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GitHub / pandas-dev/pandas issues and pull requests

#24368 - DataFrame constructor with dict of series misbehaving when `columns` specified

Issue - State: closed - Opened by TomAugspurger almost 7 years ago - 3 comments
Labels: Performance, DataFrame, Constructors

#24351 - ENH: add asv's which include EAs where appropriate

Issue - State: closed - Opened by jreback almost 7 years ago - 8 comments
Labels: Benchmark, ExtensionArray

#24278 - Add an "extra info" section to the base ExtensionArray repr

Issue - State: closed - Opened by TomAugspurger almost 7 years ago
Labels: Enhancement, Timeseries, Output-Formatting, ExtensionArray

#24269 - DataFrame.loc/iloc fails to update object with new dtype

Issue - State: open - Opened by TomAugspurger almost 7 years ago - 4 comments
Labels: Bug, Indexing, Dtype Conversions

#24261 - Add ExtensionArray._scalar_from_string

Issue - State: closed - Opened by TomAugspurger almost 7 years ago - 3 comments
Labels: Enhancement, ExtensionArray, Closing Candidate

#24247 - sort_index(..., ascending=False, ...) overrides sort_remaining behavior with multiindex

Issue - State: closed - Opened by alkasm almost 7 years ago - 2 comments
Labels: good first issue, Needs Tests

#24121 - BUG - PeriodIndex.freq.normalize option gets cached per process

Issue - State: closed - Opened by aa1371 almost 7 years ago
Labels: Bug, Frequency, Period

#24064 - TST: Implement tests for Date/TimelikeOps directly on array

Issue - State: closed - Opened by TomAugspurger almost 7 years ago - 4 comments
Labels: Enhancement, Testing, Timeseries, ExtensionArray

#24046 - API: capabilities of df.set_index

Issue - State: open - Opened by h-vetinari almost 7 years ago - 80 comments
Labels: Enhancement

#24020 - Allow dtype promotion in Series[ExtensionArray].__setitem__?

Issue - State: closed - Opened by TomAugspurger almost 7 years ago - 5 comments
Labels: Enhancement, Dtype Conversions, Needs Discussion, ExtensionArray, Closing Candidate

#23977 - (Suggestion) Alert user when passing %p and %H in same format

Issue - State: closed - Opened by MrArca9 almost 7 years ago - 3 comments
Labels: Enhancement, Needs Discussion, Warnings

#23800 - ENH: Add `pd.DataFrame.strformat` method for simplified string series construction

Issue - State: closed - Opened by ms7463 almost 7 years ago - 3 comments
Labels: Enhancement, Strings, Needs Discussion, DataFrame

#23720 - confusing default behavior of print for bound method

Issue - State: closed - Opened by MLopez-Ibanez almost 7 years ago - 4 comments
Labels: Enhancement, Output-Formatting

#23633 - StataWriter for version 117 fails on None in a string column long enough to be a Stata StrL.

Issue - State: closed - Opened by jtkiley almost 7 years ago - 11 comments
Labels: IO Data, IO Stata

#23594 - Add support for extra formats to all .strftime() methods.

Issue - State: open - Opened by ngnpope almost 7 years ago - 2 comments
Labels: Enhancement, Timeseries

#23568 - "RecursionError: maximum recursion depth exceeded while calling a Python object" when using groupby, resample, and agg

Issue - State: open - Opened by trianta2 almost 7 years ago - 4 comments
Labels: Bug, Groupby, Resample, Apply, Closing Candidate

#23458 - DOC: Template Timestamp & NaT docstrings

Issue - State: closed - Opened by mroeschke almost 7 years ago - 4 comments
Labels: Docs, Timeseries

#23412 - ASV: docs, runtime, stability, build acceleration, PR integration?

Issue - State: open - Opened by h-vetinari almost 7 years ago - 5 comments
Labels: Performance, Benchmark

#23362 - PERF: concat perf

Issue - State: open - Opened by TomAugspurger almost 7 years ago - 4 comments
Labels: Performance, Reshaping, Period, Closing Candidate

#23200 - [Proposal] Allow open boundaries when some of them are undefined for DatetimeIndex

Issue - State: closed - Opened by Adirio almost 7 years ago - 5 comments
Labels: Enhancement, Datetime, Needs Discussion

#23164 - pandas.cut: the 'include_lowest' argument isn't behaving as documented

Issue - State: open - Opened by evarga almost 7 years ago - 14 comments
Labels: Docs, Needs Discussion, cut

#23139 - DOC: Implicit parallelism and how to disable it

Issue - State: closed - Opened by stuarteberg almost 7 years ago - 14 comments
Labels: Docs, Multithreading

#23124 - Require the dtype of SparseArray.fill_value and sp_values.dtype to match

Issue - State: closed - Opened by TomAugspurger almost 7 years ago - 8 comments
Labels: Enhancement, Dtype Conversions, Sparse

#23064 - DataFrame merge significantly slower in Python 3.6 and 3.7

Issue - State: closed - Opened by mpeleshenko almost 7 years ago - 13 comments
Labels: Performance, Reshaping, Closing Candidate

#23055 - Converting None values with pandas.to_datetime is unpredictable

Issue - State: closed - Opened by dinya almost 7 years ago - 8 comments
Labels: Bug, Datetime, Missing-data, API - Consistency

#23030 - mssql pandas.DataFrame.to_sql AttributeError: 'Engine' object has no attribute 'cursor'

Issue - State: closed - Opened by philiphoyos almost 7 years ago - 4 comments
Labels: IO SQL

#23002 - ENH: allow rolling with non-numerical (eg string) data

Issue - State: open - Opened by randomgambit almost 7 years ago - 20 comments
Labels: Enhancement, Apply, Window

#22853 - Add chunksize support to to_json

Issue - State: open - Opened by julienfr112 about 7 years ago - 3 comments
Labels: Enhancement, IO JSON

#22843 - ExtensionArray.value_counts

Issue - State: closed - Opened by TomAugspurger about 7 years ago - 10 comments
Labels: Docs, Algos, Deprecate, ExtensionArray

#22836 - DOC: Generating docs doesn't work if path has whitespaces

Issue - State: closed - Opened by datapythonista about 7 years ago - 18 comments
Labels: Docs, good first issue

#22801 - DataFrame.to_dict can result in data loss when indexes are not unique

Issue - State: closed - Opened by TychonautVII about 7 years ago - 5 comments
Labels: Error Reporting, good first issue

#22794 - merge_asof can't handle floats in by column?

Issue - State: closed - Opened by rndeon about 7 years ago - 1 comment
Labels: Bug, Reshaping

#22720 - Reading SAS time variables

Issue - State: open - Opened by sasutils about 7 years ago - 9 comments
Labels: Enhancement, IO SAS

#22668 - Alternative wheel build

Issue - State: closed - Opened by lyssdod about 7 years ago - 14 comments
Labels: Build

#22613 - Series.str.decode() turns arrays of strings to NaN and fails on byte strings

Issue - State: closed - Opened by abrakababra about 7 years ago - 10 comments
Labels: Strings, good first issue, Needs Tests

#22592 - Invitation for comments / use: reading large fixed-width datasets efficiently

Issue - State: closed - Opened by davclark about 7 years ago - 3 comments
Labels: Performance, IO Fixed Width

#22555 - In-memory to_csv compression

Issue - State: closed - Opened by ZaxR about 7 years ago - 12 comments
Labels: Enhancement, IO CSV

#22496 - Add support for "regex" library

Issue - State: open - Opened by pmav99 about 7 years ago - 22 comments
Labels: Enhancement, Strings

#22450 - Timestamp.timestamp() inconsistent with Datetime.timestamp()

Issue - State: closed - Opened by patrickspry about 7 years ago - 6 comments
Labels: Datetime, Compat, Deprecate, Needs Discussion

#22362 - Add "semester" as a time/date component to DatetimeIndex

Issue - State: closed - Opened by Nemecsek about 7 years ago - 5 comments
Labels: Enhancement, Datetime, Frequency

#22257 - get_group(...) fails for groupby(...) based on a function

Issue - State: closed - Opened by Kimonode about 7 years ago - 4 comments
Labels: Bug, Groupby, Regression, MultiIndex, good first issue, Needs Tests

#22247 - MultiIndex Bug Copying Values Incorrectly When Adding Values To Index

Issue - State: closed - Opened by JonahJ about 7 years ago - 4 comments
Labels: good first issue, Needs Tests

#22208 - [Feature Request] Providing a cache option for `pd.read_sql()`

Issue - State: closed - Opened by Ouwen about 7 years ago - 9 comments
Labels: Docs, IO SQL

#22100 - astype not converting timedelta and datetime strings

Issue - State: closed - Opened by fjdiod about 7 years ago - 6 comments
Labels: Bug, Dtype Conversions, Timedelta, Astype

#22040 - Updating value of a single row of a column using loc or at fails

Issue - State: open - Opened by abhinav-upadhyay about 7 years ago - 16 comments
Labels: good first issue, Needs Tests

#22025 - Refactor from_records to load data in an efficient way

Issue - State: open - Opened by datapythonista about 7 years ago - 6 comments
Labels: Refactor, Performance, Constructors

#21998 - ENH: Interval type should support intersection, union & overlaps & difference

Issue - State: open - Opened by haleemur about 7 years ago - 4 comments
Labels: Enhancement, Interval, setops

#21995 - TST: read_csv silently drops empty row

Issue - State: open - Opened by dahlbaek about 7 years ago - 12 comments
Labels: Docs, IO CSV, Needs Discussion

#21990 - API: add `inplace` kwarg to NDFrame.droplevel

Issue - State: open - Opened by vbarda about 7 years ago - 2 comments
Labels: Enhancement, Reshaping, Closing Candidate, inplace

#21969 - Pivot_table drop rows whose entries are all NaN

Issue - State: open - Opened by noob-saibot about 7 years ago - 4 comments
Labels: Bug, Missing-data, Reshaping

#21880 - Slowdown of str(record) of DataFrame.to_records() method

Issue - State: closed - Opened by gitrus about 7 years ago - 2 comments
Labels: Performance, Constructors

#21859 - DEPR: combine_first (replace with update(..., join='outer'); for both Series/DF)

Issue - State: open - Opened by h-vetinari about 7 years ago - 8 comments
Labels: Reshaping, Deprecate

#21825 - DOC: Series.mask() should point to Series.where() and vice versa

Issue - State: closed - Opened by teoguso about 7 years ago - 3 comments
Labels: Docs, good first issue

#21790 - API: inconsistencies between grouped and grouped[['col']] in groupby

Issue - State: closed - Opened by jorisvandenbossche about 7 years ago - 2 comments
Labels: Bug, Groupby, API - Consistency, Closing Candidate

#21725 - Support multiple characters for `comment` in read_csv

Issue - State: closed - Opened by orangeSi about 7 years ago - 6 comments
Labels: Enhancement, Duplicate Report, IO CSV

#21695 - pd.read_csv returns incorrect number of rows

Issue - State: closed - Opened by tastyminerals over 7 years ago - 2 comments

#21658 - BUG: .values for objects containing categoricals with box-able categories

Issue - State: closed - Opened by jorisvandenbossche over 7 years ago - 3 comments
Labels: good first issue, Needs Tests

#21597 - Support axis=None in all reductions

Issue - State: closed - Opened by TomAugspurger over 7 years ago - 17 comments
Labels: Enhancement, Reduction Operations

#21575 - TST: Change class-based auto-use setup to fixtures

Issue - State: closed - Opened by TomAugspurger over 7 years ago - 2 comments
Labels: Refactor, Testing

#21559 - merge_asof fails to coerce float types

Issue - State: open - Opened by crepererum over 7 years ago - 2 comments
Labels: Bug, Reshaping, Dtype Conversions

#21501 - Series dtype changes when a new row is added

Issue - State: closed - Opened by asdf8601 over 7 years ago - 7 comments
Labels: Bug, Missing-data, Dtype Conversions, setitem-with-expansion

#21412 - BUG: Categorical.__setitem__ allows for tuple assignment

Pull Request - State: closed - Opened by alysivji over 7 years ago - 3 comments
Labels: Enhancement, Categorical

#21374 - pd.eval() discards imaginary part in division "/"

Issue - State: closed - Opened by fillipe-gsm over 7 years ago - 7 comments
Labels: Bug, Complex, expressions

#21357 - ENH: adding .unique() to DF (or return_inverse for duplicated)

Issue - State: open - Opened by h-vetinari over 7 years ago - 12 comments
Labels: Enhancement

#21351 - Time Series Interpolation is wrong

Issue - State: closed - Opened by oricou over 7 years ago - 34 comments
Labels: Bug, Timeseries, Missing-data

#21340 - Groupby on a column with tuples creates a multiindex, yielding unexpected behaviour.

Issue - State: closed - Opened by masasin over 7 years ago - 7 comments
Labels: Bug, Groupby, MultiIndex, good first issue, Needs Tests, Nested Data

#21329 - ENH: allow lists/sets in fillna

Issue - State: open - Opened by h-vetinari over 7 years ago - 8 comments
Labels: Enhancement, Missing-data, Nested Data

#21305 - Direct delegation of Series methods to ExtensionArrays

Issue - State: closed - Opened by xhochy over 7 years ago - 5 comments
Labels: Enhancement, ExtensionArray, Closing Candidate

#21255 - DataFrame.unstack() drops columns if dataframe is empty

Issue - State: open - Opened by dwt over 7 years ago - 3 comments
Labels: Bug, Reshaping

#21219 - Barh does not have "secondary_y" functionality

Issue - State: closed - Opened by JoshuaC3 over 7 years ago - 1 comment
Labels: Enhancement, Visualization

#21150 - BUG: race condition in Index.is_unique

Issue - State: closed - Opened by adbull over 7 years ago - 11 comments
Labels: Bug, Multithreading, Closing Candidate

#21127 - DataFrameGroupBy.cumsum(axis=0) fails when grouped on axis=1

Issue - State: closed - Opened by kunalgosar over 7 years ago - 5 comments
Labels: Enhancement, Groupby, Error Reporting

#21092 - BUG: assert_index_equal does not raise error for check_categorical=False when comparing 2 CategoricalIndex objects

Pull Request - State: closed - Opened by alysivji over 7 years ago - 3 comments
Labels: Testing, Categorical

#20937 - BUG: Series(DTI/TDI) loses the frequency information from original DTI/TDI

Issue - State: open - Opened by jschendel over 7 years ago - 3 comments
Labels: Bug, Timeseries, Frequency, Needs Discussion, freq retention

#20899 - API: Add Dictionary-encoded Extension Type

Issue - State: closed - Opened by TomAugspurger over 7 years ago - 6 comments
Labels: Enhancement, ExtensionArray

#20896 - case sensitive merge

Issue - State: closed - Opened by shantanuo over 7 years ago - 12 comments

#20883 - Unexpected results when filtering with .isin (some fields contain python datastructures)

Issue - State: closed - Opened by atc0m over 7 years ago - 12 comments
Labels: good first issue, Needs Tests

#20849 - Memory leakage when concatting list of dataframes

Issue - State: open - Opened by ghost over 7 years ago - 3 comments
Labels: Performance, Reshaping

#20824 - DataFrame.groupby().sum() treating Nan as 0.0

Issue - State: closed - Opened by amanhanda over 7 years ago - 19 comments
Labels: Docs, Groupby, Reduction Operations, Closing Candidate

#20807 - A map method to work with many columns

Issue - State: closed - Opened by oricou over 7 years ago - 10 comments
Labels: Enhancement, Needs Discussion

#20803 - High Memory Usage when Concatenating Partially Indexed Series to Multiindexed Dataframe

Issue - State: closed - Opened by cyniphile over 7 years ago - 1 comment
Labels: Indexing, Performance, MultiIndex

#20752 - DOC clarify that pct_change() scale is actually 0-1, i.e. fractional_change()

Issue - State: closed - Opened by sunilshah over 7 years ago - 29 comments
Labels: Docs, good first issue

#20712 - Rolling sum (closed='left') with duplicate Timestamp indices.

Issue - State: closed - Opened by avivbd over 7 years ago - 10 comments
Labels: Bug, Window

#20693 - get_dummies(dummy_na=True) treats int like float when creating dummy names

Issue - State: closed - Opened by superxiao over 7 years ago - 8 comments
Labels: Bug, Missing-data, Dtype Conversions

#20660 - DataFrame.groupby.sum() is extremely slow when dtype is timedelta64[ns] compared to int64.

Issue - State: closed - Opened by wezzman over 7 years ago - 11 comments
Labels: good first issue, Benchmark

#20608 - read_json reads large integers as strings incorrectly if dtype not explicitly mentioned

Issue - State: closed - Opened by Udayraj123 over 7 years ago - 17 comments
Labels: Bug, IO JSON

#20601 - ERR: pivot_table when number of levels larger than int32 range

Issue - State: closed - Opened by mklwong over 7 years ago - 7 comments
Labels: Error Reporting, Numeric Operations, Algos, good first issue

#20536 - TST: Extract methods from TestXMySQL and TestXSQLite and remove

Issue - State: closed - Opened by TomAugspurger over 7 years ago - 6 comments
Labels: Refactor, Testing, IO SQL

#20525 - read_sql should convert Numeric to decimals

Issue - State: open - Opened by postelrich over 7 years ago - 9 comments
Labels: Enhancement, Dtype Conversions, IO SQL

#20521 - ENH adding metadata argument to DataFrame.to_parquet

Issue - State: open - Opened by JacekPliszka over 7 years ago - 14 comments
Labels: Enhancement, IO Parquet

#20498 - Force boolean column to category while reading a csv

Issue - State: closed - Opened by svgsponer over 7 years ago - 7 comments
Labels: IO Data, Regression, IO CSV, Categorical

#20492 - issue when shifting with Timedelta in a groupby

Issue - State: closed - Opened by randomgambit over 7 years ago - 15 comments
Labels: Docs, Groupby, Timedelta, good first issue

#20369 - merge_asof on multiple columns?

Issue - State: open - Opened by lorenzori over 7 years ago - 17 comments
Labels: Enhancement, Reshaping

#20281 - DOC: Remove Series.view(dtype=None) always trying float64

Issue - State: closed - Opened by jorisvandenbossche over 7 years ago - 7 comments
Labels: Docs

#20251 - DEPR: Series.view

Issue - State: closed - Opened by jreback over 7 years ago - 6 comments
Labels: Deprecate

#20110 - CLN: remove fastpath & verify_integrity from constructors

Issue - State: open - Opened by jreback over 7 years ago - 7 comments
Labels: Deprecate, Clean, Constructors

#20060 - ENH: Add Support for GroupBy Numeric Operations

Issue - State: closed - Opened by WillAyd over 7 years ago - 7 comments
Labels: Enhancement, Groupby, Numeric Operations

#19958 - Concat slow when frames indexed separately

Issue - State: closed - Opened by jeremywhelchel over 7 years ago - 11 comments
Labels: Performance, Reshaping

#19931 - Pandas complains about an already opened file, even when the file has been closed.

Issue - State: closed - Opened by spott over 7 years ago - 7 comments
Labels: IO HDF5, Needs Info