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MDExOlB1bGxSZXF1ZXN0NzEyNTA2Mjc3
43,021
PERF: internals.concat
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2021-08-13T16:58:23Z
2021-08-13T21:48:48Z
2021-08-13T21:16:50Z
MEMBER
null
Nothing big, just a few things found while trying to figure out the slightly-different ArrayManager behavior.
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970,576,490
MDU6SXNzdWU5NzA1NzY0OTA=
43,022
BUG: `pd.testing.assert_frame_equal` fails if nested `DataFrame` contains `np.nan`
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2021-08-13T17:05:12Z
2021-08-22T18:56:54Z
null
NONE
null
- [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the latest version of pandas. - [ ] (optional) I have confirmed this bug exists on the master branch of pandas. --- **Note**: Please read [this guide](https://matthewrocklin.com/blog/work/2018/02/28...
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MDU6SXNzdWU5NzA1NzcxNzU=
43,023
DOC: rolling return type inconsistent with doc
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2021-08-13T17:06:13Z
2021-08-14T21:54:26Z
2021-08-14T21:54:26Z
CONTRIBUTOR
null
#### Location of the documentation https://pandas.pydata.org/docs/reference/api/pandas.core.window.rolling.Rolling.min.html **Note**: You can check the latest versions of the docs on `master` [here](https://pandas.pydata.org/docs/dev/). #### Documentation problem the return type of rolling methods (rolling....
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43,024
TST: refactor iris_view table creation in SQL test
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2021-08-13T17:58:02Z
2021-08-17T04:20:07Z
2021-08-13T21:16:01Z
MEMBER
null
xref #40686
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MDExOlB1bGxSZXF1ZXN0NzEyNTg3ODM4
43,025
PERF: unstack
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2021-08-13T19:42:26Z
2021-08-18T23:54:46Z
2021-08-18T23:51:29Z
MEMBER
null
- [ ] closes #xxxx - [x] tests added / passed - [x] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them - [ ] whatsnew entry Avoids expensive get_indexer calls. ``` from asv_bench.benchmarks.reshape import * s...
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MDExOlB1bGxSZXF1ZXN0NzEyNjEwMDg1
43,026
Bug in Series constructor returning wrong missing values
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2021-08-13T20:29:34Z
2021-11-13T19:32:50Z
2021-08-19T02:01:55Z
MEMBER
null
- [x] closes #43017 - [x] xref #43018 (if the reindex case is ok, then this is done too) - [x] tests added / passed - [x] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them - [x] whatsnew entry This ensures consist...
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Backport PR #42999 on branch 1.3.x (TST: Fix test related to reverting fastparquet nullable support)
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NONE
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Backport PR #42999: TST: Fix test related to reverting fastparquet nullable support
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DEPR: Int64Index, UInt64Index & Float64Index
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2021-08-13T23:20:50Z
2021-09-02T04:55:25Z
2021-09-01T23:01:48Z
CONTRIBUTOR
null
* [x] xref #42717 * [x] xref #41153 & #42706 Deprecates Int64Index, UInt64Index & Float64Index. I don't think it will be sensible to emit a deprecation warning for these because they have a lot of internal usage as is, so I've just added texts explaining that these are deprecated and will be removed in Pandas 2....
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43,029
DOC: Ensure pandas warnings & exceptions are always documented in API docs
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2021-08-18T15:58:27Z
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- [x] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them Also adds a pre-commit check that errors in `doc/source/reference/general_utility_functions.rst` are synced with `pandas/errors/__init__.py`
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43,030
DOC: Clarify dtype of returned object from window ops
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2021-08-14T00:11:26Z
2021-08-14T21:54:29Z
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MEMBER
null
- [x] closes #43023 - [x] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them
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43,031
ENH: IntervalArray/IntervalIndex Range Joins
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2021-08-14T01:43:48Z
2021-11-03T14:25:16Z
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NONE
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#### Is your feature request related to a problem? I'm interested in adding additional options that would modify the behavior of merge, join, and concatenate operations when performed between IntervalArrays or IntervalIndexes. There has been a fair amount of related discussion in a number of somewhat stale issues...
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43,032
Add example
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2021-08-14T05:17:38Z
2021-08-15T16:36:04Z
2021-08-15T15:51:51Z
NONE
null
Add example to `reorder_levels` function of Pandas DataFrame
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43,033
DOC: arguments options correction
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2021-08-14T06:42:29Z
2021-08-17T05:20:53Z
2021-08-16T20:27:22Z
CONTRIBUTOR
null
oversight in recent method addition for 1.4.0 / 1.3.2. backport. no release note necessary. Can also be backported to 1.3.2.
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43,034
BUG: don't manipulate `styler` object due to args in `to_html`
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2021-08-14T07:05:08Z
2021-08-19T17:10:43Z
2021-08-19T16:13:56Z
CONTRIBUTOR
null
This is the same as #42323 except for `to_html` instead of `to_latex`.
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BUG: nlargest/nsmallest does not act in accordance with documentaion
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2021-08-14T07:15:46Z
2021-08-15T23:31:53Z
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CONTRIBUTOR
null
- [x] closes #42997 - [x] tests added / passed - [x] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them - [x] whatsnew entry nsmallest/nlargest are now consistent with x.sort_values(ascending=False).head(n)/x.sort_...
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DOC: Additional Items for the Cheat Sheet
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2021-10-31T00:43:10Z
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- https://github.com/pandas-dev/pandas/issues/40680 - Added Plotting Functions - Added a 3rd page consisting of various plots - Adjusted the 2nd page and added a snippet to 'Drop a Column'
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43,037
REF: address the floating "_" in `styler.uuid`
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2021-08-14T14:51:27Z
2021-08-17T17:15:24Z
2021-08-17T16:03:19Z
CONTRIBUTOR
null
addresses the issue whereby the set uuid at initialisation has a floating underscore: ```python >>> styler = Styler(df, uuid="abc") >>> print(styler.uuid) abc_ ``` Note: This is v minor but was discovered, and is useful to fix, due to an upcoming PR.
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BUG: Compare type `int64` with `Int64` fails
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2021-08-14T15:50:55Z
2021-11-20T13:13:10Z
null
NONE
null
- [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the latest version of pandas. - [ ] (optional) I have confirmed this bug exists on the master branch of pandas. --- **Note**: Please read [this guide](https://matthewrocklin.com/blog/work/2018/02/28...
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43,039
BUG: interpolation with duplicate index values fails (#42585)
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2021-08-14T16:59:45Z
2021-10-16T20:27:56Z
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NONE
null
- [ ] closes #42585 - [ ] tests added / passed - [ ] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them - [ ] whatsnew entry
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TST: refactor types table in SQL test
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2021-08-14T19:25:08Z
2021-08-17T14:28:04Z
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MEMBER
null
xref #40686
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Fix len one list dataframe constructor bug for datetime
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2021-08-14T19:30:31Z
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MEMBER
null
- [x] closes #42810 - [x] tests added / passed - [x] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them - [x] whatsnew entry
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BUG: byteorder (endian) error for int64 and int32
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2021-08-14T20:03:38Z
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NONE
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- [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the latest version of pandas. - [ ] (optional) I have confirmed this bug exists on the master branch of pandas. --- **Note**: Please read [this guide](https://matthewrocklin.com/blog/work/2018/02/28...
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BUG: JoinUnit._is_valid_na_for
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2021-08-14T20:52:22Z
2021-08-16T21:47:04Z
2021-08-16T20:48:34Z
MEMBER
null
Fixing this unblocks a refactor to share some code with the ArrayManager logic which I _think_ will fix some of the broken ArrayManager cases.
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43,044
BUG: also copy `uuid` in `Styler.copy`
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2021-08-15T06:09:44Z
2021-08-19T05:20:47Z
2021-08-18T23:52:23Z
CONTRIBUTOR
null
due after #43037 When a `styler` is copied this PR makes sure the set `uuid` is also copied. (also helps with an upcoming PR).
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1.3.2 release date
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DOC: Start v1.3.3 release notes
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MEMBER
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~~will fail till v1.3.2 tag exists~~
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TST: cleanup of any_* test fixtures GH38017
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2021-08-18T17:22:43Z
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CONTRIBUTOR
null
- [X] closes #38017 - [ ] tests added / passed - [X] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them - [ ] whatsnew entry
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43,048
REF: use `_get_axis_number` instead of `if axis in [...]`:
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38
2021-08-15T10:23:54Z
2021-08-31T10:04:44Z
2021-08-31T10:04:18Z
CONTRIBUTOR
null
This PR regards searching the **non-test codebase** (i.e. don't find code examples in pandas/tests) for examples like the following: Try to find and replace logic like: ```python if axis in [0, "index"]: ... elif axis in [1, "columns"]: ... else: ... ``` with the standard codebase method `ge...
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Backport PR #43045 on branch 1.3.x (1.3.2 release date)
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2021-08-15T10:41:48Z
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MEMBER
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Backport PR #43045
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RLS: 1.3.3
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2021-08-15T13:26:34Z
2021-09-12T20:30:04Z
2021-09-12T20:30:04Z
MEMBER
null
Tracking issue for the 1.3.3 release. Currently scheduled for September 05, 2021. https://github.com/pandas-dev/pandas/milestone/89 List of open regressions: https://github.com/pandas-dev/pandas/issues?q=is%3Aopen+is%3Aissue+label%3ARegression performance regressions between 1.2.5 and 1.3.x https://simonjayhaw...
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DOC: Typo fix in "Extending Pandas"
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2021-08-15T13:39:41Z
2021-08-15T17:07:51Z
2021-08-15T17:07:44Z
CONTRIBUTOR
null
Fixes typo in docs `Dataframe` -> `DataFrame`
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REGR: window ewm slowdown
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2021-08-15T14:34:05Z
2021-08-16T21:01:55Z
2021-08-16T20:26:59Z
MEMBER
null
- [x] closes #42333 - [x] tests added / passed - [x] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them - [x] whatsnew entry (will move once 1.3.3 notes merged) ``` - 3.22±0.09ms 1.29±0.3ms 0.40 roll...
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ENH: Allow for passing in engine_kwargs to read_excel
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2021-08-15T14:59:14Z
2021-08-16T22:51:54Z
null
NONE
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#### Is your feature request related to a problem? In experimenting with openpyxl, I have found that I can load my files in faster when read_only=True, and I would like to pass in that argument to read_excel #### Describe the solution you'd like Similar to ExcelWriter, I would like to have engine_kwargs added ...
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REGR: SeriesGrouper using Timestamp index
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2021-08-15T15:41:09Z
2021-08-17T17:09:09Z
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MEMBER
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- [x] closes https://github.com/pandas-dev/pandas/issues/42390 - [x] tests added / passed - [x] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them - [x] whatsnew entry Not sure what the defining characteristic of th...
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Backport PR #43046 on branch 1.3.x (DOC: Start v1.3.3 release notes)
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2021-08-15T17:13:11Z
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Backport PR #43046: DOC: Start v1.3.3 release notes
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ENH:included anti join functionality
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2021-08-15T18:10:49Z
2021-11-07T00:03:41Z
null
CONTRIBUTOR
null
- [x] closes #42916 - [x] tests added / passed - [x] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them - [ ] whatsnew entry Extremely naive implementation. Happy to take suggestions.
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43,057
Doc test errors
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2021-08-15T18:48:03Z
2021-08-15T18:53:46Z
2021-08-15T18:53:46Z
CONTRIBUTOR
null
- [ ] closes #42907 - [ ] tests added / passed - [ ] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them - [ ] whatsnew entry
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43,058
fixed transform docs
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2021-08-15T18:55:51Z
2021-10-16T20:25:11Z
2021-10-16T20:25:10Z
CONTRIBUTOR
null
- [ ] closes #42907 - [ ] tests added / passed - [ ] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them - [ ] whatsnew entry
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PERF: read_stata
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2021-08-15T19:42:59Z
2021-08-18T00:50:25Z
2021-08-18T00:07:52Z
MEMBER
null
``` from asv_bench.benchmarks.io.stata import * self = StataMissing() self.setup("tc") %timeit self.time_read_stata("tc") 150 ms ± 3.3 ms per loop (mean ± std. dev. of 7 runs, 10 loops each) # <- master 114 ms ± 2.81 ms per loop (mean ± std. dev. of 7 runs, 10 loops each) # <- PR ``` cc @bashtage
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BUG: nlargest/nsmallest can now consider nan values like sort_values(ascending=True).head(n)
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2021-08-15T23:33:31Z
2021-09-07T23:17:44Z
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CONTRIBUTOR
null
- [x] closes #28984 - [x] tests added / passed - [x] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them - [x] whatsnew entry nsmallest/nlargest are now consistent with x.sort_values(ascending=False).head(n)/x.sort_...
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DOC: Updating grammar for clarity and consistency
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2021-08-15T23:39:54Z
2021-08-17T18:47:25Z
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CONTRIBUTOR
null
### Location of the documentation [10 minutes to pandas](https://pandas.pydata.org/pandas-docs/stable/user_guide/10min.html) ### Documentation problem Throughout the page, there are code examples with an accompanying explanation of what is happening. The explanation will sometimes end in a colon, and other times e...
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Update frame.py
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2021-08-16T01:27:10Z
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CONTRIBUTOR
null
Built the example inside the docstring and removed the unnecessary inplace=true - [x] closes #xxxx - [x] tests added / passed - [x] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them - [x] whatsnew entry
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BENCH: fix misleading json asvs
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2021-08-16T01:55:37Z
2021-08-17T14:22:08Z
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MEMBER
null
a third of the measured time is in concat ATM, which isnt what we're trying to measure
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2021-08-16T04:31:42Z
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CONTRIBUTOR
null
- [x] closes #32803 - [x] tests added / passed - [x] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them - [x] whatsnew entry
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REF: Move BaseIndexers and indexer.py functions into their own directory
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2021-08-19T00:02:49Z
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MEMBER
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- [x] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them In preparation for unifying some `numba` code between groupby and rolling, moving `BaseIndexer`s to a new directory such that `pandas/core/window.indexers.py`...
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TST: df.combine_first duplicates rows for nan index values (#39881)
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CONTRIBUTOR
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- [x] closes #39881 - [x] tests added / passed - [x] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them - [ ] whatsnew entry (n/a - added test case only)
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BUG: pd.concat produces an invalid index in case of duplicates
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2021-08-16T15:14:10Z
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NONE
null
#### Problem description When using `pd.concat` with the `keys` parameter, on a Series/Dataframe who's index contains duplicate entries, concat ignores these duplicate value and generates an **invalid MultiIndex**, with different "codes" for the same label. further down the line, this breaks `df.groupby(level=[0,...
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BUG : pandas.DataFrame.to_excel function not working in pandas 1.3.1
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- [✅ ] I have checked that this issue has not already been reported. - [ ✅] I have confirmed this bug exists on the latest version of pandas. - [ ] (optional) I have confirmed this bug exists on the master branch of pandas. --- **Note**: Please read [this guide](https://matthewrocklin.com/blog/work/2018/02/...
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Backport PR #43052 on branch 1.3.x (REGR: window ewm slowdown)
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Backport PR #43052: REGR: window ewm slowdown
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Backport PR #43033: DOC: arguments options correction
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- [ ] closes #xxxx - [ ] tests added / passed - [ ] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them - [ ] whatsnew entry This came up while I was benchmarking the pyarrow csv reader that I am planning to PR soon,...
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ENH: Add Arrow CSV Reader
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- [ ] closes #23697 - [ ] tests added / passed - [ ] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them - [ ] whatsnew entry Picking up from #38370. Perf is OK. (StringIO/Text buffer reading gets like 20% overhead...
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Shaves 7-10% off of time_copy_overhead_single_col
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BUG: pandas.read_csv with no schema gives corrupted data
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BUG: pandas 1.3.2 incompatible with fastparquet 0.7.0
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Backport PR #43041: Fix len one list dataframe constructor bug for datetime
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REF: `axis in [...]` becomes `_get_axis_number(axis)` in Styler
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CONTRIBUTOR
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- [x] address an item in #43048
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BUG: dt.tz_convert() on categorical[datetime] resets index
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Backport PR #43054: REGR: SeriesGrouper using Timestamp index
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xref #40686
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43,084
ENH: clearer error messages for `xlrd` and `openpyxl` issues
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2021-08-17T17:41:57Z
2021-08-18T23:46:19Z
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#### Is your feature request related to a problem? While using the `scipy-notebook` image from Jupyter, which installs `pandas` and `xlrd` but not `openpyxl` (full dependency list [here](https://github.com/jupyter/docker-stacks/blob/master/scipy-notebook/Dockerfile#L19)), I attempted to open a `.xlsx` file using `pd...
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972,932,646
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43,085
BUG: pandas.DataFrame.reindex - sample code to expand the dataframe as given in the API reference is not working
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2021-08-17T17:55:46Z
2021-08-18T18:17:03Z
2021-08-18T18:17:02Z
NONE
null
- [x ] I have checked that this issue has not already been reported. - [x ] I have confirmed this bug exists on the latest version of pandas. - [ ] (optional) I have confirmed this bug exists on the master branch of pandas. --- #### Code Sample, a copy-pastable example date_index = pd.date_range('1/1/201...
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#fixed syntax and grammatical errors, Added quick notes for simple go - through/ follow-ups
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2021-08-17T18:34:55Z
2021-08-17T19:58:20Z
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… through. (Open to further updates) #fixed syntax and grammatical errors, Added quick notes for simple go through. (Open to further updates) - [x] closes #xxxx - [x] tests added / passed - [x] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code...
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43,087
BUG: Inconsistent column order result using Left Merge depending if left dataframe is empty or not
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- [X] I have checked that this issue has not already been reported. There is a similar report but using "outer join" instead of "left join": https://github.com/pandas-dev/pandas/issues/9937 - [X] I have confirmed this bug exists on the latest version of pandas. Is present at least in the last version I can install...
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ENH: Rename ExcelWriter to make clear attributes are not public
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2021-08-17T20:40:30Z
2021-09-10T22:48:05Z
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MEMBER
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Ref: https://github.com/pandas-dev/pandas/issues/43068#issuecomment-900504112 Copying from the comment above: > The [documentation](https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.ExcelWriter.html) of `ExcelWriter` says: "None of the methods and properties are considered public.". It seems th...
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Added some more concepts and 3rd page #Update #CheatSheet #Pandas
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- [x] closes #xxxx - [x] tests added / passed - [x] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them - [x] whatsnew entry
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Here is the solution to issue #43085 Basically, you have to make sure that the df2 after reindexing is stored again in df2
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2021-08-17T22:01:03Z
2021-08-18T05:28:50Z
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- [ ] closes #43085
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43,091
BUG: Change of behavior in casting of datetime-like types in MultiIndex
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2021-08-18T02:22:01Z
2021-11-19T09:58:44Z
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rom
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- [ ] closes #xxxx - [answer.pdf](https://github.com/pandas-dev/pandas/files/7004115/answer.pdf) [ ] tests added / passed - [ ] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them - [ ] whatsnew entry
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BUG: inconsistent behaviour when grouping DataFrame by week and month, as compared to minutes, hours and days??
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2021-08-18T04:40:35Z
2021-08-19T16:09:43Z
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In computer science, we always try to design algorithms and procedures in a logically consistent manner so that other people can follow easily without making wrong assumptions. For example, when we group dates into intervals, for every group we can choose to use either the left or the right boundary to label that group...
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ENH:why we don't have an axis called column
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2021-08-18T08:28:26Z
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### The Problem Currently, we can select the `axis` by typing `0` `1` `index`. But why we can't select the axis also by typing `column`. Personally, I prefer to use `index` as an axis as this makes my code clean. #### The solution Check for the key world `column` as an axis if so this means it is the same as ...
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#latest features update
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2021-08-18T11:42:07Z
2021-08-18T12:10:55Z
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- [x] closes #xxxx - [x] tests added / passed - [x] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them - [x] whatsnew entry
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BUG: `pd.merge` mixes up the left/right index/on keys in result
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- [ ] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the latest version of pandas. - [ ] (optional) I have confirmed this bug exists on the master branch of pandas. I was reviewing the recent PR for anti-joins and was attempting to come up with a standard te...
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DOC: `styler.format` does not, in fact, raise a KeyError
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2021-08-18T14:57:04Z
2021-08-19T05:23:02Z
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CONTRIBUTOR
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This was actually never true from the start #40134. It might have been true at one point during the PR and then was overwritten without docs being corrected before final merge. I.e. these docs have always been wrong since introduction. Should be back portable. ```python df = DataFrame([[1.0, 2.0]], columns=["...
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MEMBER
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xref #40686
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REF: ensure to_arrays returns matched-length arrays/columns
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ATM we pass both 'columns' and `arr_names` to arrays_to_mgr and create_block_manager_from_arrays. This is part of en effort to align these before calling arrays_to_mgr, which will let us improve the performance of _form_blocks.
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Backport PR #43097: DOC: `styler.format` does not, in fact, raise a KeyError
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ENH: `Styler.format_index()` to display index values similarly to data-values with `format()`
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CONTRIBUTOR
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- [x] adds features and method with docstrings - [x] update user guide - [x] whats new - [x] add tests This PR adds the method `format_index` so that the typical `format` routines can also be applied to display the index labels and columns headers of a Styler. With all the recent functionality here is a comple...
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BUG: IndexError when header rows have unequal column counts
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- [x] I have checked that this issue has not already been reported. I couldn't find it with a search on `indexerror read_csv` anyway - [x] I have confirmed this bug exists on the latest version of pandas. - [ ] (optional) I have confirmed this bug exists on the master branch of pandas. --- **Note**: Plea...
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- [ ] closes #xxxx - [ ] tests added / passed - [ ] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them - [ ] whatsnew entry
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REF: reorder_arrays handle missing
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By doing this here, we avoid the need to do it in _form_blocks. In conjunction with #43099 this will let us simplify _form_blocks quite a bit, which I am optimistic will be a nice performance bump.
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- [x] closes #40145 - [x] tests added / passed - [x] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them - [x] whatsnew entry
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ENH: MultiIndex dtypes property
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More explicit (in my point of view), user friendly dtypes access to multiindex, dataframe like
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CONTRIBUTOR
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This PR replaces namedtuple with dataclass in pandas/core/groupby/base.py and closes #40531. The parameters `order` and `frozen` is set equal to True to make sure that that behaviour of OutputKey does not change.
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BUG: Regression from 1.2.5 to 1.3.x: groupby using sum on DataFrame containing lists fails
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- [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the latest version of pandas. - [x] (optional) I have confirmed this bug exists on the master branch of pandas. --- #### Code Sample, a copy-pastable example Version 1.3.2: ```python >>> df=p...
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- [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the latest version of pandas. (1.3.1) - [ ] (optional) I have confirmed this bug exists on the master branch of pandas. --- #### Code Sample, a copy-pastable example This succeeds: ```python pd.Dat...
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REF: arrays_to_manager dont need names
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- [ ] closes #xxxx - [ ] tests added / passed - [ ] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them - [ ] whatsnew entry In turn this means that create_block_manager_from_arrays doesnt need `columns`, but bc that...
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NONE
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Replaced all the if axis in [..] with _get_axis_number.
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TYP: annotate matching dtypes
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2021-08-19T18:24:35Z
2021-08-24T16:26:48Z
2021-08-24T16:26:48Z
MEMBER
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e.g. in `Index._get_fill_indexer` we can work out that `target.dtype` should match `self.dtype`. It would be nice if we could get that into the annotation. cc @simonjayhawkins ``` # current def _get_fill_indexer(self, target: Index, ...): # desired? def _get_fill_indexer(self: Index[MyDtype], target: Index[M...
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43,114
REF: names no longer needed in _form_blocks, create_block_manager_from_arrays
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2021-08-19T21:22:58Z
2021-08-20T18:11:31Z
2021-08-20T00:57:56Z
MEMBER
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1) copy/paste create_block_manager_from_arrays and _form_blocks to the pseudo-public internals.api 2) rename create_block_manager_from_arrays -> create_block_manager_from_column_arrays 3) prune no-longer-needed args from create_block_manager_from_arrays, _form_blocks Two follow-ups after this: 4) remove no-longer...
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43,115
PERF: GroupBy.std operate blockwise instead of column-wise
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2021-08-19T22:58:09Z
2021-08-20T01:53:24Z
2021-08-20T00:56:55Z
MEMBER
null
The relevant cython code already supports 2D, so this is a super-simple fix.
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EHN: partially upgrade sql module for SQLAlchemy 2.0 compat
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2021-08-19T23:20:43Z
2021-08-20T15:18:11Z
2021-08-20T12:38:21Z
MEMBER
null
xref #40686
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Typo fixes
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2021-08-20T03:26:49Z
2021-08-22T20:48:45Z
2021-08-22T20:48:21Z
NONE
null
- [x] closes #39158 - [x] tests added / passed - [x] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them - [x] Fixed typo in pandas/io/parser/c_parser_wrapper.py
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BUG: Throw a ParserError when header rows have unequal column counts …
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2021-08-20T05:28:07Z
2021-09-05T17:39:58Z
2021-09-05T15:59:21Z
CONTRIBUTOR
null
(GH43102) - closes #43102 - Fixed uncaught IndexError that is raised when the iterator `i` in `extract(r)` inside base_parser.py exceeds the length of a header row (when `field_count > len(r)`). - A Parser error is raised when the header row had unequal columns. Outputs the first row where a mismatch is found. -...
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BUG: 'assign' on empty DataFrame with dtype=string column gives "ValueError: StringArray requires a sequence of strings or pandas.NA"
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2021-08-20T06:10:16Z
2021-08-28T17:54:16Z
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NONE
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- [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the latest version of pandas. - [ ] (optional) I have confirmed this bug exists on the master branch of pandas. --- **Note**: Please read [this guide](https://matthewrocklin.com/blog/work/2018/02/28...
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REF: used _get_axis_number instead of if axis in [...]: #43048
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2021-08-20T07:02:28Z
2021-08-20T07:13:32Z
2021-08-20T07:13:32Z
NONE
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Changed the axis in [..] to _get_axis_number.
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