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https://api.github.com/repos/pandas-dev/pandas/issues/27413
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468,437,436
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27,413
CLN/REF: Unify Arithmetic Methods
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2019-07-16T04:10:14Z
2019-07-20T20:08:01Z
2019-07-20T20:06:05Z
MEMBER
null
2 goals here. First is to end up with a single implementation for our arithmetic ops. By implementing the missing methods directly on DTA/PA, we make it so we don't need to special-case inside the `Index.__foo__` methods, so can dispatch to Series more directly. Second is to get the wrapper defined in_arith_meth...
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MDU6SXNzdWU0Njg1MjQ4NjA=
27,414
read_csv memory leak
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2019-07-16T08:44:51Z
2020-01-21T04:15:08Z
2020-01-21T04:15:08Z
NONE
null
#### Code Sample, a copy-pastable example if possible ```python import sys import pandas as pd _dir = r'D:\Python\data' file_name = pd.read_csv(_dir + r'\dblist.csv', index_col=0) file_name.loc[:, 'code'] = [x.upper() for x in file_name['code']] file_name.loc[:, 'name'] = [x.upper() for x in file_name['name']]...
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468,568,163
MDU6SXNzdWU0Njg1NjgxNjM=
27,415
Using a `CategoricalIndex` with interval categories as column index breaks operations on a `DataFrame`
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2019-07-16T10:13:16Z
2019-07-23T22:06:16Z
2019-07-23T22:06:16Z
NONE
null
#### Code Sample, a copy-pastable example if possible ```python >>> a = pd.DataFrame([[1, 2]], columns=pd.CategoricalIndex(pd.interval_range(start=0.0, end=2.0))) >>> a.T * 100 0 (0.0, 1.0] 100 (1.0, 2.0] 200 >>> a * 100 -------------------------------------------------------------------...
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MDExOlB1bGxSZXF1ZXN0Mjk4MDE2MjY0
27,416
CI: limit pytest version on 3.6
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2019-07-16T12:25:23Z
2019-07-16T19:19:30Z
2019-07-16T19:19:30Z
CONTRIBUTOR
null
closes #27406
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468,703,014
MDU6SXNzdWU0Njg3MDMwMTQ=
27,417
PERF: maybe_convert_objects rethink.
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2019-07-16T14:54:35Z
2019-07-27T14:24:27Z
2019-07-27T14:24:26Z
CONTRIBUTOR
null
While exploring the `maybe_convert_objects` I've got quite a few proposals/questions but in the end I've come to a conclusion that the logic of function itself is far from optimal. #### Motivation 1. Main argument here is we are not checking for inconsistency of parts of already seen data. E.g. if we have seen `dat...
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468,730,217
MDExOlB1bGxSZXF1ZXN0Mjk4MTAyOTA2
27,418
add some type annotations io/formats/format.py
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2019-07-16T15:43:54Z
2019-07-22T11:48:22Z
2019-07-21T01:06:45Z
MEMBER
null
typing not added to all function signatures in io/formats/format.py in this pass to reduce the diff ~~this PR also contains a refactor to simplify the addition of type annotations; `truncate_h` and `tr_col_num` are dependant variables. `truncate_h` can be `True` or `False`. if `True`, `tr_col_num` is an `int` else i...
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MDU6SXNzdWU0Njg3NjY4MTI=
27,419
fillna is broken for Datetime columns [regression]
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2019-07-16T17:05:26Z
2019-07-17T11:54:25Z
2019-07-17T11:54:25Z
CONTRIBUTOR
null
In 823af7639b94a39609c06a2228ba9e0f31155724 a call to `block._try_coerce_args()` was incorrectly replaced with call to `block._can_hold_element()` (I think under assumption that all block types have identical implementations of `_try_coerce_args` which is not true). For Datetime blocks this leads to blowing up with ...
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27,420
DataFrame with MultiIndex raises `TypeError` instead of `KeyError` for inexistent keys
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2019-07-16T17:46:28Z
2020-10-20T02:08:29Z
2020-10-20T02:08:29Z
NONE
null
#### Code Sample, a copy-pastable example if possible ```python import pandas as pd a = {'A': [1, 2, 3, 4], 'B': [5, 6, 7, 8], 'C': [9, 10, 11, 12]} df = pd.DataFrame.from_records(a, index=['A', 'B']) df.loc[(1,6)] ``` #### Problem description When a non existent key `.loc` raises `TypeError`. Is this...
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27,421
CI: Compatibility with pytest-azurepipelines
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2019-07-16T18:08:04Z
2020-10-09T18:26:47Z
2020-10-09T18:26:47Z
CONTRIBUTOR
null
https://github.com/pandas-dev/pandas/pull/27416#issuecomment-511922995 Failing on the prerelease at https://pypi.org/project/pytest-azurepipelines/1.0.0a1/
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27,422
BUG: to_datetime with multiple timezones does not coerce if invalid string in input
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2019-07-16T19:39:59Z
2019-07-16T22:55:20Z
2019-07-16T21:21:49Z
NONE
null
#### Code Sample ```python import pandas as pd se = pd.Series(["2019-01-01 03:00:00-0500", "abc", "2019-01-01 03:00:00-0100"]) assert type(pd.to_datetime(se, errors="coerce").iloc[0]) == str ``` Note that the type of the first element (`"2019-01-01 03:00:00-0500"`) is `str` *after* the "conversion". ```p...
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468,849,109
MDExOlB1bGxSZXF1ZXN0Mjk4MTk5MjI2
27,423
CLN: fix build warning in c_timestamp.pyx
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2019-07-16T20:30:10Z
2019-07-20T21:39:05Z
2019-07-20T20:36:14Z
NONE
null
``` pandas/_libs/tslibs/c_timestamp.c: In function ‘__pyx_f_6pandas_5_libs_6tslibs_11c_timestamp_10_Timestamp__get_start_end_field’: pandas/_libs/tslibs/c_timestamp.c:7257:25: warning: ‘__pyx_t_10’ may be used uninitialized in this function [-Wmaybe-uninitialized] 7257 | __pyx_t_5numpy_int8_t __pyx_t_10[1]; ...
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468,850,297
MDExOlB1bGxSZXF1ZXN0Mjk4MjAwMTg5
27,424
Removed ABCs from pandas._typing
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9
2019-07-16T20:33:16Z
2019-07-24T16:43:05Z
2019-07-24T16:42:51Z
MEMBER
null
- [X] closes #27146 - [ ] tests added / passed - [ ] passes `black pandas` - [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff` - [ ] whatsnew entry This reveals a few new typing issues so won't pass CI but submitting as draft Here's one way I think that works to avoid import cycles. Basically...
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468,855,307
MDExOlB1bGxSZXF1ZXN0Mjk4MjA0MjU0
27,425
BUG: fix+test fillna with non-nano datetime64; closes #27419
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2019-07-16T20:45:28Z
2019-07-17T14:05:18Z
2019-07-17T11:54:25Z
MEMBER
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- [x] closes #27419 - [x] tests added / passed - [x] passes `black pandas` - [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff` - [ ] whatsnew entry
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468,883,453
MDExOlB1bGxSZXF1ZXN0Mjk4MjI3MjI4
27,426
Reallow usecols to reference OOB indices - reverts 25623
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2019-07-16T21:58:23Z
2020-01-16T00:35:03Z
2019-07-17T11:52:36Z
MEMBER
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- [x] closes #27252 reverts #25623 @heckeop @gfyoung I know you asked for a FutureWarning to be raised but I didn't want to mess around with the validation_function in place here so just did a simple revert for sake of time / effort
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468,911,318
MDExOlB1bGxSZXF1ZXN0Mjk4MjQ5OTYy
27,427
Merged mypy.ini into setup.cfg
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2019-07-16T23:14:53Z
2019-10-11T03:40:07Z
2019-07-17T11:45:08Z
MEMBER
null
Figure the mypy.ini is small enough now don't need a dedicated config file for it
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468,928,172
MDExOlB1bGxSZXF1ZXN0Mjk4MjYxOTI5
27,428
CLN/REF: stop allowing iNaT in DatetimeBlock
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2019-07-17T00:21:26Z
2019-07-24T00:23:23Z
2019-07-23T23:55:40Z
MEMBER
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Sits on top of #27411 xref #16674. The broader goal is de-special-casing code in internals.
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469,033,129
MDU6SXNzdWU0NjkwMzMxMjk=
27,429
cannot join on column with datetime when using the 'on' parameter
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2019-07-17T07:31:20Z
2019-07-17T18:14:09Z
2019-07-17T17:55:57Z
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#### Code Sample, a copy-pastable example if possible ```python import pandas as pd left = pd.DataFrame({'date':['2019-01-01'], 'a': [1]}) left['date'] = pd.to_datetime(left['date'], utc=True) right = pd.DataFrame({'date':['2019-01-01'], 'b': [1]}) right['date'] = pd.to_datetime(right['date'], utc=True) ...
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MDU6SXNzdWU0NjkxMjE4ODk=
27,430
validate ='m:m' in dataframe.merge should have a meaningful purpose
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2019-07-17T10:47:50Z
2021-07-10T18:21:30Z
2021-07-10T18:21:29Z
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#### Code Sample, a copy-pastable example if possible Currently, in https://github.com/pandas-dev/pandas/blob/master/pandas/core/reshape/merge.py ```python elif validate in ["many_to_many", "m:m"]: pass ``` #### Problem description I was expecting m:m to give me a warning/error if either the left...
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MDU6SXNzdWU0NjkyNDc1MzU=
27,431
Feature request: add option to disable columns.levels autosorting
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2019-07-17T14:25:16Z
2021-07-10T18:23:32Z
2021-07-10T18:23:32Z
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I am trying to develop general code to access specific columns in the order they are displayed by index. However, columns.levels resorts alphabetically automatically, and doesn't seem to have an option to have it... not do that. It would be useful if there was an option to have it remember the original order, to allo...
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PLT: Delegating to plotting backend only plots of Series and DataFrame methods
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- [X] xref #26747 - [ ] tests added / passed - [x] passes `black pandas` - [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff` - [ ] whatsnew entry
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df.describe.min(), max(), count() etc. produce results inconsistent with describe
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2019-07-17T16:16:25Z
2019-07-17T16:22:33Z
2019-07-17T16:22:33Z
NONE
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#### Code Sample, a copy-pastable example if possible ```python import pandas as pd df = pd.DataFrame({'data': []}) print (df.describe()) print ('Dataframe mean: {}'.format(df['data'].describe().mean())) print ('Dataframe min: {}'.format(df['data'].describe().min())) print ('Dataframe count: {}'.format(d...
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Connecting to Kaggle for data.
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2019-07-17T16:57:54Z
2019-08-01T03:34:26Z
2019-07-17T17:00:24Z
NONE
null
#### Code Sample, a copy-pastable example if possible ```python project_data = pd.read_csv('https://www.kaggle.com/hanselhansel/donorschoose#train_data.csv') resource_data = pd.read_csv('https://www.kaggle.com/hanselhansel/donorschoose#Resources.csv') ``` #### Problem description Anyone one knows if I am p...
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27,435
Cannot install pandas 0.24.2 from source with Python 2.7 into an environment without NumPy
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2019-07-17T18:09:20Z
2020-04-03T14:57:32Z
2019-10-22T01:24:43Z
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#### Code Sample, a copy-pastable example if possible ```bash RuntimeError: Python version >= 3.5 required. ``` #### Problem description Under this docs: https://pandas.pydata.org/pandas-docs/stable/whatsnew/v0.24.0.html 0.24.x is supposed to be backward compatible to Python 2. ``` The 0.24.x series of ...
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BUG: fix+test quantile with empty DataFrame, closes #23925
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2019-07-17T18:17:01Z
2019-07-24T13:20:10Z
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- [x] closes #23925 - [x] tests added / passed - [x] passes `black pandas` - [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff` - [ ] whatsnew entry
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Indexing on series where index is output from pd.cut
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2019-07-17T18:24:13Z
2021-09-20T18:27:19Z
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#### Code Sample, a copy-pastable example if possible ```python import pandas as pd data = pd.DataFrame(dict(values=range(20), quintiles=pd.cut(range(20), 5))) grouped = data.groupby("quintiles")["values"] samples = grouped.agg(lambda x: list(x.sample(3))) samples # quintiles # (-0.019, 3.8] [3, 2, ...
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BUG: maybe_convert_objects mixed datetimes and timedeltas
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2019-07-17T18:47:51Z
2019-07-25T19:56:41Z
2019-07-24T12:05:48Z
CONTRIBUTOR
null
- [X] corresponding [discussion](https://github.com/pandas-dev/pandas/issues/27417#issuecomment-512014358) 27417 - [X] tests added / passed - [X] passes `black pandas` - [X] passes `git diff upstream/master -u -- "*.py" | flake8 --diff` - [ ] whatsnew entry In order to stick to `maybe_convert_objects` realizatio...
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27,439
[Feature request] Add a "filter" method to Index and Series
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2019-07-17T20:18:34Z
2021-07-10T18:29:57Z
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#### Code Sample, a copy-pastable example if possible ```python # Function def _filter(self, func): return self[list(map(func, self))] # Set the attribute setattr(pd.Index, "filter", _filter) index = pd.Index(["iris_1", "notiris_1", "iris_2", "other_thing"]) # New way func = lambda x:x.startswith("...
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27,440
CLN: Trim unused/unnecessary code
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27,441
Add 'key' keyword argument to max/min methods, akin to python's builtin max/min
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2019-07-17T22:48:56Z
2019-07-17T23:08:14Z
2019-07-17T23:08:14Z
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See https://docs.python.org/3/library/functions.html#max Specifying a `key=` function F to use indicates you want to return the `val` with the largest `F(val)`, as opposed to returning the largest val or returning the largest F(val). The following code should work: ``` >>> pd.DataFrame([1, 3, 5, 7]).max(key=l...
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469,492,865
MDU6SXNzdWU0Njk0OTI4NjU=
27,442
Give pandas.core.groupby.generic.DataFrameGroupBy __str__/_repr_pretty_/__repr__ methods
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5
2019-07-17T23:13:12Z
2021-07-10T18:30:33Z
null
NONE
null
Current behavior: ``` >>> df = pd.DataFrame({'a': [1, 1, 3], 'b': [9, 8, 7]}) >>> df.groupby('a') <pandas.core.groupby.generic.DataFrameGroupBy object at 0x7fd3d5a7b470> ``` Desired behavior ...
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469,530,530
MDExOlB1bGxSZXF1ZXN0Mjk4NzI2ODM2
27,443
TST: Add test for operations on DataFrame with Interval CategoricalIndex
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2
2019-07-18T01:43:53Z
2019-07-23T22:06:19Z
2019-07-23T22:06:16Z
CONTRIBUTOR
null
- [x] closes #27415 - [x] tests added / passed - [x] passes `black pandas` - [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff` - [ ] whatsnew entry
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469,544,767
MDExOlB1bGxSZXF1ZXN0Mjk4NzM2MjYy
27,444
CLN: simplify maybe_convert_objects, soft_convert_objects
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2
2019-07-18T02:46:26Z
2019-07-20T23:52:50Z
2019-07-20T23:49:48Z
MEMBER
null
Block.replace has code for dispatching to either maybe_convert_objects or soft_convert_objects, but the former is only reached from the tests. So rip that out and use soft_convert_objects. Both of the functions have branches that are unreachable, so rip those out, along with adding types and validation.
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469,545,970
MDExOlB1bGxSZXF1ZXN0Mjk4NzM3MTcz
27,445
BUG: avoid incorrectly inheriting result
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5
2019-07-18T02:51:43Z
2019-07-26T17:21:17Z
2019-07-26T17:21:05Z
MEMBER
null
This has caused problems in a number of local branches, but I don't have a good test case on master. Suggestions welcome. Still though, the failure mode is pretty clear, so this fixes it.
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469,566,261
MDU6SXNzdWU0Njk1NjYyNjE=
27,446
Is the internal twosigma refactor of window.pyx planned for merging in pandas?
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2019-07-18T04:35:00Z
2019-07-19T03:43:07Z
2019-07-18T19:57:57Z
NONE
null
I've been thinking of improvements to pandas rolling window functionality. Namely, allowing users to supply their own indexers and allowing numba JIT'd kernels to be passed to apply/transform. I [floated](](https://github.com/pandas-dev/pandas/pull/27403#discussion_r304165649)) the idea of a window.pyx refactor, and...
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MDExOlB1bGxSZXF1ZXN0Mjk4NzU2NjY1
27,447
WIP: treat list of namedtuples like list of dict in DataFrame()
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2019-07-18T05:03:33Z
2019-07-20T18:40:49Z
2019-07-20T18:31:37Z
NONE
null
Retrying in a new PR.
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469,595,251
MDExOlB1bGxSZXF1ZXN0Mjk4Nzc0Mjg3
27,448
PERF: restore performance for unsorted CategoricalDtype comparison
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1
2019-07-18T06:39:11Z
2019-07-18T10:53:56Z
2019-07-18T10:53:29Z
CONTRIBUTOR
null
Fixes a performance regression introduced in #26403 very shortly before `0.25.0rc0` was cut, which can be seen [here](https://qwhelan.github.io/pandas/#indexing.CategoricalIndexIndexing.time_getitem_slice?machine=T470&num_cpu=4&os=Linux%205.0.0-20-generic&ram=20305904) ![Screenshot from 2019-07-17 23-29-08](https://us...
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469,661,011
MDU6SXNzdWU0Njk2NjEwMTE=
27,449
Usage of .loc with output of drop_dupilcates() returned DatetimeIndex
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2019-07-18T09:21:13Z
2019-07-18T09:26:36Z
2019-07-18T09:26:11Z
NONE
null
Basically I want to get rid of duplicated DatetimeIndex items. I do not understand why this does not work using the output of "drop_duplicates()". I am using pandas 0.24.2 This shows that drop_duplicates() in the loc statement does not work although it does work with the boolean approach. ```python import p...
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27,450
Why read_sas is converting strings to float?
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2019-07-18T10:15:02Z
2019-07-23T18:16:20Z
2019-07-23T16:48:34Z
NONE
null
#### Code Sample ```python import pandas as pd df = pd.read_sas('test.sas7bdat', format='sas7bdat', encoding='utf-8') ``` #### Problem description I am trying to read a `.sas7bdat` file using `read_sas` and I am having a hard time because the module is converting strings values that look like a number into `f...
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27,451
`Dataframe.sample()` isn't validating `frac`
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2019-07-18T10:55:17Z
2019-11-08T01:03:24Z
2019-11-08T01:03:24Z
NONE
null
Minor/trivial bug: https://github.com/pandas-dev/pandas/blob/master/pandas/core/generic.py#L4960 Shouldn't `sample()` check that `frac` is between 0 and 1 somewhere? Doc improvement suggestion: Could anyone confirm that `replace=True|False` means allowing|disallowing sampling the same row more than once? ...
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469,707,237
MDU6SXNzdWU0Njk3MDcyMzc=
27,452
.merge() does not preserve the row-order at the output dataframe
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2019-07-18T11:05:24Z
2019-07-18T11:15:32Z
2019-07-18T11:15:08Z
NONE
null
Have a look here: https://stackoverflow.com/q/57092373/9024698
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469,710,225
MDU6SXNzdWU0Njk3MTAyMjU=
27,453
Right merge not preserve order
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2019-07-18T11:12:41Z
2020-03-26T12:45:38Z
2020-03-26T12:45:38Z
NONE
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Base by [SO question](https://stackoverflow.com/q/57092373/2901002): Merge with right join not preserve order of columns: columns = ['A', 'B', 'C'] data_1 = [[2, 5, 3, 5], [8, 2, 4, 1], [6, 5, 9, 1]] data_1 = np.array(data_1).T df_1 = pd.DataFrame(data=data_1, columns=columns) print (df_1)...
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469,738,644
MDU6SXNzdWU0Njk3Mzg2NDQ=
27,454
pd.to_datetime() flaw mixed behavior yielding inconsistant results
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1
2019-07-18T12:21:11Z
2019-07-18T16:55:53Z
2019-07-18T16:55:48Z
NONE
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#### Code Sample, a copy-pastable example if possible ```python import pandas as pd str1='05-01-2019 00:37' date1=pd.to_datetime(str1).date() print(date1) # output 2019-05-01 str2='15-01-2019 00:37' date2=pd.to_datetime(str2).date() print(date2) # output 2019-01-15 ``` #### Problem descript...
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27,455
Pinned date and fixed contributors directive
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2019-07-18T15:07:13Z
2019-07-18T15:56:41Z
2019-07-18T15:56:36Z
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@TomAugspurger
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27,456
issues with overlapping multi index intervals
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13
2019-07-18T16:33:22Z
2020-04-27T00:16:45Z
null
NONE
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Scenario 1: single-level indexing, which works fine: import pandas as pd # pandas version 0.25.0, python version: 3.6.6 idx = pd.IntervalIndex.from_arrays([1,3,1,2], [3,4,2,4]) df = pd.DataFrame({'Value':[1,2,3,4]},index=idx) which returns: df = ...
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27,457
missing.cpython-35m-x86_64
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5
2019-07-18T17:47:32Z
2019-07-23T17:16:33Z
2019-07-22T17:46:56Z
NONE
null
Every once in a while, one of my scripts are failing and initially I thought it was due to a memory leak somewhere. After reading the error carefully, it looks like it's from a missing dependency: ``` 7fecaeb6d000-7fecaeb7f000 r-xp 00000000 08:04 3021138 /home/lib/python3.5/site-packages/pandas/_...
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27,458
Feature Request: Binomial Standard Deviation?
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2019-07-18T18:56:07Z
2019-07-19T00:06:51Z
2019-07-18T23:28:41Z
NONE
null
#### Problem description We often work with large quantities of simulated data, and it would be convenient if we could get binomial standard deviation with a `.binom_std()` method (or with an optional argument to `.std()`.
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27,459
Fix #27451 (doc + validation)
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2019-07-18T19:59:28Z
2019-09-05T17:50:27Z
2019-09-05T17:50:27Z
NONE
null
- [X ] closes #27451 - [ X] tests added / passed - [ ] passes `black pandas` - [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff` - [ ] whatsnew entry
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27,460
REF: share code between pd.array and Series constructor
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2019-07-18T23:25:25Z
2019-07-23T19:38:12Z
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MEMBER
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I've noticed a couple of places in the code where we do runtime imports of Series just to do `values = Series(values)._values`. It would be nice to avoid that. This probably also means moving parts of internals.construction to somewhere like `arrays.array_`. In particular I think this would require moving sanitize...
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27,461
CLN: avoid runtime imports
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2019-07-19T00:57:27Z
2019-07-22T14:08:08Z
2019-07-22T11:52:32Z
MEMBER
null
Edits to lib.is_scalar are to put slower python-space checks later so they may get short-circuited. Everything else should be self-explanatory.
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27,462
ENH: allow EA to register types for is_scalar
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2019-07-19T01:17:32Z
2021-07-10T18:32:41Z
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null
https://github.com/pandas-dev/pandas/pull/27461#discussion_r305168936 > i think we need. way for EA to hook into this for an EA scalar > eg an IPaddress from cyberpandas could register a scalar i think Before we move on this, I think we need to clarify in which situations we care about `lib.is_scalar(x)` vs the ...
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27,463
Remove .. versionadded:: 0.18
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4
2019-07-19T01:50:26Z
2019-07-20T20:26:12Z
2019-07-20T19:20:06Z
CONTRIBUTOR
null
Removed ``.. versionadded:: 0.18.0`` and related text blocks.
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27,464
Bug in DataFrame.rfloordiv when alignment for different columns and index.
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1
2019-07-19T03:19:10Z
2019-08-20T17:45:06Z
2019-08-20T17:45:06Z
CONTRIBUTOR
null
I think that `.loc[0, 'A']` should be inf. ```python In [36]: a = pd.DataFrame({"A": [0, 1, 2], 'B': [1.1, None, 1.1]}) In [37]: b = pd.DataFrame({"A": [1.1, 1.2, 1.3]}, index=[0, 2, 3]) In [38]: a.rfloordiv(b, fill_value=1) Out[38]: A B 0 NaN 0.0 1 1.0 NaN 2 0.0 0.0 3 1.0 NaN ``` to...
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27,465
CLN: remove unused parts of skiplist (most of it)
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17
2019-07-19T04:13:50Z
2019-09-11T15:36:20Z
2019-09-11T02:02:07Z
MEMBER
null
As a follow-up I'll take a look at either removing the now-empty .pyx file or trying to port the c file to pyx
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CLN: remove unused row_bool_subset
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6
2019-07-19T04:29:29Z
2020-04-05T17:36:18Z
2019-07-20T19:29:22Z
MEMBER
null
@jreback can you confirm my hunch that the `result.ndim == 2` block in groupby.ops was for Panel? Tracing back the blame, row_bool_subset was introduced [here](https://github.com/pandas-dev/pandas/commit/b15ae85e1f647821755d35bedd6143ad1e9c3678) in 2012 to close #152 and it started being called only for result.ndim ...
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Groupby transform cleanups
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6
2019-07-19T04:31:40Z
2019-07-25T23:45:09Z
2019-07-25T22:09:45Z
NONE
null
- [x] whatsnew Related #27389 (several issues there) closes #27486
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BUG: Groupby.transform('ngroup') fails
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2019-07-19T05:53:17Z
2019-07-22T21:13:33Z
null
NONE
null
Adding tests for #27467 surfaced some bugs: ```python from pandas import * df = DataFrame(dict(a=[0, 0, 0, 1, 1, 1], b=range(6))) g = df.groupby(np.repeat([0,1], 3)) # ok print(g.ngroup()) #fails g.transform('ngroup') AttributeError: ("'Series' object has no attribute 'ngroup'", 'occurred at index a') `...
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BUG: Groupby.transform('size') fails for multicolumn frame
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2019-07-19T05:54:53Z
2019-07-23T15:02:19Z
null
NONE
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Adding tests for #27467 surfaced some bugs: ```python from pandas import * df = DataFrame(dict(a=[0, 0, 0, 1, 1, 1], b=range(6))) g = df.groupby(np.repeat([0,1], 3)) # ok print(g.size()) #fails g.transform('size') TypeError: Transform function invalid for data types ```
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BUG: Groupby.quantile segfaults for quantile > 1
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2019-07-19T05:58:13Z
2019-08-12T17:56:47Z
2019-08-12T17:56:47Z
NONE
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Adding tests for #27467 surfaced some bugs: ```python from pandas import * df = DataFrame(dict(a=[0, 0, 0, 1, 1, 1], b=range(6))) g = df.groupby(np.repeat([0,1], 3)) # ok g.quantile(50) <segfault> ``` quantile accepts floats in `[0,1]` or arrays of floats. It appears not to validate the range though.
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27,471
missing pandas.core.config in v0.25
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2019-07-19T06:07:29Z
2019-07-22T16:11:46Z
2019-07-19T06:25:41Z
NONE
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### Problem description I need a print table with several columns by default for automatic test purposes while the default number of columns changed from version v0.23. I was using a simple check ```python if 'display.max_columns' in pandas.core.config._registered_options: pandas.set_option('display.max_colum...
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BUG: Groupby.transform('cumcount') fails
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6
2019-07-19T06:10:48Z
2021-07-22T18:05:00Z
2021-07-22T18:05:00Z
NONE
null
Adding tests for #27467 surfaced some bugs: ```python from pandas import * df = DataFrame(dict(a=[0, 0, 0, 1, 1, 1], b=range(6))) g = df.groupby(np.repeat([0,1], 3)) # ok g.cumcount() # fails g.transform('cumcount') AttributeError: ("'Series' object has no attribute 'cumcount'", 'occurred at index a') ``` ...
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27,473
BUG: quantile segfaults on invalid quantile values
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2019-07-19T06:39:46Z
2019-08-07T16:29:08Z
2019-07-31T14:18:01Z
NONE
null
- [x] closes #27470 - [ ] waiting for #27584 to be resolved (move `check_percentiles` out of `NDFrame`) - [ ] waiting for #27526 to be resolved (#20405 cythonized `Groupby.quantile` with functionality regression) - [ ] whatsnew entry
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DOC: Fix typos in docstrings for functions referring.
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2019-07-19T09:09:50Z
2019-07-19T11:55:20Z
2019-07-19T11:55:20Z
CONTRIBUTOR
null
Fixed two typos in docstrings for functions referring.
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MDExOlB1bGxSZXF1ZXN0Mjk5MjUyNTE5
27,475
Make a fastpath conditional on `data is None`
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2019-07-19T09:18:25Z
2019-07-19T09:52:13Z
2019-07-19T09:52:13Z
NONE
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As per the pre-existing comment in the code: this is a fastpath for the case `data is None`. Better include an if-statement to make sure this condition actually holds. When this if-statement is not present, failure occurs at a later point in the code when an empty index is used, because that later code expects da...
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27,476
BUG: Missing documentation for read_spss()
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4
2019-07-19T13:30:37Z
2019-08-12T21:16:39Z
2019-07-26T20:58:46Z
CONTRIBUTOR
null
#### Problem description New added feature read_spss() #26537 doesn´t still have any kind of documentation about it http://pandas-docs.github.io/pandas-docs-travis/user_guide/io.html
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27,477
Run a User Survey
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2019-07-19T15:03:53Z
2019-08-08T19:28:51Z
2019-08-08T16:14:32Z
CONTRIBUTOR
null
It'd be nice to run a survey to better understand what our users want from the library. We can ask things like * What version of pandas are you using? * Is pandas stable enough? * What APIs are you using (e.g. which `read_` methods)? * What features would you like (additional readers, etc.)? I plan to put ...
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27,478
Add a Roadmap
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2019-07-19T15:10:58Z
2019-08-01T20:50:46Z
2019-08-01T18:04:12Z
CONTRIBUTOR
null
This PR adds a roadmap document. This is useful when pursing funding; we can point to a list of known items that we'd like to do if we had the person time (and funding) to tackle them. Let's have two discussions 1. Do we want this? Roadmaps tend to go stale. How can we keep this up to date? 2. If so, what items ...
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27,479
deregister_matplotlib_converters() in 0.25 incorrectly removes Matplotlib converters
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2019-07-19T16:01:42Z
2019-08-20T14:26:50Z
2019-08-20T14:26:49Z
CONTRIBUTOR
null
Consider ```python import matplotlib.units as munits import pandas as pd pd.plotting.deregister_matplotlib_converters() print(pd.__version__) for key in munits.registry: print(key, '\t', munits.registry[key]) ``` `deregister_matplotlib_converters()` should only remove `pandas` converters, and not any...
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27,480
Use Matplotlib built-in converters for python date(time)s
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2019-07-19T16:12:55Z
2019-07-19T17:39:01Z
2019-07-19T17:39:01Z
CONTRIBUTOR
null
In Matplotlib we have and maintain unit converters for the python build in datetime objects and `np.datetime64`, so there is no need to provide another converter. This would fix https://github.com/pandas-dev/pandas/issues/27479
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27,481
Correctly re-instate Matplotlib converters
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2019-07-19T18:06:00Z
2019-08-21T16:34:46Z
2019-08-20T14:26:50Z
CONTRIBUTOR
null
Fixes https://github.com/pandas-dev/pandas/issues/27479. Converters should only be cached to be re-instated if they are original, and not pandas converters. I'm struggling to write a test for this; I think it requires a clean state with no pandas imports, so one can check what was in the units registry before pandas...
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MDU6SXNzdWU0NzA0ODYxNjk=
27,482
pd.isnull() raises AttributeError on Pandas type objects
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1
2019-07-19T18:48:00Z
2019-08-20T14:00:09Z
2019-08-20T14:00:09Z
NONE
null
```python import pandas as pd x = pd.Series([1,2,3,4]) xt = type(x) pd.isnull(xt) ## Traceback (most recent call last): ## File "<input>", line 1, in <module> ## File "/home/bbassett/venv37/lib/python3.7/site-packages/pandas/core/dtypes/missing.py", line 122, in isna ## return _isna(obj) ## File "/...
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470,512,961
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27,483
Add a "Best Practices" document
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4
2019-07-19T19:53:15Z
2019-12-31T12:34:12Z
null
CONTRIBUTOR
null
I'd like to have a document that describes how we think people should write pandas code. This introduces a bit of friction when documenting something, since you'll need to decide "does it go in best practices or the user guide?" But I think the idea of a "best practices" document with opinionated, short examples and...
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470,545,359
MDU6SXNzdWU0NzA1NDUzNTk=
27,484
IndexError in repr of series objects containing complex numbers with negative imaginary parts
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1
2019-07-19T20:55:42Z
2019-07-25T15:58:18Z
2019-07-25T15:58:18Z
NONE
null
#### Code Sample, a copy-pastable example if possible ```python from pandas import Series print(Series([-1j])) ``` #### Problem description This raises the following error: ``` Traceback (most recent call last): File "foo.py", line 3, in <module> print(Series([-1j])) File "/home/david/.pyen...
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27,485
ASV Benchmark for read_excel
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2019-07-19T22:40:38Z
2019-09-05T17:10:54Z
2019-09-05T17:10:54Z
MEMBER
null
Right now we don't benchmark performance of read_excel across the various engines (xlrd, openpyxl and odfpy) so would gladly accept contributions to improve benchmark coverage on those
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470,609,302
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27,486
BUG: Groupby.transform(name) should only accept valid names
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2019-07-19T23:56:22Z
2019-07-25T22:09:45Z
2019-07-25T22:09:45Z
NONE
null
https://github.com/pandas-dev/pandas/pull/27467#discussion_r305439508 Examples: - `g.transform('invalid_name')` - `g.transform('agg')`, attribute exists but isn't appropriate agg/transformation.
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27,487
REF: Define ExtensionDtype subclasses in consistent locations
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2
2019-07-20T03:19:22Z
2019-11-05T22:10:58Z
2019-11-05T22:10:58Z
MEMBER
null
`CategoricalDtype`, `DatetimeTZDtype`, `PeriodDtype`, and `IntervalDtype` are defined in `core.dtypes.dtypes`. `_IntegerDtype`, `PandasDtype`, and `SparseDtype` are defined in `core.arrays.*`. We should be consistent about where these are defined. My hobby horse right now is the dependency structure. `core.dtypes`...
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470,630,211
MDExOlB1bGxSZXF1ZXN0Mjk5NTMzNzI3
27,488
API: Add entrypoint for plotting
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2019-07-20T03:36:53Z
2019-07-25T20:21:50Z
2019-07-25T17:18:13Z
CONTRIBUTOR
null
Libraries, including pandas, register backends via entrypoints. xref #26747 cc @datapythonista @jakevdp @philippjfr
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MDExOlB1bGxSZXF1ZXN0Mjk5NTUxNTY0
27,489
PERF: speed up IntervalIndex._intersection_non_unique by ~50x
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2019-07-20T09:39:05Z
2019-07-20T17:00:50Z
2019-07-20T16:41:02Z
CONTRIBUTOR
null
I've been backfilling `asv` data and noticed the following regression in `IntervalIndexMethod.time_intersection_both_duplicate` (see [here](https://qwhelan.github.io/pandas/#index_object.IntervalIndexMethod.time_intersection_both_duplicate?machine=T470-W10&os=Linux%204.4.0-17134-Microsoft&ram=20822880&p-param1=100000&c...
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27,490
Timestamp unit is not respected
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2019-07-20T15:05:50Z
2021-03-09T20:46:01Z
null
CONTRIBUTOR
null
Timestamps always get returned in nanoseconds regardless of the unit I specify: ```python import numpy as np, pandas as pd np.datetime64("2018-01-01").astype("datetime64[s]").astype(int) >>> 1514764800 pd.Series(np.datetime64("2018-01-01")).astype("datetime64[s]") ``` ``` 0 2018-01-01 dtype: datetime64[ns] ...
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DOC: setup 1.0.0 docs
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27,492
RLS: 1.0.0
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26
2019-07-20T17:02:30Z
2020-01-30T12:34:23Z
2020-01-30T12:17:42Z
CONTRIBUTOR
null
discussion for 1.0. We are focusing all deprecation removals and we should try to release by September 2019.
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27,493
BUG: .loc behavior for multiindex containing IntervalIndex level
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2019-07-20T18:15:31Z
2019-08-02T15:35:09Z
2019-08-02T15:35:09Z
NONE
null
<del>Supersedes #27456</del> #27456 has been updated. closing as duplicate.
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27,494
ENH: treat list of namedtuples like list of dict in DataFrame()
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2
2019-07-20T18:40:11Z
2019-07-31T14:25:53Z
2019-07-31T14:25:47Z
NONE
null
Following discussion in https://github.com/pandas-dev/pandas/pull/27309 about unifying "list of records" behavior across the board. - [X] closes #27329 - [ ] tests added / passed - [X] whatsnew entry - [ ] double check performance impact and update docs accordingly if needed.
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27,495
PERF: speed up MultiIndex.is_monotonic by 50x
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1
2019-07-20T23:54:04Z
2019-07-23T22:04:28Z
2019-07-23T22:04:24Z
CONTRIBUTOR
null
The current logic for `MultiIndex.is_monotonic` relies on `np.lexsort()` on `MultiIndex._values`. While the result is cached, this is slow as it triggers the creation of `._values`, needs to perform an `O(n log(n))` sort, as well as populate the hashmap of a transient `Index`. This PR significantly speeds up this ch...
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27,496
Lost timezone information after groupby transform
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2019-07-21T00:18:14Z
2019-07-22T15:27:40Z
2019-07-22T15:27:40Z
NONE
null
#### Code Sample, a copy-pastable example if possible Similar issue as #24198 in pandas 0.25.0 ```python import pandas as pd df = pd.DataFrame({'time': [pd.Timestamp('2010-07-15 03:14:45'), pd.Timestamp('2010-11-19 18:47:06')], 'timezone': ['Etc/GMT+4', 'US/Ea...
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27,497
Nanosecond resolution in time indexing
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2019-07-21T01:13:35Z
2019-11-02T21:56:03Z
2019-11-02T21:56:03Z
NONE
null
I have a dataframe with `DatetimeIndex`. I note the following difference of behavior in `0.24.2` against `0.25.0`. For equivalent Timestamp indices, `0.25.0` returns an empty Series, while `0.24.2` returns one value. ```python print(start) Timestamp('2019-06-24 16:56:11.200999936') print(stop) Timestamp('20...
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27,498
Investigate whether re-encoding MultiIndex levels is beneficial
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0
2019-07-21T02:09:24Z
2020-10-27T12:51:13Z
2020-10-27T12:51:13Z
CONTRIBUTOR
null
Follow up for #27495, where we handle the common case of `MultiIndex` being created from helper functions that ensure the levels are sorted. In order to handle the case of `MultiIndex(codes=..., labels=...)` and labels being individually unsorted, we likely need to re-encode that level. If that is performant, it would ...
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27,499
REF: de-privatize dtypes.concat functions
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1
2019-07-21T04:09:01Z
2019-07-22T21:30:50Z
2019-07-22T21:14:54Z
MEMBER
null
Preliminary to possibly finding new homes for some of these functions that don't really fit in core.dtypes (discussed briefly at the sprint). xref #25273
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27,500
crosstabs doesn't work with margin and normalize together
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2019-07-21T09:05:28Z
2019-08-06T15:45:31Z
2019-08-06T15:45:31Z
NONE
null
#### Code Sample, a copy-pastable example if possible ```python import pandas as pd df = pd.DataFrame({"A": ["foo", "foo", "foo", "foo", "foo", "bar", "bar", "bar", "bar"], "B": ["one", "one", "one", "two", "two", "one", "one", "two", "two"], ...
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27,501
pd.to_csv gives '__init__() got an unexpected keyword argument 'tupleize_cols'`
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4
2019-07-21T09:50:24Z
2019-08-21T15:53:02Z
2019-07-21T16:15:02Z
NONE
null
Hi, I have an issue which might be related to this: I'm running the following basic code: <code>`dfMain.to_csv('./January_filtered_International_WE.csv')` </code> which used to run normally until yesterday. Yesterday morning I upgraded to `pandas 0.25.0` while running code and now I cannot write a 500k rows (...
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470,781,354
MDU6SXNzdWU0NzA3ODEzNTQ=
27,502
MultiIndex with Period level is really slow
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2019-07-21T13:23:41Z
2019-07-22T04:43:52Z
null
NONE
null
A MultiIndex with a Period level is multiple levels of magnitude slower to join than a same-sized single Period index, or the same sized MultiIndex with Dates instead of Periods. In this benchmark, I construct a the multiindexes and single index referred to above by making a date/period range, and adding it to a sin...
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470,789,116
MDExOlB1bGxSZXF1ZXN0Mjk5NjQxMzcw
27,503
TST: reenable some old quantile tests
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2019-07-21T14:42:02Z
2019-08-02T14:44:29Z
2019-07-31T14:07:09Z
NONE
null
These disabled tests now pass on 3.7. Let's see what CI says.
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470,795,862
MDExOlB1bGxSZXF1ZXN0Mjk5NjQ1OTk4
27,504
ENH: Add Series.set_index
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2019-07-21T15:47:56Z
2019-08-02T14:44:05Z
2019-07-31T14:16:13Z
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- [X] closes #27058, #21684 - [X] whatsnew entry - [x] append and list of levels (like `DataFrame.set_index` has) - [ ] tests added / passed Help users method-chain all the things. This is modeled closely on the original support for Arrays added in 2011 by Wes Mckinney in 553bacc7abe341991e4d043a5c17521902c...
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27,505
Update issue template
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2019-07-21T15:58:52Z
2019-08-02T14:43:34Z
2019-07-21T17:08:57Z
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MDU6SXNzdWU0NzA4MDA0MjM=
27,506
ensure_int_or_float Surprising Behavior with Int64 / ExtensionArrays
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2019-07-21T16:38:49Z
2021-04-19T13:51:57Z
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MEMBER
null
Unearthed as part of #27424 ```python >>> import pandas as pd >>> from pandas.core.dtypes.common import ensure_int_or_float >>> ensure_int_or_float(pd.Series(range(3), dtype='Int64')) 0 0 1 1 2 2 dtype: int64 # Directly against PandasArray now >>> ensure_int_or_float(pd.Series(range(3), dtype='...
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MDExOlB1bGxSZXF1ZXN0Mjk5NjU1MTU3
27,507
remove last references to v0.18 in docs and code
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2019-07-21T18:18:53Z
2019-07-22T12:08:28Z
2019-07-22T12:07:10Z
CONTRIBUTOR
null
- [x] xref #27463 Somehow all the changes didn't get added to #27463, so here's a follow-up. I've also removed a reference to 0.17 in style.ipynb which also makes the styler api non-provisional.
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27,508
remove references to v0.19 in docs and code
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2019-07-21T18:41:29Z
2019-07-23T09:11:06Z
2019-07-22T12:08:40Z
CONTRIBUTOR
null
- [x] xref #27507
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470,812,918
MDU6SXNzdWU0NzA4MTI5MTg=
27,509
Add 'nice' date-time x-axis labels for non-regular time series plots
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2019-07-21T18:55:32Z
2021-07-10T18:39:22Z
null
CONTRIBUTOR
null
#### Code Sample, a copy-pastable example if possible ```python import pandas as pd import numpy as np df1 = pd.DataFrame({'a':np.arange(5)}, index=pd.DatetimeIndex(['2019-07-01 12:00:00', '2019-07-01 17:00:00', ...
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27,510
BUG: Retain tz transformation in groupby.transform
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MEMBER
null
- [x] closes #27496 - [x] tests added / passed - [x] passes `black pandas` - [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff` - [x] whatsnew entry
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BUG: display.precision of negative complex numbers
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2019-07-22T00:58:27Z
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- [x] closes #27484 - [x] tests added / passed - [x] passes `black pandas` - [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff` - [x] whatsnew entry
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470,848,532
MDExOlB1bGxSZXF1ZXN0Mjk5NjgyMzkx
27,512
more type hints for io/formats/format.py
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2019-07-22T01:02:12Z
2019-07-24T23:33:10Z
2019-07-24T11:58:30Z
MEMBER
null
another pass to follow-on from #27418
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