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Sum of TimedeltaIndex raises TypeError: len() of unsized object #25282

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H-SG opened this issue Feb 12, 2019 · 6 comments

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@H-SG
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commented Feb 12, 2019

Example code

import pandas as pd
import numpy as np

dti = pd.date_range('2018-01-01', periods=100, freq='T')
dtd = dti[1:] - dti[:-1]

print(np.sum(dtd))

Problem description

Summing a TimedeltaIndex when using pandas 0.24.0 or newer with any version of numpy, or pandas 0.23.4 with any version of numpy newer than 0.15.4 fails, np.sum(dtd) gives the following output:

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-1-d64fe48d0fec> in <module>
      6 
      7 print(np.mean(dtd)) # works
----> 8 print(np.sum(dtd)) # breaks

~/.local/lib/python3.6/site-packages/numpy/core/fromnumeric.py in sum(a, axis, dtype, out, keepdims, initial)
   2074 
   2075     return _wrapreduction(a, np.add, 'sum', axis, dtype, out, keepdims=keepdims,
-> 2076                           initial=initial)
   2077 
   2078 

~/.local/lib/python3.6/site-packages/numpy/core/fromnumeric.py in _wrapreduction(obj, ufunc, method, axis, dtype, out, **kwargs)
     84                 return reduction(axis=axis, out=out, **passkwargs)
     85 
---> 86     return ufunc.reduce(obj, axis, dtype, out, **passkwargs)
     87 
     88 

~/.local/lib/python3.6/site-packages/pandas/core/indexes/base.py in __array_wrap__(self, result, context)
    658         attrs = self._get_attributes_dict()
    659         attrs = self._maybe_update_attributes(attrs)
--> 660         return Index(result, **attrs)
    661 
    662     @cache_readonly

~/.local/lib/python3.6/site-packages/pandas/core/indexes/base.py in __new__(cls, data, dtype, copy, name, fastpath, tupleize_cols, **kwargs)
    301                   (dtype is not None and is_timedelta64_dtype(dtype))):
    302                 from pandas.core.indexes.timedeltas import TimedeltaIndex
--> 303                 result = TimedeltaIndex(data, copy=copy, name=name, **kwargs)
    304                 if dtype is not None and _o_dtype == dtype:
    305                     return Index(result.to_pytimedelta(), dtype=_o_dtype)

~/.local/lib/python3.6/site-packages/pandas/core/indexes/timedeltas.py in __new__(cls, data, unit, freq, start, end, periods, closed, dtype, copy, name, verify_integrity)
    250 
    251         # check that we are matching freqs
--> 252         if verify_integrity and len(data) > 0:
    253             if freq is not None and not freq_infer:
    254                 index = cls._simple_new(data, name=name)

TypeError: len() of unsized object

Other methods such as np.mean() and np.median() continue to function normally

Expected Output

5940000000000 nanoseconds

Output of pd.show_versions()

INSTALLED VERSIONS
------------------
commit: None
python: 3.6.7.final.0
python-bits: 64
OS: Linux
OS-release: 4.15.0-45-generic
machine: x86_64
processor: x86_64
byteorder: little
LC_ALL: None
LANG: en_US.UTF-8
LOCALE: en_US.UTF-8

pandas: 0.24.1
pytest: None
pip: 19.0.2
setuptools: 40.8.0
Cython: None
numpy: 1.16.1
scipy: 1.2.1
pyarrow: None
xarray: None
IPython: 7.2.0
sphinx: None
patsy: 0.5.1
dateutil: 2.8.0
pytz: 2018.9
blosc: None
bottleneck: None
tables: None
numexpr: None
feather: None
matplotlib: 3.0.2
openpyxl: None
xlrd: None
xlwt: None
xlsxwriter: None
lxml.etree: 4.3.1
bs4: 4.7.1
html5lib: 1.0.1
sqlalchemy: 1.2.17
pymysql: None
psycopg2: 2.7.7 (dt dec pq3 ext lo64)
jinja2: 2.10
s3fs: None
fastparquet: None
pandas_gbq: None
pandas_datareader: None
gcsfs: None
@WillAyd

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commented Feb 14, 2019

Can you post versions from both environments where you had the issue? Seems kind of strange that the version of numpy only matters for one of the two pandas versions you've tested

@WillAyd WillAyd added the Needs Info label Feb 14, 2019

@H-SG

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commented Feb 14, 2019

It's the same environment, I was updating my numpy and pandas libraries when I ran into the issue, all other packages remained the same. Playing around with installing specific versions of each led to the strange combination of working versions.

@jorisvandenbossche jorisvandenbossche added this to the 0.24.2 milestone Feb 14, 2019

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commented Feb 14, 2019

The above code indeed shows a regression in my 0.23.4 vs master environments. I have numpy 1.13 in both of them, so I don't think this is related to numpy.

It's the repr that fails, and it seems to be related to the fact that it now returns an "invalid" TimedeltaIndex, instead of a numpy.timedelta64 scalar:

In [8]: pd.__version__
Out[8]: '0.23.4'

In [9]: res = np.sum(dtd)

In [10]: type(res)
Out[10]: numpy.timedelta64

vs

In [15]: pd.__version__                                                                                                                                                         
Out[15]: '0.25.0.dev0+113.gb8306f19d.dirty'

In [16]: res = np.sum(dtd)                                                                                                                                                      

In [17]: type(res)                                                                                                                                                              
Out[17]: pandas.core.indexes.timedeltas.TimedeltaIndex

In [18]: res.values                                                                                                                                                             
Out[18]: array(5940000000000, dtype='timedelta64[ns]')

In [19]: res.values.ndim                                                                                                                                                        
Out[19]: 0
@jorisvandenbossche

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commented Feb 14, 2019

Might be related to the fact that the TimedeltaIndex/TimedeltaArray constructor no longer fails on scalars, but produces an invalid index/array:

In [12]: pd.__version__
Out[12]: '0.23.4'

In [13]: idx = pd.TimedeltaIndex(np.array(1, dtype='timedelta64[ns]'))
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-13-7b4cf68e5224> in <module>()
----> 1 idx = pd.TimedeltaIndex(np.array(1, dtype='timedelta64[ns]'))

~/miniconda3/lib/python3.5/site-packages/pandas/core/indexes/timedeltas.py in __new__(cls, data, unit, freq, start, end, periods, closed, dtype, copy, name, verify_integrity)
    250 
    251         # check that we are matching freqs
--> 252         if verify_integrity and len(data) > 0:
    253             if freq is not None and not freq_infer:
    254                 index = cls._simple_new(data, name=name)

TypeError: len() of unsized object

vs

In [29]: pd.__version__  
Out[29]: '0.25.0.dev0+113.gb8306f19d.dirty'

In [30]: idx = pd.TimedeltaIndex(np.array(1, dtype='timedelta64[ns]'))

In [31]: idx.array._data  
Out[31]: array(1, dtype='timedelta64[ns]')

cc @TomAugspurger @jbrockmendel seems EA refactor related

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commented Feb 15, 2019

@jorisvandenbossche I think you're right that the TimedeltaArray constructor is behaving oddly. Would __array_ufunc__ be the place to look to figure out why np.sum(tdi) behaves differently from np.sum(tdi._data)?

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commented Feb 15, 2019

Would __array_ufunc__ be the place to look to figure out why np.sum(tdi) behaves differently from np.sum(tdi._data)?

Long term, yes. But short term simply fixing the constructor should also fix the sum bug (due to the way how numpy deal with it), as you already did in the PR in the meantime.

meeseeksmachine pushed a commit to meeseeksmachine/pandas that referenced this issue Feb 20, 2019

jorisvandenbossche added a commit that referenced this issue Feb 20, 2019

thoo added a commit to thoo/pandas that referenced this issue Feb 20, 2019

Merge remote-tracking branch 'upstream/master' into Rt05
* upstream/master:
  API: more consistent error message for MultiIndex.from_arrays (pandas-dev#25189)
  fix typo of see also in DataFrame stat funcs (pandas-dev#25388)
  edited whatsnew typo (pandas-dev#25381)
  REGR: fix TimedeltaIndex sum and datetime subtraction with NaT (pandas-dev#25282, pandas-dev#25317) (pandas-dev#25329)
  ENH: indexing and __getitem__ of dataframe and series accept zerodim integer np.array as int (pandas-dev#24924)
  [CLN] Excel Module Cleanups (pandas-dev#25275)
  Interval dtype fix (pandas-dev#25338)
  BUG/ENH: Timestamp.strptime (pandas-dev#25124)
  14873: test for groupby.agg coercing booleans (pandas-dev#25327)
  [BUG] exception handling of MultiIndex.__contains__ too narrow (pandas-dev#25268)
  9236: test for the DataFrame.groupby with MultiIndex having pd.NaT (pandas-dev#25310)
  pandas-dev#23049: test for Fatal Stack Overflow stemming From Misuse of astype('category') (pandas-dev#25366)
  Remove spurious MultiIndex creation in `_set_axis_name` (pandas-dev#25371)
  DOC: modify typos in Contributing section (pandas-dev#25365)
  DOC/BLD: fix --no-api option (pandas-dev#25209)
  DOC: Correct doc mistake in combiner func (pandas-dev#25360)

the-nose-knows added a commit to the-nose-knows/pandas that referenced this issue Mar 9, 2019

upstream sync (#1)
* ERR/TST: Add pytest idiom to dtypes/test_cast.py (pandas-dev#24847)

* fix MacPython pandas-wheels failue (pandas-dev#24851)

* DEPS: Bump pyarrow min version to 0.9.0 (pandas-dev#24854)

Closes pandas-devgh-24767

* DOC: Document AttributeError for accessor (pandas-dev#24855)

Closes pandas-dev#20579

* Start whatsnew for 0.24.1 and 0.25.0 (pandas-dev#24848)

* DEPR/API: Non-ns precision in Index constructors (pandas-dev#24806)

* BUG: Format mismatch doesn't coerce to NaT (pandas-dev#24815)

* BUG: Properly parse unicode usecols names in CSV (pandas-dev#24856)

* CLN: fix typo in asv eval.Query suite (pandas-dev#24865)

* BUG: DataFrame respects dtype with masked recarray (pandas-dev#24874)

* REF/CLN: Move private method (pandas-dev#24875)

* BUG : ValueError in case on NaN value in groupby columns (pandas-dev#24850)

* BUG: fix floating precision formatting in presence of inf (pandas-dev#24863)

* DOC: Creating top-level user guide section, and moving pages inside (pandas-dev#24677)

* DOC: Creating top-level development section, and moving pages inside (pandas-dev#24691)

* DOC: Creating top-level getting started section, and moving pages inside (pandas-dev#24678)

* DOC: Implementing redirect system, and adding user_guide redirects (pandas-dev#24715)

* DOC: Implementing redirect system, and adding user_guide redirects

* Using relative urls for the redirect

* Validating that no file is overwritten by a redirect

* Adding redirects for getting started and development sections

* DOC: fixups (pandas-dev#24888)

* Fixed heading on whatnew
* Remove empty scalars.rst

* CLN: fix typo in ctors.SeriesDtypesConstructors setup (pandas-dev#24894)

* DOC: No clean in sphinx_build (pandas-dev#24902)

Closes pandas-dev#24727

* BUG (output formatting): use fixed with for truncation column instead of inferring from last column (pandas-dev#24905)

* DOC: also redirect old whatsnew url (pandas-dev#24906)

* Revert BUG-24212 fix usage of Index.take in pd.merge (pandas-dev#24904)

* Revert BUG-24212 fix usage of Index.take in pd.merge

xref pandas-dev#24733
xref pandas-dev#24897

* test 0.23.4 output

* added note about buggy test

* DOC: Add experimental note to DatetimeArray and TimedeltaArray (pandas-dev#24882)

* DOC: Add experimental note to DatetimeArray and TimedeltaArray

* Disable M8 in nanops (pandas-dev#24907)

* Disable M8 in nanops

Closes pandas-dev#24752

* CLN: fix typo in asv benchmark of non_unique_sorted, which was not sorted (pandas-dev#24917)

* API/VIS: remove misc plotting methods from plot accessor (revert pandas-dev#23811) (pandas-dev#24912)

* DOC: some 0.24.0 whatsnew clean-up (pandas-dev#24911)

* DOC: Final reorganization of documentation pages (pandas-dev#24890)

* DOC: Final reorganization of documentation pages

* Move ecosystem to top level

* DOC: Adding redirects to API moved pages (pandas-dev#24909)

* DOC: Adding redirects to API moved pages

* DOC: Making home page links more compact and clearer (pandas-dev#24928)

* DOC: 0.24 release date (pandas-dev#24930)

* DOC: Adding version to the whatsnew section in the home page (pandas-dev#24929)

* API: Remove IntervalArray from top-level (pandas-dev#24926)

* RLS: 0.24.0

* DEV: Start 0.25 cycle

* DOC: State that we support scalars in to_numeric (pandas-dev#24944)

We support it and test it already.

xref pandas-devgh-24910.

* DOC: Minor what's new fix (pandas-dev#24933)

* TST: GH#23922 Add missing match params to pytest.raises (pandas-dev#24937)

* Add tests for NaT when performing dt.to_period (pandas-dev#24921)

* DOC: switch headline whatsnew to 0.25 (pandas-dev#24941)

* BUG-24212 fix regression in pandas-dev#24897 (pandas-dev#24916)

* CLN: reduce overhead in setup for categoricals benchmarks in asv (pandas-dev#24913)

* Excel Reader Refactor - Base Class Introduction (pandas-dev#24829)

* TST/REF: Add pytest idiom to test_numeric.py (pandas-dev#24946)

* BLD: silence npy_no_deprecated warnings with numpy>=1.16.0 (pandas-dev#24864)

* CLN: Refactor cython to use memory views (pandas-dev#24932)

* DOC: Clean sort_values and sort_index docstrings (pandas-dev#24843)

* STY: use pytest.raises context syntax (indexing) (pandas-dev#24960)

* Fixed itertuples usage in to_dict (pandas-dev#24965)

* Fixed itertuples usage in to_dict

Closes pandas-dev#24940
Closes pandas-dev#24939

* STY: use pytest.raises context manager (resample) (pandas-dev#24977)

* DOC: Document breaking change to read_csv (pandas-dev#24989)

* DEPR: Fixed warning for implicit registration (pandas-dev#24964)

*  STY: use pytest.raises context manager (indexes/datetimes) (pandas-dev#24995)

* DOC: move whatsnew note of pandas-dev#24916 (pandas-dev#24999)

* BUG: Fix broken links (pandas-dev#25002)

The previous location of contributing.rst file was
/doc/source/contributing.rst but has been moved to
/doc/source/development/contributing.rst

* fix for BUG: grouping with tz-aware: Values falls after last bin (pandas-dev#24973)

* REGR: Preserve order by default in Index.difference (pandas-dev#24967)

Closes pandas-dev#24959

* CLN: do not use .repeat asv setting for storing benchmark data (pandas-dev#25015)

* CLN: isort asv_bench/benchmark/algorithms.py (pandas-dev#24958)

* fix+test to_timedelta('NaT', box=False) (pandas-dev#24961)

* PERF: significant speedup in sparse init and ops by using numpy in check_integrity (pandas-dev#24985)

* BUG: Fixed merging on tz-aware (pandas-dev#25033)

* Test nested PandasArray (pandas-dev#24993)

* DOC: fix error in documentation pandas-dev#24981 (pandas-dev#25038)

* BUG: support dtypes in column_dtypes for to_records() (pandas-dev#24895)

* Makes example from docstring work (pandas-dev#25035)

* CLN: typo fixups (pandas-dev#25028)

* BUG: to_datetime(strs, utc=True) used previous UTC offset (pandas-dev#25020)

* BUG: Better handle larger numbers in to_numeric (pandas-dev#24956)

* BUG: Better handle larger numbers in to_numeric

* Warn about lossiness when passing really large
numbers that exceed (u)int64 ranges.

* Coerce negative numbers to float when requested
instead of crashing and returning object.

* Consistently parse numbers as integers / floats,
even if we know that the resulting container has
to be float. This is to ensure consistent error
behavior when inputs numbers are too large.

Closes pandas-devgh-24910.

* MAINT: Address comments

* BUG: avoid usage in_qtconsole for recent IPython versions (pandas-dev#25039)

* Drop IPython<4.0 compat

* Revert "Drop IPython<4.0 compat"

This reverts commit 0cb0452.

* update
a
* whatsnew

* REGR: fix read_sql delegation for queries on MySQL/pymysql (pandas-dev#25024)

* DOC: Start 0.24.2.rst (pandas-dev#25026)

[ci skip]

* REGR: rename_axis with None should remove axis name (pandas-dev#25069)

* clarified the documentation for DF.drop_duplicates (pandas-dev#25056)

* Clarification in docstring of Series.value_counts (pandas-dev#25062)

* ENH: Support fold argument in Timestamp.replace (pandas-dev#25046)

* CLN: to_pickle internals (pandas-dev#25044)

* Implement+Test Tick.__rtruediv__ (pandas-dev#24832)

* API: change Index set ops sort=True -> sort=None (pandas-dev#25063)

* BUG: to_clipboard text truncated for Python 3 on Windows for UTF-16 text (pandas-dev#25040)

* PERF: use new to_records() argument in to_stata() (pandas-dev#25045)

* DOC: Cleanup 0.24.1 whatsnew (pandas-dev#25084)

* Fix quotes position in pandas.core, typos and misspelled parameters. (pandas-dev#25093)

* CLN: Remove sentinel_factory() in favor of object() (pandas-dev#25074)

* TST: remove DST transition scenarios from tc pandas-dev#24689 (pandas-dev#24736)

* BLD: remove spellcheck from Makefile (pandas-dev#25111)

* DOC: small clean-up of 0.24.1 whatsnew (pandas-dev#25096)

* DOC: small doc fix to Series.repeat (pandas-dev#25115)

* TST: tests for categorical apply (pandas-dev#25095)

* CLN: use dtype in constructor (pandas-dev#25098)

* DOC: frame.py doctest fixing (pandas-dev#25097)

* DOC: 0.24.1 release (pandas-dev#25125)

[ci skip]

* Revert set_index inspection/error handling for 0.24.1 (pandas-dev#25085)

* DOC: Minor what's new fix (pandas-dev#24933)

* Backport PR pandas-dev#24916: BUG-24212 fix regression in pandas-dev#24897 (pandas-dev#24951)

* Revert "Backport PR pandas-dev#24916: BUG-24212 fix regression in pandas-dev#24897 (pandas-dev#24951)"

This reverts commit 84056c5.

* DOC/CLN: Timezone section in timeseries.rst (pandas-dev#24825)

* DOC: Improve timezone documentation in timeseries.rst

* edit some of the examples

* Address review

* DOC: Fix validation type error RT04 (pandas-dev#25107) (pandas-dev#25129)

* Reading a HDF5 created in py2 (pandas-dev#25058)

* BUG: Fixing regression in DataFrame.all and DataFrame.any with bool_only=True (pandas-dev#25102)

* Removal of return variable names (pandas-dev#25123)

* DOC: Improve docstring of Series.mul (pandas-dev#25136)

* TST/REF: collect DataFrame reduction tests (pandas-dev#24914)

* Fix validation error type `SS05` and check in CI  (pandas-dev#25133)

* Fixed tuple to List Conversion in Dataframe class (pandas-dev#25089)

* STY: use pytest.raises context manager (indexes/multi) (pandas-dev#25175)

* DOC: Updates to Timestamp document (pandas-dev#25163)

* BLD: pin cython language level to '2' (pandas-dev#25145)

Not explicitly pinning the language level has been producing future
warnings from cython.  The next release of cython is going to change
the default level to '3str' under which the pandas cython extensions
do not compile.

The long term solution is to update the cython files to the next
language level, but this is a stop-gap to keep pandas building.

* CLN: Use ABCs in set_index (pandas-dev#25128)

* DOC: update docstring for series.nunique (pandas-dev#25116)

* DEPR: remove PanelGroupBy, disable DataFrame.to_panel (pandas-dev#25047)

* BUG: DataFrame.merge(suffixes=) does not respect None (pandas-dev#24819)

* fix MacPython pandas-wheels failure (pandas-dev#25186)

* modernize compat imports (pandas-dev#25192)

* TST: follow-up to Test nested pandas array pandas-dev#24993 (pandas-dev#25155)

* revert changes to tests in pandas-devgh-24993

* Test nested PandasArray

* isort test_numpy.py

* change NP_VERSION_INFO

* use LooseVersion

* add _np_version_under1p16

* remove blank line from merge master

* add doctstrings to fixtures

* DOC/CLN: Fix errors in Series docstrings (pandas-dev#24945)

* REF: Add more pytest idiom to test_holiday.py (pandas-dev#25204)

* DOC: Fix validation type error SA05 (pandas-dev#25208)

Create check for SA05 errors in CI

* BUG: Fix Series.is_unique with single occurrence of NaN (pandas-dev#25182)

* REF: Remove many Panel tests (pandas-dev#25191)

* DOC: Fixes to docstrings and add PR10 (space before colon) to validation (pandas-dev#25109)

* DOC: exclude autogenerated c/cpp/html files from 'trailing whitespace' checks (pandas-dev#24549)

* STY: use pytest.raises context manager (indexes/period) (pandas-dev#25199)

* fix ci failures (pandas-dev#25225)

* DEPR: remove tm.makePanel and all usages (pandas-dev#25231)

* DEPR: Remove Panel-specific parts of io.pytables (pandas-dev#25233)

* DEPR: Add Deprecated warning for timedelta with passed units M and Y  (pandas-dev#23264)

* BUG-25061 fix printing indices with NaNs (pandas-dev#25202)

* BUG: Fix regression in DataFrame.apply causing RecursionError (pandas-dev#25230)

* BUG: Fix regression in DataFrame.apply causing RecursionError

* Add feedback from PR

* Add feedback after further code review

* Add feedback after further code review 2

* BUG: Fix read_json orient='table' without index (pandas-dev#25170) (pandas-dev#25171)

* BLD: prevent asv from calling sys.stdin.close() by using different launch method (pandas-dev#25237)

* (Closes pandas-dev#25029) Removed extra bracket from cheatsheet code example. (pandas-dev#25032)

* CLN: For loops, boolean conditions, misc. (pandas-dev#25206)

* Refactor groupby group_add from tempita to fused types (pandas-dev#24954)

* CLN: Remove ipython 2.x compat (pandas-dev#25150)

* CLN: Remove ipython 2.x compat

* trivial change to trigger asv

* Update v0.25.0.rst

* revert whatsnew

* BUG: Duplicated returns boolean dataframe (pandas-dev#25234)

* REF/TST: resample/test_base.py (pandas-dev#25262)

* Revert "BLD: prevent asv from calling sys.stdin.close() by using different launch method (pandas-dev#25237)" (pandas-dev#25253)

This reverts commit f67b7fd.

* BUG: pandas Timestamp tz_localize and tz_convert do not preserve `freq` attribute (pandas-dev#25247)

* DEPR: remove assert_panel_equal (pandas-dev#25238)

* PR04 errors fix (pandas-dev#25157)

* Split Excel IO Into Sub-Directory (pandas-dev#25153)

* API: Ensure DatetimeTZDtype standardizes pytz timezones (pandas-dev#25254)

* API: Ensure DatetimeTZDtype standardizes pytz timezones

* Add whatsnew

* BUG: Fix exceptions when Series.interpolate's `order` parameter is missing or invalid (pandas-dev#25246)

* BUG: raise accurate exception from Series.interpolate (pandas-dev#24014)

* Actually validate `order` before use in spline

* Remove unnecessary check and dead code

* Clean up comparison/tests based on feedback

* Include invalid order value in exception

* Check for NaN order in spline validation

* Add whatsnew entry for bug fix

* CLN: Make unit tests assert one error at a time

* CLN: break test into distinct test case

* PEP8 fix in test module

* CLN: Test fixture for interpolate methods

* BUG: DataFrame.join on tz-aware DatetimeIndex (pandas-dev#25260)

* REF: use _constructor and ABCFoo to avoid runtime imports (pandas-dev#25272)

* Refactor groupby group_prod, group_var, group_mean, group_ohlc (pandas-dev#25249)

*  Fix typo in Cheat sheet with regex (pandas-dev#25215)

* Edit parameter type in pandas.core.frame.py DataFrame.count (pandas-dev#25198)

* TST/CLN: remove test_slice_ints_with_floats_raises (pandas-dev#25277)

* Removed Panel class from HDF ASVs (pandas-dev#25281)

* DOC: Fix minor typo in docstring (pandas-dev#25285)

* DOC/CLN: Fix errors in DataFrame docstrings (pandas-dev#24952)

* Skipped broken Py2 / Windows test (pandas-dev#25323)

* Rt05 documentation error fix issue 25108 (pandas-dev#25309)

* Fix typos in docs (pandas-dev#25305)

* Doc: corrects spelling in generic.py (pandas-dev#25333)

* BUG: groupby.transform retains timezone information (pandas-dev#25264)

* Fixes Formatting Exception (pandas-dev#25088)

* Bug: OverflowError in resample.agg with tz data (pandas-dev#25297)

* DOC/CLN: Fix various docstring errors (pandas-dev#25295)

* COMPAT: alias .to_numpy() for timestamp and timedelta scalars (pandas-dev#25142)

* ENH: Support times with timezones in at_time (pandas-dev#25280)

* BUG: Fix passing of numeric_only argument for categorical reduce (pandas-dev#25304)

* TST: use a fixed seed to have the same uniques across python versions (pandas-dev#25346)

TST: add pytest-mock to handle mocker fixture

* TST: xfail excel styler tests, xref GH25351 (pandas-dev#25352)

* TST: xfail excel styler tests, xref GH25351

* CI: cleanup .c files for cpplint>1.4

* DOC: Correct doc mistake in combiner func (pandas-dev#25360)

Closes pandas-devgh-25359.

* DOC/BLD: fix --no-api option (pandas-dev#25209)

* DOC: modify typos in Contributing section (pandas-dev#25365)

* Remove spurious MultiIndex creation in `_set_axis_name` (pandas-dev#25371)

* Resovles pandas-dev#25370
* Introduced by pandas-dev#22969

* pandas-dev#23049: test for Fatal Stack Overflow stemming From Misuse of astype('category') (pandas-dev#25366)

* 9236: test for the DataFrame.groupby with MultiIndex having pd.NaT (pandas-dev#25310)

* [BUG] exception handling of MultiIndex.__contains__ too narrow (pandas-dev#25268)

* 14873: test for groupby.agg coercing booleans (pandas-dev#25327)

* BUG/ENH: Timestamp.strptime (pandas-dev#25124)

* BUG: constructor Timestamp.strptime() does not support %z.

* Add doc string to NaT and Timestamp

* updated the error message

* Updated whatsnew entry.

* Interval dtype fix (pandas-dev#25338)

* [CLN] Excel Module Cleanups (pandas-dev#25275)

Closes pandas-devgh-25153

Authored-By: tdamsma <tdamsma@gmail.com>

* ENH: indexing and __getitem__ of dataframe and series accept zerodim integer np.array as int (pandas-dev#24924)

* REGR: fix TimedeltaIndex sum and datetime subtraction with NaT (pandas-dev#25282, pandas-dev#25317) (pandas-dev#25329)

* edited whatsnew typo (pandas-dev#25381)

* fix typo of see also in DataFrame stat funcs (pandas-dev#25388)

* API: more consistent error message for MultiIndex.from_arrays (pandas-dev#25189)

* CLN: (re-)enable infer_dtype to catch complex (pandas-dev#25382)

* DOC: Edited docstring of Interval (pandas-dev#25410)

The docstring contained a repeated segment, which I removed.

* Mark test_pct_max_many_rows as high memory (pandas-dev#25400)

Fixes issue pandas-dev#25384

* Correct a typo of version number for interpolate() (pandas-dev#25418)

* DEP: add pytest-mock to environment.yml (pandas-dev#25417)

* BUG: Fix type coercion in read_json orient='table' (pandas-dev#21345) (pandas-dev#25219)

* ERR: doc update for ParsingError (pandas-dev#25414)

Closes pandas-devgh-22881

* ENH: Add in sort keyword to DatetimeIndex.union (pandas-dev#25110)

* DOC: Rewriting of ParserError doc + minor spacing (pandas-dev#25421)

Follow-up to pandas-devgh-25414.

* API/ERR: allow iterators in df.set_index & improve errors (pandas-dev#24984)

* BUG: Indexing with UTC offset string no longer ignored (pandas-dev#25263)

* PERF/REF: improve performance of Series.searchsorted, PandasArray.searchsorted, collect functionality (pandas-dev#22034)

* TST: remove never-used singleton fixtures (pandas-dev#24885)

* BUG: fixed merging with empty frame containing an Int64 column (pandas-dev#25183) (pandas-dev#25289)

* DOC: fixed geo accessor example in extending.rst (pandas-dev#25420)

I realised "lon" and "lat" had just been switched with "longitude" and "latitude" in the following code block. So I used those names here as well.

* TST: numpy RuntimeWarning with Series.round() (pandas-dev#25432)

* CI: add __init__.py to isort skip list (pandas-dev#25455)

* DOC: CategoricalIndex doc string (pandas-dev#24852)

* DataFrame.drop Raises KeyError definition (pandas-dev#25474)

* BUG: Keep column level name in resample nunique (pandas-dev#25469)

Closes pandas-devgh-23222

xref pandas-devgh-23645

* ERR: Correct error message in to_datetime (pandas-dev#25467)

* ERR: Correct error message in to_datetime

Closes pandas-devgh-23830

xref pandas-devgh-23969

* Fix minor typo (pandas-dev#25458)

Signed-off-by: Philippe Ombredanne <pombredanne@nexb.com>

* CI: Set pytest minversion to 4.0.2 (pandas-dev#25402)

* CI: Set pytest minversion to 4.0.2

* STY: use pytest.raises context manager (indexes) (pandas-dev#25447)

* STY: use pytest.raises context manager (tests/test_*) (pandas-dev#25452)

* STY: use pytest.raises context manager (tests/test_*)

* fix ci failures

* skip py2 ci failure

* Fix minor error in dynamic load function (pandas-dev#25256)

* Cythonized GroupBy Quantile (pandas-dev#20405)

* BUG: Fix regression on DataFrame.replace for regex (pandas-dev#25266)

* BUG: Fix regression on DataFrame.replace for regex

The commit ensures that the replacement for regex is not confined to the 
beginning of the string but spans all the characters within. The 
behaviour is then consistent with versions prior to 0.24.0.

One test has been added to account for character replacement when the 
character is not at the beginning of the string.

* Correct contribution guide docbuild instruction (pandas-dev#25479)

* TST/REF: Add pytest idiom to test_frequencies.py (pandas-dev#25430)

* BUG: Fix index type casting in read_json with orient='table' and float index (pandas-dev#25433) (pandas-dev#25434)

* BUG: Groupby.agg with reduction function with tz aware data (pandas-dev#25308)

* BUG: Groupby.agg cannot reduce with tz aware data

* Handle output always as UTC

* Add whatsnew

* isort and add another fixed groupby.first/last issue

* bring condition at a higher level

* Add try for _try_cast

* Add comments

* Don't pass the utc_dtype explicitly

* Remove unused import

* Use string dtype instead

* DOC: Fix docstring for read_sql_table (pandas-dev#25465)

* ENH: Add Series.str.casefold (pandas-dev#25419)

* Fix PR10 error and Clean up docstrings from functions related to RT05 errors (pandas-dev#25132)

* Fix unreliable test (pandas-dev#25496)

* DOC: Clarifying doc/make.py --single parameter (pandas-dev#25482)

* fix MacPython / pandas-wheels ci failures (pandas-dev#25505)

* DOC: Reword Series.interpolate docstring for clarity (pandas-dev#25491)

* Changed insertion order to sys.path (pandas-dev#25486)

* TST: xfail non-writeable pytables tests with numpy 1.16x (pandas-dev#25517)

* STY: use pytest.raises context manager (arithmetic, arrays, computati… (pandas-dev#25504)

* BUG: Fix RecursionError during IntervalTree construction (pandas-dev#25498)

* STY: use pytest.raises context manager (plotting, reductions, scalar...) (pandas-dev#25483)

* STY: use pytest.raises context manager (plotting, reductions, scalar...)

* revert removed testing in test_timedelta.py

* remove TODO from test_frame.py

* skip py2 ci failure

* BUG: Fix potential segfault after pd.Categorical(pd.Series(...), categories=...) (pandas-dev#25368)

* Make DataFrame.to_html output full content (pandas-dev#24841)

* BUG-16807-1 SparseFrame fills with default_fill_value if data is None (pandas-dev#24842)

Closes pandas-devgh-16807.

* DOC: Add conda uninstall pandas to contributing guide (pandas-dev#25490)

* fix pandas-dev#25487 add modify documentation

* fix segfault when running with cython coverage enabled, xref cython#2879 (pandas-dev#25529)

* TST: inline empty_frame = DataFrame({}) fixture (pandas-dev#24886)

* DOC: Polishing typos out of doc/source/user_guide/indexing.rst (pandas-dev#25528)

* STY: use pytest.raises context manager (frame) (pandas-dev#25516)

* DOC: Fix pandas-dev#24268 by updating description for keep in Series.nlargest (pandas-dev#25358)

* DOC: Fix pandas-dev#24268 by updating description for keep

* fix MacPython / pandas-wheels ci failures (pandas-dev#25537)

*  TST/CLN: Remove more Panel tests (pandas-dev#25550)

* BUG: caught typeError in series.at (pandas-dev#25506) (pandas-dev#25533)

* ENH: Add errors parameter to DataFrame.rename (pandas-dev#25535)

* ENH: GH13473 Add errors parameter to DataFrame.rename

* TST: Skip IntervalTree construction overflow test on 32bit (pandas-dev#25558)

* DOC: Small fixes to 0.24.2 whatsnew (pandas-dev#25559)

* minor typo error (pandas-dev#25574)

* BUG: in error message raised when invalid axis parameter (pandas-dev#25553)

* BLD: Fixed pip install with no numpy (pandas-dev#25568)

* Document the behavior of `axis=None` with `style.background_gradient` (pandas-dev#25551)

* fix minor typos in dsintro.rst (pandas-dev#25579)

* BUG: Handle readonly arrays in period_array (pandas-dev#25556)

* BUG: Handle readonly arrays in period_array

Closes pandas-dev#25403

* DOC: Fix typo in tz_localize (pandas-dev#25598)

* BUG: secondary y axis could not be set to log scale (pandas-dev#25545) (pandas-dev#25586)

* TST: add test for groupby on list of empty list (pandas-dev#25589)

* TYPING: Small fixes to make stubgen happy (pandas-dev#25576)

* CLN: Parmeterize test cases (pandas-dev#25355)
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