aug 21, 2016 by jreback

7

BUG: unstack doesn't preserve categorical dtype Needs Tests good first issue

#14018 opened Aug 16, 2016 by pijucha

10

DOC: more documentation that pandas by-default aligns when setting Docs Indexing Usage Question good first issue

#13950 opened Aug 9, 2016 by IamGianluca

2

ERR: Categoricals should not allow non-strings when an object dtype is passed Categorical Enhancement Error Reporting IO HDF5 good first issue

#13919 opened Aug 5, 2016 by hnykda

11

ERR: more informative error messages on invalid freq for Period when they are point-in-time Enhancement Error Reporting Frequency good first issue

#13871 opened Aug 1, 2016 by agraboso

3

ENH: df.add fill_value NotImplementedError Enhancement Missing-data Numeric Reshaping good first issue

#13488 opened Jun 19, 2016 by neverforgit

3

BUG/API: PeriodIndex doesn't support loc using partial string Needs Tests good first issue

#13429 opened Jun 12, 2016 by sinhrks

6

BUG: duplicate indexing on non-integer index with positional indexers failing in py3 Needs Tests good first issue

#13427 opened Jun 11, 2016 by alexanderwhatley

6

pd.Period off by hundred of years for dates past ~2263 Needs Tests Period good first issue

#13346 opened Jun 1, 2016 by eyurtsev

13

DOC: sas & R functionaility Docs IO SAS good first issue

#13229 opened May 19, 2016 by jreback

2

DOC: floating point precision on writing/reading to csv Docs good first issue

#13159 opened May 12, 2016 by FBartlett

4

BUG: PeriodIndex construction fails (or produces erroneous result) with memoryview as input. Needs Tests good first issue

#13120 opened May 9, 2016 by ssanderson

14

ERR: warning on merging on unequal levels for an Index Bug Error Reporting Reshaping good first issue

#13094 opened May 5, 2016 by l736x

6

Slicing on DatetimeIndex throws KeyError: [int] not found Error Reporting Indexing Timeseries good first issue

#13090 opened May 5, 2016 by twiecki

7

Unable to read MultiIndex columns from CSV if empty levels IO CSV MultiIndex good first issue

#13054 opened May 2, 2016 by jluttine

11

Improve type handling in read_sql and read_sql_table Dtypes Enhancement IO SQL good first issue

#13049 opened May 1, 2016 by rsdenijs

12

COMPAT: should an empty string match a format (or just be NaT) Needs Tests good first issue

#13044 opened Apr 30, 2016 by jreback

2

cross section coercion with output iterating API Design Dtypes Needs Discussion good first issue

#12859 opened Apr 11, 2016 by tsu-shiuan

9

ENH: cumcount() for DataFrames and Series API Design Enhancement good first issue

#12648 opened Mar 16, 2016 by johne13

39

TST: code coverage enhancements CI Testing good first issue

#12634 opened Mar 15, 2016 by jreback

3

append a categorical with different categories to the existing Categorical Docs good first issue

#12509 opened Mar 2, 2016 by dneise

3

Error Creating DataFrame with Single MultiIndexed Column Constructors Error Reporting good first issue

#12457 opened Feb 26, 2016 by woztheproblem

20

Categorical data not supported in plots of parallel coordinates Enhancement Visualization good first issue

#12341 opened Feb 16, 2016 by tantrev

14

pivot_table throws exception with multiple aggregations per column and margins=True Bug Reshaping good first issue

#12210 opened Feb 2, 2016 by grutts

14

"min_itemsize" doesn't work for MultiIndex columns in table format Bug IO HDF5 good first issue

#12154 opened Jan 27, 2016 by toobaz

8

Docstring on Styler.apply{,map} is confusing Docs IO HTML good first issue

#12148 opened Jan 26, 2016 by pwaller

5

BUG: Categorical repr can exceed options.display.width Bug Output-Formatting good first issue

#12066 opened Jan 17, 2016 by wesm

4

BUG: MultiIndex.set_names loses name API Design Bug MultiIndex good first issue

#11979 opened Jan 7, 2016 by TomAugspurger

7

ENH: other plotting tools via plot accessor Visualization good first issue

#11978 opened Jan 7, 2016 by rhiever

15

API: expose pd.to_time API Design Enhancement Timeseries good first issue

#11947 opened Jan 3, 2016 by jreback

2

Dataframe loading with duplicated columns and usecols Docs IO CSV good first issue

#11823 opened Dec 11, 2015 by thenx

19

to_csv locale dependent float_format Bug IO CSV good first issue

#11812 opened Dec 10, 2015 by Winand

6

ENH: calculate average absolute difference by mean, median or mode API Design Numeric good first issue

#11787 opened Dec 7, 2015 by aechase

12

HTML styling set_precision should take subset Bug IO HTML Output-Formatting good first issue

#11656 opened Nov 20, 2015 by mattilyra

6

Misaligned shared axes between timeseries plots of different frequency. Needs Tests good first issue

#11574 opened Nov 11, 2015 by juseg

3

DOC: add axes attributes to API docs Docs good first issue

#11407 opened Oct 22, 2015 by jreback

6

API: consider deprecating DataFrame.hist in favor of DataFrame.plot.hist Deprecate Visualization good first issue

#11053 opened Sep 10, 2015 by shoyer

12

DOC: document optional arguments on plot submethods Docs Visualization good first issue

#11042 opened Sep 10, 2015 by shoyer

1

read_sql should accept a sql_params parameter Docs IO SQL good first issue

#10899 opened Aug 24, 2015 by scls19fr

10

PERF: follow up to ASV Performance good first issue

#10849 opened Aug 19, 2015 by jreback

12

API: DatetimeIndex / TimedeltaIndex 2d slicing should result in Index Enhancement Error Reporting Index good first issue

#10774 opened Aug 9, 2015 by sinhrks

5

DEPR: DataFrame.combine propagates nan values Deprecate Missing-data good first issue

#10734 opened Aug 3, 2015 by aktiur

17

DOC/ERR: better error message on unsuccessful datetime parsing Enhancement Error Reporting Timeseries good first issue

#10720 opened Aug 1, 2015 by jreback

14

DOC: splitting the IO docs into separate pages Docs good first issue

#10446 opened Jun 26, 2015 by jorisvandenbossche

1

Improve documentation for piecewise_polynomial interpolation Docs Missing-data good first issue

#10365 opened Jun 16, 2015 by cancan101

1

Aligning on multi-index with swapped levels gives unclear error message Error Reporting Indexing Reshaping good first issue

#9952 opened Apr 20, 2015 by jorisvandenbossche

5

BUG: index name lost when indexing with another index Bug Indexing Reshaping good first issue

#9943 opened Apr 20, 2015 by sergeny

7

DOC: consistent imports ('import pandas as pd' et al) Docs good first issue

#9886 opened Apr 13, 2015 by jorisvandenbossche

12

API: timeseries accessors naming convention API Design Timeseries good first issue

#9606 opened Mar 6, 2015 by jreback

1

API: read_csv,from_csv/to_csv keyword consistency API - Consistency Deprecate IO CSV good first issue

#9568 opened Mar 1, 2015 by rmorgans

12

With an external grouper, there is no way to access the grouped value in a DataFrame(...).groupby(...).apply(...) workflow API Design Docs Groupby good first issue

#9545 opened Feb 24, 2015 by brianthelion

10

Implement high performance rolling_rank Numeric Performance good first issue

#9481 opened Feb 13, 2015 by PH82

20

ENH: support index=True for SQL io.sql.get_schema Enhancement IO SQL good first issue

#9084 opened Dec 15, 2014 by jorisvandenbossche

2

API: Index should support __inverse__ ops Needs Tests good first issue

#8875 opened Nov 22, 2014 by sinhrks

8

DOC/BUG? pivot functionality confusing/inconsistent Docs Reshaping good first issue

#8160 opened Sep 2, 2014 by seth-p

2

Regression in casting Series to DataFrame with .name='foo' and columns=['bar'] Constructors Needs Tests good first issue

#7893 opened Jul 31, 2014 by qwhelan

7

BUG: DataFrame quantile with only datetime dtypes should provide better error message Needs Tests good first issue

#7308 opened Jun 2, 2014 by TomAugspurger

3

DOC: improve groupby reference docs Docs Groupby Master Tracker good first issue

#6944 opened Apr 23, 2014 by jorisvandenbossche

4

BUG: setitem with at not inferring dtype correctly Needs Tests good first issue

#6942 opened Apr 23, 2014 by jreback

6

DOC: provide more inline examples for cookbook.rst Docs good first issue

#6918 opened Apr 21, 2014 by jreback

3

DOC: freeze old whatsnew notes? Docs good first issue

#6856 opened Apr 10, 2014 by jorisvandenbossche

11

DOC: update groupby NA group handing / workaround Docs Groupby good first issue

#5456 opened Nov 6, 2013 by mkeller-upb

5

DOC: More subtotals / margins in pivot_table Docs Reshaping good first issue

#4817 opened Sep 11, 2013 by hayd

7

Give the merge copy parameter better documentation Docs good first issue

#4599 opened Aug 18, 2013 by cpcloud

6

DOC: Unclear documentation for Period Construction Docs Frequency good first issue

#4591 opened Aug 17, 2013 by cancan101

2

Grid=True option in plot functions overrides user settings Docs Visualization good first issue

#3188 opened Mar 27, 2013 by mangecoeur

6