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https://api.github.com/repos/pandas-dev/pandas/issues/39819
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808,620,607
MDExOlB1bGxSZXF1ZXN0NTczNjMwNjky
39,819
[WIP] ENH: Add only_unique group-by aggregation method
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4
2021-02-15T15:16:52Z
2021-02-15T19:51:46Z
2021-02-15T19:24:39Z
CONTRIBUTOR
null
I think it would be useful to have a "only unique value" aggregation method. I've implemented a straw-man version so far to get some feedback before I do any more. - [x] closes #xxxx N/A - [ ] tests added / passed - [ ] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development...
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39,820
REF: call ensure_wrapped_if_datetimelike before the array arithmetic_op
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2021-02-15T15:21:36Z
2021-04-22T22:34:09Z
2021-04-22T22:16:51Z
MEMBER
null
~This is on top of https://github.com/pandas-dev/pandas/pull/39772, so only the last commit needs to be looked at for now: https://github.com/pandas-dev/pandas/pull/39820/commits/bd50388e019c61559c310638186aeea57d2d2d3e~ The actual goal here is to have a version of [`array_ops.py::arithmetic_op`](https://github.com/...
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39,821
ENH: Styler builtins: `highlight_between`
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2021-02-15T16:56:49Z
2021-04-13T14:32:38Z
2021-04-13T14:16:42Z
CONTRIBUTOR
null
- [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 - [x] update docs for existing highlight functions for consistency - [x] add a new `props` argument to existin...
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39,822
CI: upload coverage report to Codecov
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2021-02-15T17:38:42Z
2021-03-18T16:40:49Z
2021-02-15T23:02:44Z
MEMBER
null
After moving the coverage build from Travis to GitHub Actions #38344, coverage upload was stopped. Trying to add it back using action provided by codecov. https://github.com/codecov/codecov-action
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39,823
Raise an error on redundant definition of separator in read_csv
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2021-02-15T18:18:38Z
2021-05-26T02:18:15Z
2021-05-26T02:18:15Z
NONE
null
#### Is your feature request related to a problem? When calling `read_csv` and specifying both `sep` and `delim_whitespace`, or both `delimiter` and `delim_whitespace` I get a `ValueError` in pandas 1.3.0.dev0+713.g9f792cd903. For example: `df = pd.read_csv("my_data.csv", sep=' ', delim_whitespace=True)` and `df = ...
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39,824
REF: remove unnecessary Block attrs
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2021-02-15T18:52:09Z
2021-02-16T17:55:16Z
2021-02-16T16:52:18Z
MEMBER
null
- [ ] 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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39,825
PERF: use arr.size instead of np.prod(arr.shape) in _can_use_numexpr
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2021-02-15T19:19:54Z
2021-02-17T07:09:29Z
2021-02-16T22:55:57Z
MEMBER
null
xref https://github.com/pandas-dev/pandas/pull/39772 Using `np.prod` gives quite some overhead, and I *think* it's always equivalent to `.size` ? ``` In [1]: arr = np.random.randn(3, 2) In [2]: %timeit arr.size 42.8 ns ± 0.628 ns per loop (mean ± std. dev. of 7 runs, 10000000 loops each) In [3]: %timeit n...
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39,826
Dont raise exception when subattr was not found in JSON parsing
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39,827
Backport PR #39800 on branch 1.2.x (Regression in to_excel when setting duplicate column names)
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2021-02-15T22:43:06Z
2021-02-16T09:41:00Z
2021-02-16T09:41:00Z
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Backport PR #39800: Regression in to_excel when setting duplicate column names
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39,828
BUG: PandasArray._from_sequence with list-of-tuples
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2021-02-15T23:15:00Z
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2021-02-17T01:33:01Z
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null
- [ ] 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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39,829
BUG: DataFrame.append broken on master
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2021-02-16T02:05:55Z
2021-02-16T04:02:37Z
2021-02-16T04:02:07Z
MEMBER
null
Should get the CI to green.
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39,830
ENH: Hand numpy-like arrays with is_list_like
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2021-02-16T02:25:41Z
2021-06-16T13:31:13Z
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CONTRIBUTOR
null
- [ ] follows #39852 - [x] 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/REF: share Series setitem tests
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MEMBER
null
- [ ] 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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TST/REF: collect tests by method
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February 2021 Docs Meeting
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2021-02-25T15:10:20Z
2021-02-25T15:10:19Z
MEMBER
null
- [Thursday, February 25th at 9-10am US Eastern Time](https://everytimezone.com/s/f469edb9) - [Zoom link](https://nyu.zoom.us/j/98201283174?pwd=d0VoUy9GTDRlVVZ0cCtTK0s4NnlBZz09) - [Agenda/notes](https://docs.google.com/document/d/1JoiqTdK6gi5W1QiTWrqtTV-rNmIqU3xROgHY5iT4J5g/edit#heading=h.1obsyhexqytc) --- ~~Pl...
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DEPS: change clipboard backend to pyclip
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2021-02-16T05:31:24Z
2021-08-15T18:13:14Z
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MEMBER
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Currently, we are using a vendered version of [pyperclip](https://github.com/asweigart/pyperclip). This project was dead for a couple of years. And there were some updates in 2020. But, it's not under active development right now. Recently I found this project [pyclip](https://github.com/spyoungtech/pyclip). It loo...
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CI: prevent false negatives in builds for pull requests
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2021-02-16T06:16:21Z
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MEMBER
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- [x] I have checked that this issue has not already been reported. - [ ] ~~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. --- #### Problem description This issue is a bit vague, because I'm not sure that I...
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39,836
CI: remove stale assignments
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2021-02-16T07:19:15Z
2021-06-18T01:36:13Z
2021-06-18T01:36:13Z
MEMBER
null
Use a third-party GitHub Action to handle the claiming of issues. [See it in action.](https://github.com/afeld/pandas/issues/2#issuecomment-779635007) It also handles automatically unassigning them after a period of inactivity, which is the more interesting part. The motivation here is that I bet there are a lot of ...
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809,118,878
MDU6SXNzdWU4MDkxMTg4Nzg=
39,837
BUG: AttributeError: 'BlockManager' object has no attribute 'is_mixed_type' when trying to jsonify dataframe.
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6
2021-02-16T09:03:28Z
2021-03-23T15:17:56Z
2021-03-23T15:17:56Z
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 ```python csv_reader = pandas.read_c...
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809,149,307
MDU6SXNzdWU4MDkxNDkzMDc=
39,838
BUG: Problems round-tripping categoricals to/from parquet
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2021-02-16T09:43:07Z
2021-08-15T18:18:20Z
2021-08-15T18:18:20Z
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 ```python import os import pandas a...
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MDU6SXNzdWU4MDkxNjM1NTY=
39,839
BUG: When checking equality of column dtype - TypeError: Cannot interpret 'datetime64[ns, UTC]' as a data type
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2021-02-16T10:01:55Z
2021-08-15T18:20:15Z
2021-08-15T18:20:15Z
NONE
null
This code reproduces the error: ```python import pandas as pd df = pd.DataFrame([{'publish_time': pd.Timestamp('2017-11-13 17:13:01+0000', tz='UTC'), 'title': 'A'}, {'publish_time': pd.Timestamp('2017-11-13 07:30:00+0000', tz='UTC'), 'title': 'B'}, ...
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809,207,038
MDExOlB1bGxSZXF1ZXN0NTc0MTA3Mzkx
39,840
TST: JSON with tz roundtrip
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2021-02-16T10:55:40Z
2021-02-16T18:03:40Z
2021-02-16T13:51:36Z
CONTRIBUTOR
null
test was ignored previously cause `tz` not supported. was fixed by PR #35973 might as well include the test now.
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809,257,191
MDExOlB1bGxSZXF1ZXN0NTc0MTQ5NTIy
39,841
[ArrayManager] Implement concat with axis=1 (merge/join)
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2021-02-16T12:10:09Z
2021-02-23T21:21:51Z
2021-02-23T10:13:44Z
MEMBER
null
The (hopefully) "easy" part of https://github.com/pandas-dev/pandas/pull/39612 for which there seems less discussion: this separates the pieces from https://github.com/pandas-dev/pandas/pull/39612 that are needed to get `concat` with `axis=1` working (`concat_axis=0`), which at least enables the join / merge usecases.
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MDExOlB1bGxSZXF1ZXN0NTc0MjExOTAw
39,842
Backport PR #39795 on branch 1.2.x (fix benchmark failure with numpy 1.20+)
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2021-02-16T13:53:12Z
2021-02-16T15:34:26Z
2021-02-16T15:34:26Z
NONE
null
Backport PR #39795: fix benchmark failure with numpy 1.20+
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39,843
BUG: Creating empty datetime64[ns] column should not try to use cache
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2021-02-16T14:04:19Z
2021-07-28T13:39:00Z
2021-07-28T13:39:00Z
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 ```python import pandas as pd impor...
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39,844
CI: series_methods.IsInLongSeriesLookUpDominates.time_isin fails with NumPy 1.20+
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2021-02-16T15:17:04Z
2021-07-14T18:19:04Z
2021-07-14T18:19:04Z
MEMBER
null
xref https://github.com/pandas-dev/pandas/pull/38379#discussion_r567753143, benchmarks skipped in #39795 <details> ``` [ 0.00%] ·· Benchmarking existing-py_home_simon_miniconda3_envs_numpy-types_bin_python [ 50.00%] ··· series_methods.IsInLongSeriesLookUpDominates.time_isin ...
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39,845
DOC: Reindexing behaviour of dataframe column-assignment missing
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2021-02-16T16:45:21Z
2021-08-09T06:41:55Z
null
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#### Location of the documentation `pandas.core.indexing.IndexingMixin.loc` `pandas.DataFrame.__setitem__` #### Documentation problem When assigning a `Series` through `df[...] = ...` or `df.loc[...] = `, the `Series`' index is expanded to conform to the `DataFrame`'s, and then values are added according to t...
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39,846
ASV: add benchmarks for groupby cython aggregations
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2021-02-16T16:48:43Z
2021-02-17T10:16:26Z
2021-02-16T23:58:27Z
MEMBER
null
I noticed that we currently don't really have a groupby benchmark that specifically targets the cython aggregations. We have of course benchmarks that call those, but eg `GroupByMethods` is setup in such a way that it's mostly benchmarking the factorization and post-processing (also useful of course), while eg for sum ...
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39,847
QST: Integer floordiv by nullable integer series containing zero
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2021-02-16T19:18:48Z
2021-02-17T08:39:59Z
2021-02-17T08:39:31Z
NONE
null
- [ ] I have searched the [[pandas] tag](https://stackoverflow.com/questions/tagged/pandas) on StackOverflow for similar questions. - [ ] I have asked my usage related question on [StackOverflow](https://stackoverflow.com). --- #### Question about pandas Hello Pandas, while working on cuDF binops, I noticed...
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39,848
ASV: add frame ops benchmarks for varying n_rows/n_columns ratios
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2021-02-16T19:54:43Z
2021-02-17T21:34:38Z
2021-02-17T21:34:38Z
MEMBER
null
Currently, we have a benchmark for frame/frame ops with a wide dataframe (originating from previous (long) PR / discussion about this, xref https://github.com/pandas-dev/pandas/pull/32779) To get a better idea of the trade-offs for future changes to the ops code (eg ArrayManager related), I think it is useful to hav...
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39,849
solved raise an error on redundant definition (#39823)
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2021-02-16T21:19:22Z
2021-02-22T06:09:35Z
2021-02-22T06:09:35Z
CONTRIBUTOR
null
- [ ] closes #39823 - [ ] 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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39,850
BUG: float formatters ignore "object" extension type; Other issues in same code
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2021-02-16T21:24:42Z
2021-07-02T11:30:48Z
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. --- #### Code Sample, a copy-pastable example ```python import pandas as pd df = ...
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39,851
DOC: Add list of UDF methods to mutation gotcha
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2021-02-16T22:16:34Z
2021-02-17T22:16:26Z
2021-02-16T23:35:09Z
MEMBER
null
- [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 Ref: https://github.com/pandas-dev/pandas/pull/39762#discussion_r575832330
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PERF: is_list_like
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2021-02-16T22:38:04Z
2021-02-17T21:01:57Z
2021-02-17T20:11:52Z
MEMBER
null
``` In [3]: arr = np.array(0) In [4]: arr2 = np.array([0]) In [5]: %timeit is_list_like([]) 118 ns ± 2.21 ns per loop (mean ± std. dev. of 7 runs, 10000000 loops each) # <-- PR 328 ns ± 3.3 ns per loop (mean ± std. dev. of 7 runs, 1000000 loops each) # <-- master In [6]: %timeit is_list_like(0) 271 ns ± ...
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39,853
BUG: array ufuncs with more than 2 inputs fails with 2 or more pd.Series and scalar arguments
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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 (note that this requires the gsw libr...
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CI: 3.8 numpy_dev build failing recently
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2021-02-16T22:58:37Z
2021-02-17T20:10:19Z
2021-02-17T20:10:19Z
CONTRIBUTOR
null
https://dev.azure.com/pandas-dev/pandas/_build/results?buildId=54353&view=logs&j=eab14f69-13b6-5db7-daeb-7b778629410b&t=ce687173-08c6-5301-838d-71b2dda24510 ``` 2021-02-16T22:44:34.3078267Z =================================== FAILURES =================================== 2021-02-16T22:44:34.3078772Z _______________...
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39,855
REF/POC: DTBlock/TDBlock backed directly by DTA/TDA
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2021-02-17T02:34:51Z
2021-02-17T03:04:59Z
2021-02-17T03:04:59Z
MEMBER
null
Remaining kludges in pytables and nanargminmax
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809,829,080
MDExOlB1bGxSZXF1ZXN0NTc0NjIyNTY1
39,856
CLN: assorted cleanups
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2021-02-17T03:51:45Z
2021-02-21T17:23:36Z
2021-02-21T17:16:21Z
MEMBER
null
- [ ] 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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809,862,249
MDU6SXNzdWU4MDk4NjIyNDk=
39,857
BUG: read_csv() does not read all the lines in a tsv file
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2021-02-17T05:17:30Z
2021-05-12T22:14:30Z
2021-05-12T22:14:30Z
NONE
null
**Code Sample, a copy-pastable example if possible** `snps_df = pd.read_csv('cast_chr7_snps.txt', sep='\t', header=None)` [cast_chr7_snps.txt](https://github.com/pandas-dev/pandas/files/5993376/cast_chr7_snps.txt) **Problem description** `pd.read_csv` doesn't read the entire file (30219 of the 30423 rows). I d...
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MDExOlB1bGxSZXF1ZXN0NTc0NjU5MTk4
39,858
DOC: Update matplotlib canonical
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2021-02-17T05:41:48Z
2021-02-17T20:10:54Z
2021-02-17T20:09:31Z
CONTRIBUTOR
null
Please see https://discourse.matplotlib.org/t/canonical-documentation-have-moved/21863
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39,859
DOC: add button to edit on GitHub
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2021-02-17T06:13:54Z
2021-08-21T14:48:32Z
null
MEMBER
null
#### Location of the documentation https://pandas.pydata.org/docs/ #### Documentation problem I'll write it as a user story: _As a pandas user, when I come across a small problem with the documentation (like a typo), I want to be able to suggest a fix with minimal friction._ Currently, contributors need ...
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39,860
BUG: read_json() converts non-existent fields in text 'NaN'
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2021-02-17T08:55:04Z
2021-02-17T14:38:37Z
2021-02-17T14:35:48Z
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. --- I am reading a big JSON file with json in lines: `pandas.read_json("big_file.js...
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809,996,244
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39,861
[POC] PERF: 1d version of the cython grouped aggregation algorithms
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2021-02-17T09:10:05Z
2021-04-26T08:19:54Z
2021-04-26T08:19:54Z
MEMBER
null
For now, this is just a small example to open discussion about how to tackle this topic (not meant for merging). Context: for a columnar dataframe (with ArrayManager), we would also perform the groupby operations column by column (instead of on the 2D blocks). Most of our custom cython aggregation algorithms are cur...
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39,862
BUG: Docs website is blocked by google safe browsing
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2021-02-17T10:10:15Z
2021-04-27T07:57:56Z
2021-04-27T07:57:56Z
NONE
null
I hope it's ok to skip the template as this is not a direct code bug but a website bug. Sorry for the german locales, but I guess the message is pretty clear anyways. The pandas docs are blocked by google safe browsing service. ![image](https://user-images.githubusercontent.com/3329124/108188866-64d49180-7110-11eb-...
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39,863
DOC: fixup link for lookup example
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2021-02-17T16:22:55Z
2021-02-18T10:46:35Z
2021-02-17T20:56:47Z
MEMBER
null
#### Location of the documentation https://pandas.pydata.org/pandas-docs/dev/reference/api/pandas.DataFrame.lookup.html?highlight=lookup#pandas.DataFrame.lookup #### Documentation problem It says > For an example see lookup() in the user guide. but the hyperlink doesn't send to the user guide #### S...
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MDExOlB1bGxSZXF1ZXN0NTc1MDY4MjMx
39,864
Update offsets.pyx
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2021-02-17T17:00:10Z
2021-02-17T17:13:07Z
2021-02-17T17:13:07Z
NONE
null
Fixes to year, quarter and month offsets. - [ ] 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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39,865
TYP: @final for Block methods
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2021-02-17T17:39:09Z
2021-02-21T17:23:00Z
2021-02-21T17:21:14Z
MEMBER
null
small optimization removing ndim kwarg from make_block_same_class
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Wrong date math
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2021-02-17T17:48:26Z
2021-02-28T13:07:13Z
2021-02-28T13:07:13Z
NONE
null
Explanation: ``` d = pd.Timestamp('2017-10-31T00:00:00+00:00') d -= pd.DateOffset(months=1) d += pd.DateOffset(months=1) assert d == pd.Timestamp('2017-10-31T00:00:00+00:00'), f"Date '{d}' is not as expected" ```
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[WIP] ENH: Groupby mode
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2021-02-17T17:57:51Z
2021-04-14T18:59:47Z
2021-04-14T18:59:47Z
MEMBER
null
- [x] closes #19254 - [ ] 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 Proof of concept for #19254 Is relatively fast compared to @rhshadrach method ``` I...
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CI: filter json DeprecationWarning
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2021-02-17T18:01:26Z
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MEMBER
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- [x] closes #39854 - [ ] 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 We're already using the same filter in two other places in this file.
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DOC: update link to user guide
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2021-02-17T18:29:39Z
2021-02-18T10:13:36Z
2021-02-17T20:56:47Z
CONTRIBUTOR
null
- [x] closes #39863
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Backport PR #39868 on branch 1.2.x (CI: filter json DeprecationWarning)
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2021-02-17T20:11:40Z
2021-02-18T09:42:50Z
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NONE
null
Backport PR #39868: CI: filter json DeprecationWarning
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Backport PR #39858 on branch 1.2.x (DOC: Update matplotlib canonical)
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2021-02-17T20:11:52Z
2021-02-18T09:38:40Z
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NONE
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Backport PR #39858: DOC: Update matplotlib canonical
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BUG: pandas.core.window.rolling.Rolling.std gives all-zero output for small numbers
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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. --- #### Code Sample, a copy-pastable example ```python import numpy as np import...
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TST/REF: collect Index tests by method
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BUG: pandas.SparseDtype from pandas.CategoricalDtype fails
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#### Code `Sample` ```python import numpy as np import pandas as pd from scipy import sparse as sp_sparse # Create categorical type and sparse type from it. custom_type = pd.CategoricalDtype(categories=['Zero', 'One']) categorical_sparse_type = pd.SparseDtype(dtype=custom_type, fill_value='Zero') # Create...
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39,875
Improvements to yearly, quarterly and monthly offsets
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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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39,876
TST: collect indexing tests by method
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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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Why .sort_values() on column containing same values shuffles entire dataframe ?
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``` df = pd.DataFrame({ 'col1': ['A', 'A', 'A', 'A', 'A', 'A']*15, 'col2': [1.0, 1.0, 1.0, 1.0, 1.0, 1.0]*15, 'col3': [0, 1, 9, 4, 2, 3]*15, 'col4': ['a', 'B', 'c', 'D', 'e', 'F']*15 }) df.sort_values('col2', ascending=True) ``` Why this operation disorders the entire dataframe ? The same wil...
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39,878
Cleaning yearly, quarterly and monthly date offsets
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2021-02-18T00:18:33Z
2021-06-16T13:27:04Z
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NONE
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- Ability to use `YearBegin` and `QuarterBegin` DateOffset classes as Period `freq`, along with offset aliases. - Ability to use three-letter month short names as `month` / `startingMonth` arguments of year- / quarter-based offset classes (as already used in their `_from_name` class method). - Expanded docstrings wit...
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Revert accidental commit
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TST: port Dim2CompatTests
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broken off from #38992
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BUG: `df.combine_first` duplicates rows for nan index values
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CONTRIBUTOR
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. (the issue sounds familiar, but I couldn't find it anywhere...) - [ ] (optional) I have confirmed this bug exists on the master branch of pandas. --- **Note**: P...
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BUG: InvalidIndexError: Reindexing only valid with uniquely valued Index objects on to_datetime
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#### Problem description I am expriencing a weird bug while trying to convert a list to datetime. Here is a bug repro: ```python import pandas as pd s = pd.Series([None, pd.NaT, pd.NaT, pd.NaT, pd.NaT, pd.NaT, pd.NaT, pd.NaT, pd.NaT, pd.NaT, pd.NaT, pd.NaT, pd.NaT, pd.NaT, pd.NaT, pd.NaT, pd.NaT, pd.NaT, pd.NaT, p...
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Backport PR #39869 on branch 1.2.x (DOC: update link to user guide)
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Backport PR #39869: DOC: update link to user guide
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CLN: remove redundant code related to Styler
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2021-02-19T06:11:37Z
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CONTRIBUTOR
null
`non_reducing_slice` is performed within the `apply` so no need to execute twice. `maybe_numeric_slice` is a convoluted wrapper for selecting numeric columns so removed.
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39,885
[ArrayManager] GroupBy cython aggregations (no fallback)
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2021-02-18T14:35:58Z
2021-02-25T17:49:00Z
2021-02-25T13:29:09Z
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xref https://github.com/pandas-dev/pandas/issues/39146/ This implements one aspect of groupby: basic cython-based aggregations (so not yet general apply, python fallback, or other methods, etc, only the basic aggregations that take the `_cython_agg_general` path). Similarly to how we currently have a `_cython_agg...
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39,886
correction to get time interpolation correct
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2021-02-18T15:24:43Z
2021-04-11T01:30:13Z
2021-04-11T01:30:13Z
NONE
null
- [ ] closes #21351 - [ ] One test does not pass and I don't know why
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39,887
BUG: Breaking change to offsets.pyx - MonthOffset
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2021-02-18T16:37:04Z
2021-08-17T00:29:22Z
2021-08-17T00:29:21Z
NONE
null
Add ability to use class `MonthBegin` as a period. It would address #38914 and #38859. - [ ] closes #38914 #38859 - [x] 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 - [x] whatsnew e...
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BUG: Relative luminance calc in Styler is wrong (and out of date)
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2021-02-18T16:46:55Z
2021-02-21T18:05:08Z
2021-02-21T18:05:08Z
CONTRIBUTOR
null
The relative luminance calculation is described here: https://www.w3.org/WAI/GL/wiki/Relative_luminance. RL is used by `Styler.background_gradient()` to determine text-color against background but the calculation is wrongly coded. In addition a new errata posted suggests that a scalar should be changed (albeit this ...
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39,889
BUG: Bg gradient map text color fix
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2021-02-18T16:50:29Z
2021-02-22T10:41:18Z
2021-02-21T18:05:08Z
CONTRIBUTOR
null
- [x] closes #39888
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39,890
BUG: Breaking change to offsets.pyx - quarter offset classes
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2021-02-18T17:07:42Z
2021-08-17T00:30:49Z
2021-08-17T00:30:49Z
NONE
null
Set default months for `BQuarterEnd`, `BQuarterBegin`, `QuarterEnd`, `QuarterBegin` classes in order; rename `startingMonth` parameter to `month` for those classes. Addresses #8435 and #5307 - [ ] closes #8435 #5307 - [x] tests added / passed - [x] Ensure all linting tests pass, see [here](https://pandas.pydata.o...
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TST/REF: share pytables dateutil/pytz tests
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2021-02-18T18:19:04Z
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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: de-duplicate block_shape vs safe_reshape
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2021-02-18T18:28:43Z
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REF: share fillna TDBlock/DTBlock
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Using 'openpyxl' engine to write in a Excel file - Handles Problem
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2021-02-18T20:34:13Z
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I am having issue putting the writer.save()/writer.close() handles in the right place. I have tried it like this but this wont put the pivot tables to the excel sheet. what can i do to fix this? ``` import openpyxl import pandas as pd import numpy as np from openpyxl.workbook import Workbook wb = openpyxl.load_...
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BUG: groupby dropna=False doesn't work for multi index columns
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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. --- #### Code Sample ```python In [1]: df = pd.DataFrame(dict(a=[nan], b=[0], c=[1])...
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BUG: Ignore_index on concat does not ignore index
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I have this line of code which works fine in pandas 1.1.5 but not in 1.2.2: `vintable = pd.concat([vintable, data], join='inner', ignore_index=True)` I expect this to concatenate the rows, inner-join the columns, and then reindex - which it used to do in December. But now I get this error: "Reindexing only valid...
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TYP: indexes/base.py
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2021-02-21T21:52:10Z
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CONTRIBUTOR
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Add types to `pandas/core/indexes/base.py`.
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BUG: dtype ignored in pd.read_excel
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I'm trying to read an excel file with pd.read_excel(). The excel file has 2 columns Date and Time and I want to read both columns as str not the excel dtype. Example of the excel file [test1.xlsx](https://github.com/pandas-dev/pandas/files/6006593/test1.xlsx) When using the dtype or the converters argument...
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REF: consolidate paths for astype
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TST: unnecessary check_stacklevel=False
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BUG: Inconsistency in df.sum when strings are present in column values
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BUG: DataFrame construction with columns argument set to a MultiIndex creates an empty DataFrame.
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2021-02-19T10:19:36Z
2021-04-01T07:15:40Z
2021-04-01T07:15:11Z
MEMBER
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. - [x] (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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DOC: Google Chrome flags documentation pages as dangeorus
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2021-02-19T10:55:25Z
2021-02-20T11:48:24Z
2021-02-19T11:11:51Z
NONE
null
#### Location of the documentation If you go to https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.DataFrame.drop.html with a current Google Chrome (Version 88.0.4324.150 (Official Build) (64-bit), Linux), you get this red page ![dangerous](https://user-images.githubusercontent.com/113313/108495010...
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811,932,640
MDU6SXNzdWU4MTE5MzI2NDA=
39,906
BUG: pd.read_csv ignores columns with only zeros
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2021-02-19T11:11:08Z
2021-02-28T12:57:11Z
2021-02-28T12:57:11Z
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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MDU6SXNzdWU4MTIwMzIxNTc=
39,907
BUG: wrong type hint for pandas.Series.droplevel
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2021-02-19T13:39:51Z
2021-02-20T18:16:14Z
2021-02-20T18:16:14Z
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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[ArrowStringArray] API: StringDtype parameterized by storage (python or pyarrow)
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39
2021-02-19T14:03:54Z
2021-06-08T14:25:20Z
2021-06-08T13:36:42Z
MEMBER
null
continuation of #36142 todo: - [x] during the merge I removed the import gymnastics from `pandas/core/arrays/string_arrow.py`. We added since `ArrowStringDtype` should always be available. I think this is no longer the case and we want to move the import checks to `StringDtype`. I expect envs without pyarrow to f...
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Pandas site marked as dangerous by Chrome
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2021-02-19T14:10:30Z
2021-02-19T14:12:33Z
2021-02-19T14:12:22Z
NONE
null
Not sure if this is the right repo to report this, but Chrome browser is now displaying a scary red warning when I try to visit Pandas docs on https://pandas.pydata.org/. ![image](https://user-images.githubusercontent.com/42127323/108514983-536fbe80-72a3-11eb-8a8a-49d075e4c49d.png) Chrome version is 88.0.4324.182...
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The site ahead may contain harmful programs on doc website DOC:
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2021-02-19T14:17:16Z
2021-02-19T14:19:38Z
2021-02-19T14:19:38Z
CONTRIBUTOR
null
#### The site ahead may contain harmful programs https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.concat.html <img width="1439" alt="Screen Shot 2021-02-19 at 7 08 58 AM" src="https://user-images.githubusercontent.com/232564/108515589-7b025f00-7282-11eb-93e3-ad844d272c5a.png">
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BUG: DataFrame does not display as LaTeX in Jupyter when it should
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2021-02-19T14:49:11Z
2021-10-26T18:39:05Z
null
CONTRIBUTOR
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. --- If you run the following in a Jupyter cell: ```python import pandas as pd ...
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39,912
BUG: pd.io.sql.get_schema function converts/Shows boolean Data types as a int Datatype
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2021-02-19T15:08:58Z
2021-02-20T04:18:47Z
2021-02-20T04:16:09Z
NONE
null
- [x] 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. --- #### Output of ``pd.show_versions()`` <details> INSTALLED VERSIONS --------...
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39,913
ENH: new orient setting for read_json to support common API format
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2021-02-19T17:28:42Z
2021-07-11T18:05:34Z
null
NONE
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#### Is your feature request related to a problem? I see many APIs return results in the form: ```json { "results": [ {"a" :1, "b":2 }, { "a" :3, "b":4 } ] } ``` This format isn't directly supported by pandas. The data is in the "records" orient, but there is an extra...
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812,209,750
MDU6SXNzdWU4MTIyMDk3NTA=
39,914
ENH: Multi-layered Vector Functions
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11
2021-02-19T17:39:36Z
2021-08-15T18:42:15Z
2021-08-15T18:42:14Z
NONE
null
#### Add multi-layered vector support When working on a large panadas dataframe, I tried to use the iloc method on the dataframe with a list of lists index query. I thought that the behavior of iloc with a 1d array would be extended to 2d arrays, and it would return a 2d array of the query results. This would allow fo...
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https://api.github.com/repos/pandas-dev/pandas/issues/39915
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812,225,525
MDU6SXNzdWU4MTIyMjU1MjU=
39,915
ENH: `df.explode` should turn empty lists into *no* rows rather than a NaN row
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7
2021-02-19T18:04:54Z
2021-08-15T18:42:58Z
null
NONE
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#### Is your feature request related to a problem? When using `df.explode`, I'd expect that a list-like `L` gets transformed into `len(L)` rows and a scalar into 1 row. While documented, the current behavior of turning empty list-likes into 1 row containing NaN instead of 0 rows is counterintuitive. #### Describe...
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https://api.github.com/repos/pandas-dev/pandas/issues/39916
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812,298,537
MDExOlB1bGxSZXF1ZXN0NTc2Njg2MDcy
39,916
ENH: Implement unary operators for FloatingArray class
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7
2021-02-19T20:02:42Z
2021-02-28T15:59:21Z
2021-02-28T08:38:16Z
CONTRIBUTOR
null
- [ ] closes #38749 - [ ] 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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812,306,370
MDExOlB1bGxSZXF1ZXN0NTc2NjkyOTI0
39,917
BENCH: collect low-dependency asvs
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2
2021-02-19T20:12:35Z
2021-03-01T15:46:49Z
2021-03-01T13:56:08Z
MEMBER
null
The idea here is to collect benchmarks in such a way that we can say "This PR doesn't change code in files [...] -> We can skip running asvs in files [...]". (putting together a POC script to automate a bit of this) There is a cost to refactoring benchmarks, since we have to re-run the new benchmarks on older commi...
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812,328,615
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39,918
QST: The site ahead contains harmful programs
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4
2021-02-19T20:35:32Z
2021-02-19T21:59:02Z
2021-02-19T21:58:44Z
CONTRIBUTOR
null
I am getting "site contains harmful programs' error here: https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.DataFrame.apply.html https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.Series.apply.html > The site ahead contains harmful programs > Attackers on pandas.pydata.org migh...
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