API: add infer_objects for soft conversions #16915

chris-b1 · 2017-07-13T23:39:13Z

closes API: .convert_objects is deprecated, do we want a .convert to replace? #11221 (more or less)
tests added / passed
passes git diff upstream/master --name-only -- '*.py' | flake8 --diff (On Windows, git diff upstream/master -u -- "*.py" | flake8 --diff might work as an alternative.)
whatsnew entry

Need to add more tests cases still

gfyoung · 2017-07-13T23:40:36Z

doc/source/whatsnew/v0.21.0.txt

+function (:issue:`11221`)
+
+This function only performs soft conversions on object columns, converting python scalars
+to native types, but not any coercive conversions.  For example


python --> Python
for example --> For example:

python scalars -> python objects

use colon after For example

gfyoung · 2017-07-13T23:41:50Z

pandas/core/generic.py

+        """
+        Attempt to infer better dtypes for only object columns
+        Only attempts soft conversions
+


The beginning of the docstring should be a single line.

gfyoung · 2017-07-13T23:42:06Z

pandas/core/generic.py

+
+        Returns
+        -------
+        converted : same as input object


Not quite though, as the dtypes could have been changed, right?

gfyoung · 2017-07-13T23:43:27Z

pandas/tests/frame/test_block_internals.py

+                                    datetime(2016, 1, 2),
+                                    datetime(2016, 1, 3)]},
+                             columns=['a', 'b', 'c'])
+        tm.assert_frame_equal(df.reset_index(drop=True), expected)


What is the purpose of this part of the test?

This enforces that the inference rules I'm checking against are the same as DataFrame constructor

Ah, I see. Perhaps a comment above expected might be useful, since it wasn't immediately clear (at least to me) why this was done.

gfyoung · 2017-07-13T23:44:27Z

pandas/tests/series/test_dtypes.py

+        actual = (Series(np.array([1, 2, 3, None, 'a'], dtype='O'))
+                  .infer_objects())
+        expected = Series([1, 2, 3, None, 'a'])
+        assert actual.dtype == 'object'


Perhaps a comment above that block of code explaining why this is the case would be useful.

Also, why isn't there a similar test for DataFrame (i.e. one where we actually get object) ?

codecov · 2017-07-14T00:07:30Z

Codecov Report

Merging #16915 into master will decrease coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master   #16915      +/-   ##
==========================================
- Coverage   90.99%   90.97%   -0.02%     
==========================================
  Files         161      161              
  Lines       49303    49294       -9     
==========================================
- Hits        44863    44846      -17     
- Misses       4440     4448       +8

Flag	Coverage Δ
#multiple	`88.74% <100%> (-0.01%)`	⬇️
#single	`40.18% <33.33%> (-0.07%)`	⬇️

Impacted Files	Coverage Δ
pandas/core/generic.py	`92.31% <100%> (+0.01%)`	⬆️
pandas/io/gbq.py	`25% <0%> (-58.34%)`	⬇️
pandas/plotting/_converter.py	`63.23% <0%> (-1.82%)`	⬇️
pandas/compat/__init__.py	`60.67% <0%> (-1.55%)`	⬇️
pandas/core/config_init.py	`95.86% <0%> (-0.1%)`	⬇️
pandas/core/frame.py	`97.76% <0%> (-0.05%)`	⬇️
pandas/core/sparse/frame.py	`94.24% <0%> (-0.02%)`	⬇️
pandas/core/dtypes/cast.py	`86.89% <0%> (ø)`	⬆️
pandas/core/panel.py	`96.94% <0%> (ø)`	⬆️
... and 6 more

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bashtage · 2017-07-14T10:14:16Z

pandas/core/generic.py

+        Attempt to infer better dtypes for only object columns
+        Only attempts soft conversions
+
+        See Also


Maybe a note that this is the same as the inference used when a DataFrame is constructed?

jreback · 2017-07-14T14:14:48Z

doc/source/whatsnew/v0.21.0.txt

@@ -25,6 +25,35 @@ New features
 - Added ``__fspath__`` method to :class:`~pandas.HDFStore`, :class:`~pandas.ExcelFile`,
  and :class:`~pandas.ExcelWriter` to work properly with the file system path protocol (:issue:`13823`)

+


add a sub-section reference

jreback · 2017-07-14T14:15:28Z

doc/source/whatsnew/v0.21.0.txt

+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+``DataFrame`` and ``Series`` have gained an ``infer_objects`` method to perform dtype inference
+on object columns, replacing some of the functionality of the deprecated ``convert_objects``


maybe want to make these :func:`Series.infer_objects` (and the like), but needs rewording to do that

jreback · 2017-07-14T14:16:02Z

doc/source/whatsnew/v0.21.0.txt

+function (:issue:`11221`)
+
+This function only performs soft conversions on object columns, converting python scalars
+to native types, but not any coercive conversions.  For example


python scalars -> python objects

jreback · 2017-07-14T14:16:16Z

doc/source/whatsnew/v0.21.0.txt

+function (:issue:`11221`)
+
+This function only performs soft conversions on object columns, converting python scalars
+to native types, but not any coercive conversions.  For example


use colon after For example

jreback · 2017-07-14T14:16:53Z

doc/source/whatsnew/v0.21.0.txt

+   df = pd.DataFrame({'A': [1, 2, 3],
+                      'B': np.array([1, 2, 3], dtype='object'),
+                      'C': ['1', '2', '3']})
+   df.dtypes


sould have this same example in the docs (in basics.rst) and a ref to that.

jreback · 2017-07-14T14:18:44Z

pandas/core/generic.py

+    def infer_objects(self):
+        """
+        Attempt to infer better dtypes for only object columns
+        Only attempts soft conversions


add a version added tag

gfyoung · 2017-07-17T23:11:06Z

pandas/core/generic.py


        return self._constructor(
            self._data.convert(convert_dates=convert_dates,
                               convert_numeric=convert_numeric,
                               convert_timedeltas=convert_timedeltas,
                               copy=copy)).__finalize__(self)

+    def infer_objects(self):
+        """
+        Attempt to infer better dtypes for object columns


Nit: add a period at the end.

gfyoung · 2017-07-17T23:11:23Z

pandas/core/generic.py

+        """
+        Attempt to infer better dtypes for object columns
+
+        Attempts soft conversion of object dtyped


Nit: "object dtyped" --> "object-dtyped"

gfyoung · 2017-07-17T23:12:01Z

pandas/tests/series/test_dtypes.py

+        actual = (Series(np.array([1, 2, 3, None, 'a'], dtype='O'))
+                  .infer_objects())
+        expected = Series([1, 2, 3, None, 'a'])
+        assert actual.dtype == 'object'


Nit: add newline between "expected =" and "assert " (for readability)

jreback

lgtm. minor doc comments. merge on green (after fix)

jreback · 2017-07-18T01:18:33Z

doc/source/basics.rst

+     df = df.T
+     df
+     df.dtypes
+     df.infer_objects().dtypes


make this a separate ipython block (to break up the code)

jreback · 2017-07-18T01:19:06Z

doc/source/whatsnew/v0.21.0.txt

+``infer_objects`` type conversion
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+The `:meth:`~DataFrame.infer_objects` and :meth:`~Series.infer_objects`


add a ref to the basics section above.

jreback · 2017-07-18T01:19:32Z

pandas/core/generic.py

+        >>> df.dtypes
+        A    object
+        dtype: object
+        >>> df.infer_objects().dtypes


I like blank lines between these sections of code

chris-b1 · 2017-07-18T11:26:49Z

thanks @gfyoung @jreback @bashtage

jreback · 2017-07-19T01:17:14Z

@chris-b1 when you have a chance: http://pandas-docs.github.io/pandas-docs-travis/whatsnew.html#infer-objects-type-conversion

.dtype -> .dtypes

I don't know why :meth: doesn't work, I use :func: which seems to....

@TomAugspurger

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Closes pandas-devgh-12565 * DOC: more whatsnew fixes * DOC: Reset index examples closes pandas-dev#16416 Author: aernlund <awe220@nyumc.org> Closes pandas-dev#16967 from aernlund/reset_index_docs and squashes the following commits: 3c6a4b6 [aernlund] DOC: added examples to reset_index 4838155 [aernlund] DOC: added examples to reset_index 2a51e2b [aernlund] DOC: added examples to reset_index * channel from pandas to conda-forge (pandas-dev#16966) * BUG: coercing of bools in groupby transform (pandas-dev#16895) * DOC: misspelling in DatetimeIndex.indexer_between_time [CI skip] (pandas-dev#16963) * CLN: some residual code removed, xref to pandas-dev#16761 (pandas-dev#16974) * ENH: Create a 'Y' alias for date_range yearly frequency Closes pandas-devgh-9313 * Revert "ENH: Create a 'Y' alias for date_range yearly frequency" (pandas-dev#16976) This reverts commit 9c096d2, as it was prematurely made. * DOC: behavior when slicing with missing bounds (pandas-dev#16932) closes pandas-dev#16917 * TST: Add test for sub-char in read_csv (pandas-dev#16977) Closes pandas-devgh-16893. * DEPR: deprecate html.border option (pandas-dev#16970) * DOC: document convention argument for resample() (pandas-dev#16965) * DOC: document convention argument for resample() * DOC: Clarify 'it' in aggregate doc (pandas-dev#16989) Closes pandas-devgh-16988. * CLN/COMPAT: for various py2/py3 in doc/bench scripts (pandas-dev#16984) * PERF: SparseDataFrame._init_dict uses intermediary dict, not DataFrame (pandas-dev#16883) Closes pandas-devgh-16773. * MAINT: Drop line_width and height from options (pandas-dev#16993) Deprecated since 0.11 and 0.12 respectively. * COMPAT: Add back remove_na for seaborn (pandas-dev#16992) Closes pandas-devgh-16971. * COMPAT: np.full not available in all versions, xref pandas-dev#16773 (pandas-dev#17000) * DOC, TST: Clarify whitespace behavior in read_fwf documentation (pandas-dev#16950) Closes pandas-devgh-16772 * API: add infer_objects for soft conversions (pandas-dev#16915) * API: add infer_objects for soft conversions * doc fixups * fixups * doc * BUG: np.inf now causes Index to upcast from int to float (pandas-dev#16996) Closes pandas-devgh-16957. * DOC: Make highlight functions match documentation (pandas-dev#16999) Closes pandas-devgh-16998. * BUG: Large object array isin closes pandas-dev#16012 Author: Morgan Stuart <morgansstuart243@gmail.com> Closes pandas-dev#16969 from Morgan243/large_array_isin and squashes the following commits: 31cb4b3 [Morgan Stuart] Removed unneeded details from whatsnew description 4b59745 [Morgan Stuart] Linting errors; additional test clarification 186607b [Morgan Stuart] BUG pandas-dev#16012 - fix isin for large object arrays * BUG: reindex would throw when a categorical index was empty pandas-dev#16770 closes pandas-dev#16770 Author: ri938 <r_irv938@hotmail.com> Author: Jeff Reback <jeff@reback.net> Author: Tuan <tuan.d.tran@hotmail.com> Author: Forbidden Donut <forbdonut@gmail.com> This patch had conflicts when merged, resolved by Committer: Jeff Reback <jeff@reback.net> Closes pandas-dev#16820 from ri938/bug_issue16770 and squashes the following commits: 0e2d315 [ri938] Merge branch 'master' into bug_issue16770 9802288 [ri938] Update v0.20.3.txt 1f2865e [ri938] Update v0.20.3.txt 83fd749 [ri938] Update v0.20.3.txt eab3192 [ri938] Merge branch 'master' into bug_issue16770 7acc09f [ri938] Minor correction to previous submit 6e8f1b3 [ri938] Minor corrections to previous submit (pandas-dev#16820) 9ed80f0 [ri938] Bring documentation into line with master branch. 26e1a60 [ri938] Move documentation of change to the next major release 0.21.0 59b17cd [Jeff Reback] BUG: rolling.cov with multi-index columns should presever the MI (pandas-dev#16825) 5362447 [Tuan] fix BUG: ValueError when performing rolling covariance on multi indexed DataFrame (pandas-dev#16814) 800b40d [ri938] BUG: render dataframe as html do not produce duplicate element id's (pandas-dev#16780) (pandas-dev#16801) a725fbf [Forbidden Donut] BUG: Fix read of py3 PeriodIndex DataFrame HDF made in py2 (pandas-dev#16781) (pandas-dev#16790) 8f8e3d6 [ri938] TST: register slow marker (pandas-dev#16797) 0645868 [ri938] Add backticks in documentation 0a20024 [ri938] Minor correction to previous submit 69454ec [ri938] Minor corrections to previous submit (pandas-dev#16820) 3092bbc [ri938] BUG: reindex would throw when a categorical index was empty pandas-dev#16770 * BUG: Don't with empty Series for .isin (pandas-dev#17006) Empty Series initializes to float64, even when the data type is object for .isin, leading to an error with membership. Closes pandas-devgh-16991. * ENH: Use 'Y' as an alias for end of year (pandas-dev#16978) Closes pandas-devgh-9313 Redo of pandas-devgh-16958 * DOC: infer_objects doc fixup (pandas-dev#17018) * Fixes SparseSeries initiated with dictionary raising AttributeError (pandas-dev#16960) * DOC: Improving docstring of reset_index method (pandas-dev#16416) (pandas-dev#16975) * DOC: add warning to append about inefficiency (pandas-dev#17017) * DOC : Remove redundant backtick (pandas-dev#17025) * DOC: Document business frequency aliases (pandas-dev#17028) Follow-up to pandas-devgh-16978. * DOC: Fix double back-tick in 'Reshaping by Melt' section (pandas-dev#17030) See current stable docs for the issue: https://pandas.pydata.org/pandas-docs/stable/reshaping.html#reshaping-by-melt The double ` is causing the entire paragraph to be fixed width until the next double `. This commit removes the extra "`" * Define DataFrame plot methods in DataFrame (pandas-dev#17020) * CLN: move safe_sort from core.algorithms to core.sorting (pandas-dev#17034) COMPAT: safe_sort will only coerce list-likes to object, not a numpy string type xref: pandas-dev#17003 (comment) * DOC: Fixed Minor Typo (pandas-dev#17043) Cocumentation to Documentation * BUG: do not cast ints to floats if inputs o crosstab are not aligned (pandas-dev#17011) closes pandas-dev#17005 * BUG in merging categorical dates closes pandas-dev#16900 Author: Dave Willmer <dave.willmer@gmail.com> This patch had conflicts when merged, resolved by Committer: Jeff Reback <jeff@reback.net> Closes pandas-dev#16986 from dwillmer/cat_fix and squashes the following commits: 1ea1977 [Dave Willmer] Minor tweaks + comment 21a35a0 [Dave Willmer] Merge branch 'cat_fix' of https://github.com/dwillmer/pandas into cat_fix 04d5404 [Dave Willmer] Update tests 3cc5c24 [Dave Willmer] Merge branch 'master' into cat_fix 5e8e23b [Dave Willmer] Add whatsnew item b82d117 [Dave Willmer] Lint fixes a81933d [Dave Willmer] Remove unused import 218da66 [Dave Willmer] Generic solution to categorical problem 48e7163 [Dave Willmer] Test inner join 8843c10 [Dave Willmer] Fix TypeError when merging categorical dates * BUG: __setitem__ with a tuple induces NaN with a tz-aware DatetimeIndex (pandas-dev#16889) (pandas-dev#16897) * Added test for _get_dtype_type. (pandas-dev#16899) * BUG/API: dtype inconsistencies in .where / .setitem / .putmask / .fillna (pandas-dev#16821) * CLN/BUG: fix ndarray assignment may cause unexpected cast supersedes pandas-dev#14145 closes pandas-dev#14001 * API: This fixes a number of inconsistencies and API issues w.r.t. dtype conversions. This is a reprise of pandas-dev#14145 & pandas-dev#16408. This removes some code from the core structures & pushes it to internals, where the primitives are made more consistent. This should all us to be a bit more consistent for pandas2 type things. closes pandas-dev#16402 supersedes pandas-dev#14145 closes pandas-dev#14001 CLN: remove uneeded code in internals; use split_and_operate when possible * BUG: Improved thread safety for read_html() GH16928 (pandas-dev#16930) * Fixed 'add_methods' when the 'select' argument is specified. (pandas-dev#17045) * TST: Fix error message check in np.argsort comparision (pandas-dev#17051) Closes pandas-devgh-17046. * TST: Move some Series ctor tests to SharedWithSparse (pandas-dev#17050) * BUG: Made SparseDataFrame.fillna() fill all NaNs A continuation of pandas-dev#16178 closes pandas-dev#16112 closes pandas-dev#16178 Author: Kernc <kerncece@gmail.com> Author: keitakurita <kris337jbn@yahoo.co.jp> This patch had conflicts when merged, resolved by Committer: Jeff Reback <jeff@reback.net> Closes pandas-dev#16892 from kernc/sparse-fillna and squashes the following commits: c1cd33e [Kernc] fixup! BUG: Made SparseDataFrame.fillna() fill all NaNs 2974232 [Kernc] fixup! BUG: Made SparseDataFrame.fillna() fill all NaNs 4bc01a1 [keitakurita] BUG: Made SparseDataFrame.fillna() fill all NaNs * BUG: Use size_t to avoid array index overflow; add missing malloc of error_msg Fix a few locations where a parser's `error_msg` buffer is written to without having been previously allocated. This manifested as a double free during exception handling code making use of the `error_msg`. Additionally, use `size_t/ssize_t` where array indices or lengths will be stored. Previously, int32_t was used and would overflow on columns with very large amounts of data (i.e. greater than INTMAX bytes). xref pandas-dev#14696 closes pandas-dev#16798 Author: Jeff Knupp <jeff.knupp@enigma.com> Author: Jeff Knupp <jeff@jeffknupp.com> Closes pandas-dev#17040 from jeffknupp/16790-core-on-large-csv and squashes the following commits: 6a1ba23 [Jeff Knupp] Clear up prose a5d5677 [Jeff Knupp] Fix linting issues 4380c53 [Jeff Knupp] Fix linting issues 7b1cd8d [Jeff Knupp] Fix linting issues e3cb9c1 [Jeff Knupp] Add unit test plus '--high-memory' option, *off by default*. 2ab4971 [Jeff Knupp] Remove debugging code 2930eaa [Jeff Knupp] Fix line length to conform to linter rules e4dfd19 [Jeff Knupp] Revert printf format strings; fix more comment alignment 3171674 [Jeff Knupp] Fix some leftover size_t references 0985cf3 [Jeff Knupp] Remove debugging code; fix type cast 669d99b [Jeff Knupp] Fix linting errors re: line length 1f24847 [Jeff Knupp] Fix comment alignment; add whatsnew entry e04d12a [Jeff Knupp] Switch to use int64_t rather than size_t due to portability concerns. d5c75e8 [Jeff Knupp] BUG: Use size_t to avoid array index overflow; add missing malloc of error_msg * TST: remove some test warnings in parser tests (pandas-dev#17057) TST: move highmemory test to proper location in c_parser_only xref pandas-dev#16798 * DOC: Add more examples for reset_index (pandas-dev#17055) * MAINT: Add dash in high memory message Follow-up to pandas-devgh-17057. * MAINT: kwards --> kwargs in parsers.pyx * CLN: Cleanup comments in before_install_travis.sh envars.sh doesn't exist anymore. In fact, it's been gone for awhile. * MAINT: Remove duplicate Series sort_index check Duplicate boolean validation check for sort_index in series/test_validate.py * BLD: Pin pyarrow=0.4.1 (pandas-dev#17065) Addresses pandas-devgh-17064. Also add some additional build information when calling `pd.show_versions` * ENH: provide "inplace" argument to set_axis() closes pandas-dev#14636 Author: Pietro Battiston <me@pietrobattiston.it> Closes pandas-dev#16994 from toobaz/set_axis_inplace and squashes the following commits: 8fb9d0f [Pietro Battiston] REF: adapt NDFrame.set_axis() calls to new signature 409f502 [Pietro Battiston] ENH: provide "inplace" argument to set_axis(), change signature * BUG: Fix parser field type compatability on 32-bit systems. (pandas-dev#17071) Closes pandas-devgh-17063 * COMPAT: rename isnull -> isna, notnull -> notna (pandas-dev#16972) closes pandas-dev#15001 * BUG: Thoroughly dedup columns in read_csv (pandas-dev#17060) * ENH: Add skipna parameter to infer_dtype (pandas-dev#17066) Currently defaults to False for backwards compatibility. Will default to True in the future. Closes pandas-devgh-17059. * MAINT: Remove unused variable in test_scalar.py The "expected" variable is unused at the end of a test in indexing/test_scalar.py * TST: Add tests/indexing/ and reshape/ to setup.py (pandas-dev#17076) Looks like we just forgot about them. Oops. * CI: partially revert pandas-dev#17065, un-pin pyarrow on some builds * DOC: whatsnew typos * TST: Check more error messages in tests (pandas-dev#17075) * BUG: Respect dtype when calling pivot_table with margins=True closes pandas-dev#17013 This fix actually exposed an occurrence of pandas-dev#17035 in an existing test (as well as in one I added). Author: Pietro Battiston <me@pietrobattiston.it> Closes pandas-dev#17062 from toobaz/pivot_margin_int and squashes the following commits: 2737600 [Pietro Battiston] Removed now obsolete workaround 956c4f9 [Pietro Battiston] BUG: respect dtype when calling pivot_table with margins=True * MAINT: Add missing space in parsers.pyx "2< heuristic" --> "2 < heuristic" * MAINT: Add missing paren around print statement Stray verbose print statement in parsers.pyx was bare without any parentheses. * DOC: fix typos in missing.rst xref pandas-dev#16972 * DOC: further clean-up null/na changes (pandas-dev#17113) * BUG: Allow pd.unique to accept tuple of strings (pandas-dev#17108) * BUG: Allow Series with same name with crosstab (pandas-dev#16028) Closes pandas-devgh-13279 * COMPAT: make sure use_inf_as_null is deprecated (pandas-dev#17126) closes pandas-dev#17115 * CI: bump version of xlsxwriter to 0.5.2 (pandas-dev#17142) * DOC: Clean up instructions in ISSUE_TEMPLATE (pandas-dev#17146) * Add missing space to the NotImplementedError's message for compound dtypes (pandas-dev#17140) * DOC: (de)type the return value of concat (pandas-dev#17079) (pandas-dev#17119) * BUG: Thoroughly dedup column names in read_csv (pandas-dev#17095) * DOC: Additions/updates to documentation (pandas-dev#17150) * ENH: add to/from_parquet with pyarrow & fastparquet (pandas-dev#15838) * DOC: doc typos, xref pandas-dev#15838 * TST: test for categorical index monotonicity (pandas-dev#17152) * correctly determine bottleneck version * tests for categorical index monotonicity * fix Index.is_monotonic to point to Index.is_monotonic_increasing directly * MAINT: Remove non-standard and inconsistently-used imports (pandas-dev#17085) * DOC: typos in whatsnew * DOC: whatsnew 0.21.0 fixes * BUG: Fix CSV parsing of singleton list header (pandas-dev#17090) Closes pandas-devgh-7757. * ENH: Support strings containing '%' in add_prefix/add_suffix (pandas-dev#17151) (pandas-dev#17162) * REF: repr - allow block to override values that get formatted (pandas-dev#17143) * MAINT: Drop unnecessary newlines in issue template * remove direct import of nan Author: Brock Mendel <jbrockmendel@gmail.com> Closes pandas-dev#17185 from jbrockmendel/dont_import_nan and squashes the following commits: ee260b8 [Brock Mendel] remove direct import of nan * use == to test String equality (pandas-dev#17171) * ENH: Add warning when setting into nonexistent attribute (pandas-dev#16951) closes pandas-dev#7175 closes pandas-dev#5904 * DOC: added string processing comparison with SAS (pandas-dev#16497) * CLN: remove unused get methods in internals (pandas-dev#17169) * Remove unused get methods that would raise AttributeError if called * Remove unnecessary import * TST: Partial Boolean DataFrame Indexing (pandas-dev#17186) Closes pandas-devgh-17170 * CLN: Reformat docstring for IPython fixture * Define Series.plot and Series.hist in class definition (pandas-dev#17199) * BUG: support pandas objects in iloc with old numpy versions (pandas-dev#17194) closes pandas-dev#17193 * Implement _make_accessor classmethod for PandasDelegate (pandas-dev#17166) * Create ABCDateOffset (pandas-dev#17165) * BUG: resample and apply modify the index type for empty Series (pandas-dev#17149) * DOC: Updated NDFrame.astype docs (pandas-dev#17203) * MAINT: Minor touch-ups to GitHub PULL_REQUEST_TEMPLATE (pandas-dev#17207) Remove leading space from task-list so that tasks aren't nested. * CLN: replace %s syntax with .format in core.computation (pandas-dev#17209) * Bugfix for multilevel columns with empty strings in Python 2 (pandas-dev#17099) * CLN/ASV clean-up frame stat ops benchmarks (pandas-dev#17205) * BUG: Rolling apply on DataFrame with Datetime index returns NaN (pandas-dev#17156) * CLN: Remove import exception handling (pandas-dev#17218) Imports should succeed on all versions of Python that pandas supports. * MAINT: Remove extra the's in deprecation messages (pandas-dev#17222) * DOC: Patch docs in _decorators.py * CLN: replace %s syntax with .format in pandas.util (pandas-dev#17224) * Add 'See also' sections (pandas-dev#17223) * move pivot_table doc-string to DataFrame (pandas-dev#17174) * Remove import of pandas as pd in core.window (pandas-dev#17233) * TST: Move more frame tests to SharedWithSparse (pandas-dev#17227) * REF: _get_objs_combined_axis (pandas-dev#17217) * ENH/PERF: Remove frequency inference from .dt accessor (pandas-dev#17210) * ENH/PERF: Remove frequency inference from .dt accessor * BENCH: Add DatetimeAccessor benchmark * DOC: Whatsnew * Fix apparent typo in tests (pandas-dev#17247) * COMPAT: avoid calling getsizeof() on PyPy closes pandas-dev#17228 Author: mattip <matti.picus@gmail.com> Closes pandas-dev#17229 from mattip/getsizeof-unavailable and squashes the following commits: d2623e4 [mattip] COMPAT: avoid calling getsizeof() on PyPy * CLN: replace %s syntax with .format in pandas.core.reshape (pandas-dev#17252) Replaced %s syntax with .format in pandas.core.reshape. Additionally, made some of the existing positional .format code more explicit. * ENH: Infer compression from non-string paths (pandas-dev#17206) * Fix bugs in IntervalIndex.is_non_overlapping_monotonic (pandas-dev#17238) * BUG: Fix behavior of argmax and argmin with inf (pandas-dev#16449) (pandas-dev#16449) Closes pandas-dev#13595 * CLN: Remove have_pytz (pandas-dev#17266) Closes pandas-devgh-17251 * CLN: replace %s syntax with .format in core.dtypes and core.sparse (pandas-dev#17270) * Replace imports of * with explicit imports (pandas-dev#17269) xref pandas-dev#17234 * TST: pytest deprecation warnings GH17197 (pandas-dev#17253) Test parameters with marks are updated according to the updated API of Pytest. https://docs.pytest.org/en/latest/changelog.html#pytest-3-2-0-2017-07-30 https://docs.pytest.org/en/latest/parametrize.html * Handle more date/datetime/time formats (pandas-dev#15871) * DOC: add example on json_normalize (pandas-dev#16438) * BUG: Have object dtype for empty Categorical.categories (pandas-dev#17249) * BUG: Have object dtype for empty Categorical ctor Previously we had a `Float64Index`, which is inconsistent with, e.g., the regular Index constructor. * TST: Update tests in multi for new return Previously these relied worked around the return type by wrapping list-likes in `np.array` and relying on that to cast to float. These workarounds are no longer nescessary. * TST: Update union_categorical tests This relied on `NaN` being a float and empty being a float. Not a necessary test anymore. * TST: set object dtype * CLN: replace %s syntax with .format in pandas.tseries (pandas-dev#17290) * TST: parameterize consistency tests for rolling/expanding windows (pandas-dev#17292) * FIX: define `DataFrame.items` for all versions of python (pandas-dev#17214) * PERF: Update ASV publish config (pandas-dev#17293) Stricter cutoffs for considering regressions [ci skip] * DOC: Expand docstrings for head / tail methods (pandas-dev#16941) * MAINT: Use set literal for unsupported + depr args Initializes unsupported and deprecated argument sets with set literals instead of the set constructor in pandas/io/parsers.py, as the former is slightly faster than the latter. * DOC: Add proper docstring to maybe_convert_indices Patches several spelling errors and expands current doc to a proper doc-string. * DOC: Improving docstring of take method (pandas-dev#16948) * BUG: Fixed regex in asv.conf.json (pandas-dev#17300) In pandas-dev#17293 I messed up the syntax. I used a glob instead of a regex. According to the docs at http://asv.readthedocs.io/en/latest/asv.conf.json.html#regressions-thresholds we want to use a regex. I've actually manually tested this change and verified that it works. [ci skip] * Remove unnecessary usage of _TSObject (pandas-dev#17297) * BUG: clip should handle null values closes pandas-dev#17276 Author: Michael Gasvoda <mgasvoda@mercatus.gmu.edu> Author: mgasvoda <mgasvoda01@gmail.com> Closes pandas-dev#17288 from mgasvoda/master and squashes the following commits: a1dbdf2 [mgasvoda] Merge branch 'master' into master 9333952 [Michael Gasvoda] Checking output of tests 4e0464e [Michael Gasvoda] fixing whatsnew text c442040 [Michael Gasvoda] formatting fixes 7e23678 [Michael Gasvoda] formatting updates 781ea72 [Michael Gasvoda] whatsnew entry d9627fe [Michael Gasvoda] adding clip tests 9aa0159 [Michael Gasvoda] Treating na values as none for clips * BUG: fillna returns frame when inplace=True if value is a dict (pandas-dev#16156) (pandas-dev#17279) * CLN: Index.append() refactoring (pandas-dev#16236) * DEPS: set min versions (pandas-dev#17002) closes pandas-dev#15206, numpy >= 1.9 closes pandas-dev#15543, matplotlib >= 1.4.3 scipy >= 0.14.0 * CLN: replace %s syntax with .format in core.tools, algorithms.py, base.py (pandas-dev#17305) * BUG: Fix strange behaviour of Series.iloc on MultiIndex Series (pandas-dev#17148) (pandas-dev#17291) * DOC: Add module doc-string to tseries/api.py * MAINT: Clean up docs in pandas/errors/__init__.py * CLN: replace %s syntax with .format in missing.py, nanops.py, ops.py (pandas-dev#17322) Replaced %s syntax with .format in missing.py, nanops.py, ops.py. Additionally, made some of the existing positional .format code more explicit. * Make pd.Period immutable (pandas-dev#17239) * Bug: groupby multiindex levels equals rows (pandas-dev#16859) closes pandas-dev#16843 * BUG: Cannot use tz-aware origin in to_datetime (pandas-dev#16842) closes pandas-dev#16842 Author: step4me <prosikeffect@gmail.com> Closes pandas-dev#17244 from step4me/step4me-feature and squashes the following commits: 09d051d [step4me] BUG: Cannot use tz-aware origin in to_datetime (pandas-dev#16842) * Replace usage of total_seconds compat func with timedelta method (pandas-dev#17289) * CLN: replace %s syntax with .format in core/indexing.py (pandas-dev#17357) Progress toward issue pandas-dev#16130. Converted old string formatting to new string formatting in core/indexing.py. * DOC: Point to dev-docs in issue template (pandas-dev#17353) [ci skip] * CLN: remove total_seconds compat from json (pandas-dev#17341) * CLN: Move test_intersect_str_dates (pandas-dev#17366) Moves test_intersect_str_dates from tests/indexes/test_range.py to tests/indexes/test_base.py. * BUG: Respect dups in reindexing CategoricalIndex (pandas-dev#17355) When the indexer is identical to the elements. We should still return duplicates when the indexer contains duplicates. Closes pandas-devgh-17323. * Unify Index._dir_* with Series implementation (pandas-dev#17117) * BUG: make order of index from pd.concat deterministic (pandas-dev#17364) closes pandas-dev#17344 * Fix typo that causes several NaT methods to have incorrect docstrings (pandas-dev#17327) * CLN: replace %s syntax with .format in io/formats/format.py (pandas-dev#17358) Progress toward issue pandas-dev#16130. Converted old string formatting to new string formatting in io/formats/format.py. * PKG: Added pyproject.toml for PEP 518 (pandas-dev#16745) Declaring build-time requirements: https://www.python.org/dev/peps/pep-0518/ * DOC: Update Overview page in documentation (pandas-dev#17368) * Update Overview page in documentation * DOC Revise Overview page * DOC Make further revisions in Overview webpage * Update overview.rst Remove references to Panel * API: Have MultiIndex consturctors always return a MI (pandas-dev#17236) * API: Have MultiIndex constructors return MI This removes the special case for MultiIndex constructors returning an Index if all the levels are length-1. Now this will return a MultiIndex with a single level. This is a backwards incompatabile change, with no clear method for deprecation, so we're making a clean break. Closes pandas-dev#17178 * fixup! API: Have MultiIndex constructors return MI * Update for comments

* API: add infer_objects for soft conversions * doc fixups * fixups * doc

API: add infer_objects for soft conversions

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chris-b1 added API Design Dtype Conversions Unexpected or buggy dtype conversions labels Jul 13, 2017

chris-b1 added this to the 0.21.0 milestone Jul 13, 2017

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chris-b1 mentioned this pull request Jul 13, 2017

API: .convert_objects is deprecated, do we want a .convert to replace? #11221

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chris-b1 merged commit 9e7666d into pandas-dev:master Jul 18, 2017

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DOC: infer_objects doc fixup #17018

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jsexauer mentioned this pull request Jul 21, 2017

DEPR: Clean up list of deprecations from prior versions #6581

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alanbato pushed a commit to alanbato/pandas that referenced this pull request Nov 10, 2017

API: add infer_objects for soft conversions (pandas-dev#16915)

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* API: add infer_objects for soft conversions * doc fixups * fixups * doc

rora002 mentioned this pull request Aug 6, 2018

unexpected behavior when using infer_object function #22212

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jreback mentioned this pull request Jun 2, 2019

DEPR: deprecations log for removed issues #13777

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API: add infer_objects for soft conversions #16915

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		@@ -25,6 +25,35 @@ New features
		- Added ``__fspath__`` method to :class:`~pandas.HDFStore`, :class:`~pandas.ExcelFile`,
		and :class:`~pandas.ExcelWriter` to work properly with the file system path protocol (:issue:`13823`)

API: add infer_objects for soft conversions #16915

API: add infer_objects for soft conversions #16915

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