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14,108
ENH: Add pd.to_period
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5
2016-08-28T11:11:51Z
2018-10-26T20:53:52Z
2018-10-25T22:38:55Z
MEMBER
null
Would return `Period` or `PeriodIndex`, analogous to functions like `to_datetime` and `to_timedelta`. xref #5886 xref #14048 cc @sinhrks
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BUG: pass *args and **kwargs for wrapped methods in Groupby (#14107)
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11
2016-08-28T11:25:36Z
2017-04-03T15:26:43Z
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NONE
null
- [x] closes #14107 - [ ] tests added / passed - [ ] passes `git diff upstream/master | flake8 --diff` - [ ] whatsnew entry Methods such as 'hist' that take keyword arguments would now be able to be called via a Groupby object and the keyword args would be passed onwards to matplotlib as the user expects.
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14,110
Performance regression in DataFrame.to_csv
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2016-08-28T13:44:06Z
2016-08-28T13:53:01Z
2016-08-28T13:52:18Z
NONE
null
Hello, I recently upgraded from pandas 0.17.1 to 0.18.1 and ran into a performance regression with DataFrame.to_csv: #### Code Sample, a copy-pastable example if possible import pandas import numpy import tempfile fd, filename = tempfile.mkstemp(prefix='to_csv_', suffix='.csv') test = pandas.DataFrame(numpy.random.ra...
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TST: Enable Google BigQuery (pandas.io.gbq) integration testing #11089
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2016-08-28T13:51:32Z
2016-09-03T13:53:38Z
2016-08-31T12:47:53Z
CONTRIBUTOR
null
- [ x ] closes #11089 - [ x ] tests added / passed - [ x ] passes `git diff upstream/master | flake8 --diff`
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14,112
Test for segfault in factorize (gh12666)
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2016-08-28T15:09:35Z
2016-08-31T16:17:19Z
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CONTRIBUTOR
null
- [x] closes #12666 - [x] tests added / passed - [ ] passes `git diff upstream/master | flake8 --diff` Not sure about the last. It's my first PR.
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DEPR: Deprecated PeriodIndex.to_datetime
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6
2016-08-28T17:25:56Z
2016-09-01T08:18:46Z
2016-09-01T08:03:39Z
MEMBER
null
Continuation of #14096 by deprecating `PeriodIndex.to_datetime` in favour of `PeriodIndex.to_timestamp`. Also addresses #8254.
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Test for Python 3.5 with C locale
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2016-08-28T17:35:45Z
2016-09-10T14:39:34Z
2016-09-10T14:38:17Z
CONTRIBUTOR
null
As @jreback suggested, I'm adding an alternate py3 build to change LOCALE, based on the 3.4 slow build, to reveal some encoding bugs (see #12337) I'm new to configuring Travis, I just hope this will work as I expect and that the tests will fail. - [ ] closes #12337 - [x] tests added but not passed? - [ ] passes `git ...
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DOC: small update to install.rst page
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2016-08-28T18:34:52Z
2016-08-29T12:44:19Z
2016-08-29T12:44:19Z
MEMBER
null
Move some content from the removed content on dependencies from the README (see GH13882) I was going through the install.rst, and updated some small things, but there was actually no content from README to be moved.
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API: Raise FileNotFoundError in read_csv
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2016-08-29T03:50:30Z
2016-09-01T08:19:15Z
2016-09-01T08:19:15Z
MEMBER
null
For a nonexistent file, raise the more specific `FileNotFoundError` for Python >= 3.3 in `read_csv`. Closes #14086.
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14,117
TST: confirming tests for some fixed issues
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3
2016-08-29T14:10:49Z
2016-09-01T07:28:07Z
2016-09-01T07:28:07Z
MEMBER
null
closes #7710, closes #8617, closes #13119 Closes a few issues still tagged with 0.19.0 that only need a confirming test
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BUG: series resample with timedelta values looses dtype (GH13119)
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2016-08-29T16:42:25Z
2016-08-31T07:52:49Z
2016-08-31T07:52:49Z
MEMBER
null
- [x] closes #13119 - [x] tests added / passed - [x] passes `git diff upstream/master | flake8 --diff` - [x] whatsnew entry
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14,119
unable to set xticks within bar() plotting function
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2
2016-08-29T20:28:39Z
2019-09-23T16:34:55Z
2019-09-23T16:34:55Z
NONE
null
#### Code Sample, a copy-pastable example if possible In the code below: ``` python pd.Series(range(10), index=range(10)).plot.bar(xticks=range(0, 11, 2)) ``` `xticks` argument has no effect. However, there's no such problem in line() plot. #### Expected Output Output plot is expected to have xticks defined by `xt...
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14,120
API: Warn or raise for > 1 char encoded sep
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4
2016-08-30T02:44:55Z
2016-08-31T16:10:31Z
2016-08-31T16:10:31Z
MEMBER
null
The system file encoding can cause a separator to be encoded as more than one character even though it maybe provided as one character. Multi-char separators are not supported by the C engine, so we need to catch this case. Closes #14065.
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BUG: #14095. Amend eval() resolvers kwarg to accept lists
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2016-08-30T13:15:33Z
2016-08-31T16:05:11Z
2016-08-31T16:05:06Z
CONTRIBUTOR
null
- [x] closes #14095 - [x] tests added / passed - [ ] passes `git diff upstream/master | flake8 --diff` - [x] whatsnew entry
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14,122
Saving CSV with backslashed-escaping is not idempotent.
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19
2016-08-31T00:35:58Z
2021-07-03T18:23:12Z
null
NONE
null
@pdbaines and I noticed this bug. I want Pandas to write a CSV file so that all field data is backslash escaped if the character has a special interpretation (e.g. quotes or backslashes themselves). If a quote is backslashed, it is treated as field data, rather than a special character. This is not the behavior that I...
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14,123
WIP: API: Add support for PEP 519 / file system path protocol
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2016-08-31T00:54:10Z
2017-05-08T09:28:00Z
2017-05-07T14:03:53Z
NONE
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- [ ] closes #13823 - [ ] tests added / passed - [ ] passes `git diff upstream/master | flake8 --diff` - [ ] whatsnew entry
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BUG: read_csv() does strange things if data rows have trailing delimiter
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2016-08-31T07:27:22Z
2020-02-11T02:05:43Z
2016-11-23T13:21:07Z
CONTRIBUTOR
null
Given a file `t.txt` like this: ``` A,B,C 1,4,7, 2,5,8, 3,6,9, ``` `pandas.read_csv('t.txt')` produces: ``` A B C 1 4 7 NaN 2 5 8 NaN 3 6 9 NaN ``` In other words, it implies a nonexistent header column for what it believes is the index. I would expect it to do the same as this code: ``` pd.read_csv('...
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BUG: read_csv() crashes with engine='c'
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2
2016-08-31T08:49:58Z
2017-01-24T23:13:38Z
2017-01-24T23:13:38Z
CONTRIBUTOR
null
Here's the code (input data is at the end of this message): ``` pd.read_csv('foo.csv', header=None, usecols=[0]) ``` It fails with: ``` File "pandas/parser.pyx", line 805, in pandas.parser.TextReader.read (pandas/parser.c:8748) File "pandas/parser.pyx", line 827, in pandas.parser.TextReader._read_low_memory (pandas/...
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14,126
Make show_versions not to reload modules (GH13684)
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2
2016-08-31T10:35:26Z
2016-09-01T07:28:54Z
2016-09-01T07:28:54Z
MEMBER
null
closes #13684
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14,127
API/DEPR: Remove +/- as setops for Index (GH8227)
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2016-08-31T10:38:15Z
2016-09-07T13:24:30Z
2016-09-06T14:30:58Z
MEMBER
null
xref #13777, deprecations put in place in #8227 - [x] tests added / passed - [x] passes `git diff upstream/master | flake8 --diff` - [x] whatsnew entry
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14,128
Possibility to draw random markers in line plots
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2016-08-31T11:41:57Z
2016-10-04T09:10:06Z
null
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#### Code Sample, a copy-pastable example if possible I often have dataframes with many obervations and want to have a quick glance at the data using a line plot. The problem is that the colors of the colormap are either repeated over X observations or hard to distinguish e.g. in case of sequential colormaps. So my ...
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14,129
Change DataFrame to_sql's first parameter to something more descriptive
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2
2016-08-31T14:55:22Z
2021-05-01T23:29:13Z
2021-05-01T23:29:13Z
NONE
null
This is a high-level suggestion. `DataFrame.to_sql(name, con, ...)` It's not intuitive if `name` means name of database or name of table in database. I think something like `table_name` or `tablename` would better explain what `name` is. Yes, I know I can Google it every time and eventually after Googling it so man...
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14,130
API: engine kw to .plot to enable selectable backends
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31
2016-08-31T15:58:03Z
2019-08-05T06:26:52Z
2019-06-21T09:37:18Z
CONTRIBUTOR
null
We have had some conversations in the past regarding an `.plot(....., engine=)` kw. in #8018 This would allow pandas to redirect the plotting to a user selectable back-end, keeping `matplotlib` as the default. see [chartpy here](https://github.com/cuemacro/chartpy), for a way to selectively enable `matplotlib`, `boke...
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14,131
BUG: max rows in read_csv
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2016-08-31T22:04:34Z
2019-10-21T19:52:16Z
null
NONE
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I have 5e9 rows csv file that I'm trying to load with pandas, which appears to load it only partially and produces 2852516352 rows data frame. ``` py #Python 2.7.3 (default, Jun 22 2015, 19:33:41) #[GCC 4.6.3] on linux2 #Type "help", "copyright", "credits" or "license" for more information. import pandas as pd import...
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14,132
BUG: Don't print stray newline with MultiIndex
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2
2016-09-01T05:15:08Z
2016-09-02T11:19:50Z
2016-09-02T11:19:42Z
MEMBER
null
Title is self-explanatory. Closes #6618.
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14,133
bug: double print statement in groupby / apply
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1
2016-09-01T10:09:28Z
2016-09-01T10:11:59Z
2016-09-01T10:11:58Z
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#### Code Sample This is based on http://stackoverflow.com/questions/39268147/understand-pandas-groupby-apply-behaviour/39268538#39268538. ``` import seaborn as sns iris = sns.load_dataset('iris') iris.ix[1:100:10].groupby(["species"]).apply(lambda x: print(len(x), '\n***\n', x)) ## first try iris.ix[1:10...
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14,134
DataFrame.groupby.expanding duplicates grouped dimensions
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2016-09-01T11:40:02Z
2016-09-01T11:47:46Z
2016-09-01T11:46:34Z
NONE
null
While using a `groupby`, applying an `expanding` function duplicates the grouped dimensions. I would expect the result of this to work like `groupby.cumsum` where the `expanding` function is applied over the groups and then the result has the same index as the original data frame. #### Code Sample, a copy-pastable exa...
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14,135
read_fwf does not use comment character if colspecs argument does not include first column
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2016-09-02T01:31:37Z
2021-11-01T13:14:51Z
2021-11-01T13:14:51Z
NONE
null
When reading fixed-width files using the `read_fwf` function, it is possible to specify a comment character using the `comment` argument. I expected that all lines beginning with the comment character would be ignored. However, if you do not specify the first column in the file in any column in `colspecs`, the comment ...
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transpose subplots
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3
2016-09-02T12:29:54Z
2016-09-04T11:31:43Z
2016-09-02T14:10:55Z
NONE
null
Right now its easy to plot columns as rows like this: df.plot(subplots=True, layout = (15, 1),legend=False) # for a 300x15 dataframe which gives very nice row plots like this: ![rows](https://cloud.githubusercontent.com/assets/1256202/18203706/e4d66ac2-7118-11e6-9933-22c919ddf1ba.png) However sometimes it is needed to...
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14,137
Series/DataFrame breaks truth-checking
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6
2016-09-02T14:28:39Z
2016-09-05T22:42:56Z
2016-09-02T21:05:50Z
CONTRIBUTOR
null
This behavior is obviously by design. Why choose to break substitutability? ``` >>> bool([]) False >>> bool(numpy.array([])) False >>> bool(pandas.Series(numpy.array([]))) Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/si...
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14,138
Feature request: Advanced masking (e.g. `0 < pd.Series(x) < 1`)
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4
2016-09-02T19:33:12Z
2016-09-02T22:37:44Z
2016-09-02T21:03:49Z
NONE
null
**Can there be a way to to do masking that is dependent on more than one boolean?** ![screen shot 2016-09-02 at 12 28 06 pm](https://cloud.githubusercontent.com/assets/9061708/18215964/d1c2097e-7108-11e6-8ec2-c3e88b189d74.png) ``` 0 < pd.Series(x) < 1 -----------------------------------------------------------------...
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14,139
Renaming an empty MultiIndex fails
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1
2016-09-02T20:23:39Z
2016-09-02T21:17:23Z
2016-09-02T21:16:54Z
NONE
null
``` python s = pd.Series([0], index=pd.MultiIndex.from_tuples([('a', 1)])) # This works: s.rename(lambda x: x) # This fails: s.iloc[0:0].rename(lambda x: x) ``` Renaming an empty index should not throw an error. It should just return the original empty index. It appears to be failing because `_transform_index` calls...
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TST: windows failures
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2016-09-02T22:37:52Z
2016-09-08T22:12:53Z
2016-09-08T22:12:53Z
CONTRIBUTOR
null
``` ====================================================================== FAIL: test_c_engine (pandas.io.tests.parser.test_unsupported.TestUnsupportedFeatures) ---------------------------------------------------------------------- Traceback (most recent call last): File "C:\Users\conda\Documents\pandas3.5\pandas\io\...
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14,141
TST: sparse / dummy array comparisons on windows, xref #14140
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0
2016-09-02T23:35:24Z
2016-09-03T00:00:37Z
2016-09-03T00:00:37Z
CONTRIBUTOR
null
partial on #14140
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14,142
TST: fix blosc version
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0
2016-09-02T23:48:14Z
2016-09-02T23:52:39Z
2016-09-02T23:52:39Z
CONTRIBUTOR
null
something wrong with update for blosc=1.4.3 (latest via pip).
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TST: blosc>1.4.1 failing
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1
2016-09-02T23:49:40Z
2016-09-03T14:50:08Z
2016-09-03T14:50:08Z
CONTRIBUTOR
null
xref: https://github.com/pydata/pandas/pull/14142 seems this update just hit and failing 1 tests [here](https://travis-ci.org/pydata/pandas/jobs/157218567) worked [here](https://travis-ci.org/pydata/pandas/jobs/157068571) seems like a back-compat issue (new blosc not reading older blosc?) ``` =======================...
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14,144
Add the steps to setup gbq integration testing to the contributing docs
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16
2016-09-03T13:43:30Z
2016-09-07T13:23:03Z
2016-09-07T13:22:53Z
CONTRIBUTOR
null
Pull requests from forked repositories cannot access the existing secure Google BigQuery credentials which are on Travis at pydata/pandas. In order for contributors to run Google BigQuery integration tests on Travis, they need to create a pull request on their forked repository of pandas with their own secure Google Bi...
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14,145
CLN/BUG: fix ndarray assignment may cause unexpected cast
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2016-09-04T01:10:37Z
2017-05-21T19:49:10Z
2017-05-21T19:49:10Z
MEMBER
null
- [x] closes #14001 - [x] tests added / passed - [x] passes `git diff upstream/master | flake8 --diff` - [x] whatsnew entry Fixed a bug with assignment against block may be coerced incorrectly. ``` s = pd.Series([pd.Timestamp('2011-01-01'), pd.Timestamp('2012-01-01')]) s[1] = 1 s #0 2011-01-01 00:00:00.000000000 #1...
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14,146
BUG: DatetimeTZBlock can't assign values near dst boundary
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2016-09-04T01:14:48Z
2016-09-10T14:34:57Z
2016-09-10T14:34:57Z
MEMBER
null
- [x] tests added / passed - [x] passes `git diff upstream/master | flake8 --diff` - [x] whatsnew entry Value assignment doesn't work if data contains DST boundary because of internal `.localize(None)`. ``` s = pd.Series(pd.date_range('2016-11-06', freq='H', periods=3, tz='US/Eastern')) s[1] = pd.Timestamp('2011-01-...
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14,147
MAINT: flake8 *.pyx files
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2016-09-04T06:43:56Z
2016-09-06T10:18:35Z
2016-09-06T10:18:08Z
MEMBER
null
closes #12995 flake8-ed *.pyx files and fixed errors. Removed the E226 check because that inhibits pointers (e.g. char*). In addition, the check is not even universally accepted in Python.
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14,148
Datatime stored in DataFrame loses tz info and it goes to hour:minute
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2016-09-04T16:27:14Z
2016-09-04T18:26:22Z
2016-09-04T17:46:15Z
NONE
null
``` #With this code: #----------------------------- from datetime import datetime import pytz from pandas import DataFrame original_date = datetime(2016, 9, 2, 0, 0, 0, 0, pytz.timezone('America/Manaus')) dataframe = DataFrame(columns = ['stored_date']) dataframe.loc['A'] = [original_date] print("I expect it shows '2...
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14,149
NaT treatment in pandas groupby/nunique
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2016-09-04T19:09:06Z
2021-05-01T23:35:37Z
2021-05-01T23:35:37Z
NONE
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#### Code Sample, a copy-pastable example if possible Calling nunique on a column that contains NaT results in this FutureWarning from numpy: ``` python35\lib\site-packages\pandas\core\groupby.py:2854 FutureWarning: In the future, NAT != NAT will be True rather than False. inc = np.r_[1, val[1:] != val[:-1]] ``` ...
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14,150
SettingWithCopy dependence on reference count
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2016-09-04T23:06:59Z
2020-09-06T18:50:04Z
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NONE
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As a follow-up to my [question](http://stackoverflow.com/questions/39321914/unpredictable-pandas-slice-assignment-behavior-with-no-settingwithcopywarning), I believe the current approach is that pandas assumes that the programmer intends assignment to a child DF/S to be propagated to the parent DF/S _as long as the par...
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14,151
BUG/TST: Empty input arrays in cartesian_product and MultiIndex (#12258)
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2016-09-05T04:46:36Z
2016-09-27T10:36:44Z
2016-09-27T10:36:44Z
CONTRIBUTOR
null
- [x] closes #12258 - [x] tests added / passed - [x] passes `git diff upstream/master | flake8 --diff` - [x] whatsnew entry This commit: 1. fixes logic (and division by 0) in `cartesian_product` when some input arrays are empty 2. adds tests for MultiIndex empty level construction with `.from_arrays` and `.from_produ...
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14,152
Feature request: Access multiindex by name
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2016-09-05T08:27:19Z
2016-09-06T10:44:29Z
2016-09-05T15:07:12Z
NONE
null
#### Code Sample, a copy-pastable example if possible I have not found an easy way to access a column of a multi index by name. Consider the following code: ``` import pandas as pd df = pd.DataFrame([[1,1,10,200], [1,2,11,201], [1,3,12,202], [2,1,13,210], ...
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14,153
Fix typo (change 'n' to 'k' in get_dummies documentation)
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2
2016-09-05T12:19:02Z
2016-09-05T14:16:35Z
2016-09-05T14:16:31Z
CONTRIBUTOR
null
Just changing an `n` to a `k`.
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14,154
ENH: allow usecols to be case insensitive
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9
2016-09-05T15:24:54Z
2016-12-06T11:38:06Z
2016-12-06T11:38:06Z
CONTRIBUTOR
null
I have a wide delimited file that includes columns with predictable names but unpredictable capitalisation, as shown in this toy code. ``` python import pandas as pd from io import StringIO data = """1,1,1,1 2,2,2,2 3,3,3,3 4,4,4,4 5,5,5,5""" names = ['col1', 'col2', 'COL3', 'Col4'] df = pd.read_csv(StringIO(data), n...
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14,155
Bug when assigning timedelta64 to a series (or dataframe) with an indexer
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2
2016-09-05T15:55:32Z
2016-09-08T10:22:35Z
2016-09-08T10:22:35Z
NONE
null
#### Code Sample, a copy-pastable example if possible ``` In [2]: import pandas as pd In [3]: import numpy as np In [4]: s = pd.Series(10*[np.timedelta64(10, 'm')]) In [5]: s Out[5]: 0 00:10:00 1 00:10:00 2 00:10:00 3 00:10:00 4 00:10:00 5 00:10:00 6 00:10:00 7 00:10:00 8 00:10:00 9 00:10:00 dt...
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175,107,075
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14,156
BUG: conversion precision on Timedeltas
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3
2016-09-05T17:09:20Z
2018-05-21T11:06:04Z
2018-05-21T11:06:04Z
CONTRIBUTOR
null
I think this is rounding prematurely, though not entirely sure. Could also just be loss of precision when converting from a float -> int64. ``` In [12]: pd.to_datetime(1434743731.8770001,unit='s') Out[12]: Timestamp('2015-06-19 19:55:31.877000') In [13]: pd.to_datetime(1434743731.8770001,unit='s').value Out[13]: 1434...
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14,157
ENH: function to take DatetimeIndex and adjust for leapseconds
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1
2016-09-05T17:16:19Z
2017-12-15T01:18:37Z
2017-12-15T01:18:37Z
CONTRIBUTOR
null
[leapseconds list here](https://github.com/eggert/tz/blob/master/leap-seconds.list). [SO discussion here](http://stackoverflow.com/questions/19332902/extract-historic-leap-seconds-from-tzdata). This info is actually available from the tzinfo, though I don't think `pytz` is reading it. [astropy docs](http://docs.astro...
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14,158
ENH: Reduce DF/Series to smallest possible dtype
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3
2016-09-05T17:28:46Z
2016-09-06T14:24:32Z
2016-09-05T17:34:42Z
CONTRIBUTOR
null
Hi, I have been currently working with dataset mostly consisting of binary features (column has only 1, 0 or NaN). I know there is a `category` dtype, but that is not usable in some cases, e.g. when you want to store it HDF and can't use `tables` format (e.g. because of to wide tables). I have datasets with about 50k ...
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14,159
WIP/ENH: reading older Stata versions, #11526
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7
2016-09-05T19:43:57Z
2016-09-11T13:55:44Z
2016-09-11T13:55:39Z
CONTRIBUTOR
null
A simple file seems to read OK if we just treat it like other "old format" (version 104-115) files. However I do not currently have any documentation for this format. The only relevant resource I can find is the file `foreign/src/stataread.c` in the R `foreign` package sources: https://cran.r-project.org/src/contrib...
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14,160
BUG : assignment of non-ns timedelta64 value (GH14155)
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2016-09-06T01:51:49Z
2016-09-08T10:22:40Z
2016-09-08T10:22:35Z
NONE
null
- [x] closes #14155 - [x] tests added / passed - [x] passes `git diff upstream/master | flake8 --diff` - [x] whatsnew entry
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14,161
TST: Make encoded sep check more locale sensitive
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8
2016-09-06T02:08:59Z
2016-09-08T22:13:08Z
2016-09-08T22:12:53Z
MEMBER
null
Follow-up to #14120 to make the `sep` check more locale sensitive. Closes #14140.
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14,162
Unexpected results for the mean of a DataFrame of ufloat from the uncertainties package.
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2016-09-06T07:31:50Z
2021-05-01T23:37:23Z
null
NONE
null
Related to #6898. I find it very convenient to use a DataFrame of `ufloat` from the `uncertainties` package. Each entry consists of (value, error) and could represent the result of Monte Carlo simulations or an experiment. At present taking sums along both axes gives the expected result, but taking the mean does not....
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14,163
ERR: improves message raised for bad names in usecols (GH14154)
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2016-09-06T13:59:11Z
2017-02-27T21:05:09Z
2017-02-27T16:04:20Z
CONTRIBUTOR
null
- [X] partial fix for #14154 - [X] tests added / passed - [X] passes `git diff upstream/master | flake8 --diff` - [X] whatsnew entry
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175,283,781
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14,164
API/DEPR: Remove +/- as setops for DatetimeIndex/PeriodIndex (GH9630)
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4
2016-09-06T15:53:21Z
2016-09-07T13:24:30Z
2016-09-07T13:11:04Z
MEMBER
null
xref #13777, deprecations put in place in #9630
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14,165
BUG: pandas.Series.astype('category', categories=[list_of_categories]) returns all NaNs
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1
2016-09-06T20:51:29Z
2016-09-06T21:06:08Z
2016-09-06T21:05:08Z
CONTRIBUTOR
null
The following code returns all NaN's instead of "given" categories: #### Code Sample, a copy-pastable example if possible ``` In [25]: df = pd.DataFrame({'a':['aa','bb','cc','dd']}) In [26]: df Out[26]: a 0 aa 1 bb 2 cc 3 dd In [27]: df.a.astype('category', categories=[0,1,2,3]) Out[27]: 0 NaN 1 NaN 2 ...
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14,166
Sparse becomes float under fancy indexing
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2016-09-06T23:45:19Z
2016-09-07T03:30:53Z
2016-09-07T00:15:32Z
CONTRIBUTOR
null
``` python >>> pd.SparseSeries([False, True], dtype=bool)[[0, 1]] 0 0.0 1 1.0 dtype: float64 BlockIndex Block locations: array([1], dtype=int32) Block lengths: array([1], dtype=int32) ``` #### Expected output ``` 0 False 1 True dtype: bool BlockIndex Block locations: array([1], dtype=int32) Block lengths: ...
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14,167
SparseSeries.__array__ only returns non-fills
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2016-09-06T23:51:36Z
2019-02-09T09:18:54Z
2018-10-17T13:50:11Z
CONTRIBUTOR
null
#### Code Sample, a copy-pastable example if possible ``` python >>> np.array(pd.SparseSeries([0, 1], fill_value=0)) array([1]) ``` #### Expected Output ``` array([0, 1]) ``` this should really be consistent with `Series` rather than just returning the non-fill values (i.e. rather than being equivalent to `np.array(...
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hyperinks
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2016-09-07T02:31:26Z
2016-09-07T03:36:28Z
2016-09-07T03:36:07Z
NONE
null
#### Code Sample, a copy-pastable example if possible #### Expected Output #### output of `pd.show_versions()`
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14,169
Passing psycopg2 DictRow raises TypeError
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2
2016-09-07T06:23:45Z
2018-05-16T13:39:45Z
2016-09-07T10:39:47Z
NONE
null
Maybe something you want to look into: http://stackoverflow.com/questions/35604186/convert-psycopg2-dictrow-query-to-pandas-dataframe ``` curs = conn.cursor(cursor_factory=psycopg2.extras.DictCursor) curs.execute("SELECT * FROM mytable") data = curs.fetchall() print pd.DataFrame(list(data)) ``` Will produce a TypeEr...
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14,170
Can't iterate a DataFrameGroupBy object if the group by key contains NaN
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2016-09-07T06:55:32Z
2016-09-07T10:33:17Z
2016-09-07T10:31:52Z
NONE
null
#### Code Sample, a copy-pastable example if possible ``` import pandas as pd df = pd.DataFrame({'a': [1,2,3,4], 'b':[None, None, None, None]}) chunks = df.groupby('a') assert len([g for g, chunk in chunks]) == 4 chunks = df.groupby(['a', 'b']) # failed here, it's emtpy assert len([g for g, chunk in chunks]) == 4 ...
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14,171
Series.str.contains doesn't correct if series contains only nan values.
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2016-09-09T22:29:16Z
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#### Code Sample, a copy-pastable example if possible ``` python import pandas as pd import numpy as np import re CONTAINS_REG_EXP = ur'{0}' value = '3' t1 = pd.Series(data=[np.nan, np.nan, np.nan], dtype=np.object) t2 = t1.str.contains(CONTAINS_REG_EXP.format(re.escape(value)), flag...
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14,172
DOC: cleanup build warnings
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14,173
BUG: union_categoricals w/Series & CategoricalIndex
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2016-09-07T10:11:28Z
2016-09-10T14:30:49Z
2016-09-10T14:30:49Z
CONTRIBUTOR
null
``` In [25]: from pandas.types.concat import union_categoricals In [26]: s1 = pd.Series(['a', 'b'], dtype='category') ...: s3 = pd.Series(['a', 'b', 'c'], dtype='category') In [27]: s1 Out[27]: 0 a 1 b dtype: category Categories (2, object): [a, b] In [28]: s3 Out[28]: 0 a 1 b 2 c dtype: categor...
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14,174
Fix trivial typo in comment
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2016-09-07T10:28:45Z
2016-09-07T10:49:41Z
2016-09-07T10:49:24Z
CONTRIBUTOR
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14,175
TypeError bug when using pandas.to_timedelta (astype() unexpected argument 'copy')
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2016-09-07T10:36:18Z
2016-09-07T10:58:10Z
2016-09-07T10:41:33Z
NONE
null
#### Code Sample Running the following code: ``` python import numpy as np import pandas as pd df = pd.DataFrame(np.random.randn(6,4),columns=list('ABCD')) pd.to_timedelta(df.index,unit='s') ``` returns a `TypeError`: ``` --------------------------------------------------------------------------- TypeError ...
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14,176
DOC: clean-up 0.19.0 whatsnew file
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2016-09-07T10:50:38Z
2016-09-07T19:15:38Z
2016-09-07T19:15:38Z
MEMBER
null
WIP (it's actually not critical for rc, as we do link to the dev docs (which are updated after rc release) anyway)
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14,177
API: union_categoricals in concat
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2016-09-07T13:20:54Z
2021-05-01T23:38:21Z
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Follow up of https://github.com/pydata/pandas/pull/13767 (this part was left out of the final merged version). Summary copied from there: **Discussion: addition of new keyword to `concat` to union categoricals with different categories** PR #13767 proposed to add a `union_categoricals` keyword to `concat`, which lets...
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14,178
DOC: source links in API reference
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2016-09-07T14:51:28Z
2016-09-14T09:17:09Z
2016-09-12T07:57:26Z
CONTRIBUTOR
null
For example, from numpy. http://docs.scipy.org/doc/numpy/reference/generated/numpy.take.html I don't know enough about sphinx to know how hard/easy this is, but it may be nice.
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14,179
setitem type coercion fails when setting a datetime column in a single row dataframe
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2016-09-07T22:40:35Z
2020-01-28T01:24:10Z
2017-10-30T10:56:42Z
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xref #6942 xref #12499 ``` python import datetime import pandas as pd df1 = pd.DataFrame({'a': [0,1], 'b': [datetime.datetime.now(), datetime.datetime.now()]}) # next line works as expected df1.loc[:,'b'] = [datetime.datetime.now(), datetime.datetime.now()] df1 = pd.DataFrame({'a': [0], 'b': [datetime.datetime.now()]}...
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14,180
DOC: clarify dangers of fast apply in GroupBy apply docs
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2016-09-07T22:48:20Z
2021-05-01T23:39:07Z
null
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I recently had to solve an issue where some code was behaving inconsistently. Effectively, I tracked this issue to a function that was being passed to apply which occasionally, under certain circumstances, mutated the input for a group - and not always the first group. Because fast_apply only checks the first group thi...
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MAINT: Use __module__ in _DeprecatedModule.
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2016-09-08T03:44:04Z
2016-09-14T08:31:15Z
2016-09-14T08:31:04Z
MEMBER
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Follow-up to #14105. Uses the `__module__` method to correctly determine the location of the alternative module to use.
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14,182
BUG: fix str.contains for series containing only nan values
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2016-09-08T09:54:44Z
2016-09-09T22:29:29Z
2016-09-09T22:29:16Z
CONTRIBUTOR
null
- [x] closes #14171 - [x] tests added / passed - [x] passes `git diff upstream/master | flake8 --diff` - [x] whatsnew entry
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14,183
TST: failing tests at pandas-wheels
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8
2016-09-08T10:56:21Z
2017-03-22T11:53:46Z
2017-03-22T11:53:46Z
MEMBER
null
A bunch of tests are failing in the wheel-building repo (https://github.com/MacPython/pandas-wheels): https://travis-ci.org/MacPython/pandas-wheels/builds/158414872 It are mainly issues with 32 bit linux (see eg https://travis-ci.org/MacPython/pandas-wheels/jobs/158414875), but also some tests are failing for 64bit: ...
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14,184
ENH: Added multicolumn/multirow support for latex
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2016-09-08T12:14:10Z
2017-03-03T09:17:22Z
2017-03-03T09:16:46Z
NONE
null
- [x] closes #13508 - [X] tests added / passed - [X] passes `git diff upstream/master | flake8 --diff` - [X] whatsnew entry Print names of MultiIndex columns. Added "multicol" and "multirow" flags to to_latex which trigger the corresponding feature. Multirow adds clines to visually separate sections.
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DOC: minor typo in 0.19.0 whatsnew file
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2016-09-08T14:36:38Z
2016-09-08T15:02:19Z
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groupby TimeStamp bug
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2016-09-08T20:47:06Z
2016-09-08T22:12:00Z
2016-09-08T22:11:44Z
NONE
null
#### Code Sample, a copy-pastable example if possible ``` x = pd.DataFrame(index = [1,1,2,2,2], data = pd.date_range("7:00", "9:00", freq="30min", tz = 'US/Eastern')) x: 1 2016-09-08 07:00:00-04:00 1 2016-09-08 07:30:00-04:00 2 2016-09-08 08:00:00-04:00 2 2016-09-08 08:30:00-04:00 2 2016-09-08 09:00:00-04:00 In [59...
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14,187
date_range produces wrong values when overflowing
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2016-09-08T22:15:00Z
2018-10-28T03:14:14Z
2018-10-28T03:14:14Z
MEMBER
null
In the following case, you now get a RuntimeWarning. But shouldn't we rather error on this? ``` In [23]: pd.date_range('1/1/2000', periods=100000, freq='D') /home/joris/scipy/pandas/pandas/tseries/index.py:1944: RuntimeWarning: overflow encountered in long_scalars e = b + np.int64(periods) * stride /home/joris/scipy...
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reindex(fill_value=None) fills with np.NaN instead of None
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2016-09-08T22:47:30Z
2016-09-09T10:14:33Z
2016-09-09T00:55:57Z
NONE
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#### Code Sample, a copy-pastable example if possible ``` python In [12]: import pandas as pd In [13]: s = pd.Series(['a', 'b']) In [14]: s.reindex([0,1,2], fill_value=None) Out[14]: 0 a 1 b 2 NaN dtype: object ``` #### Expected Output ``` python 0 a 1 b 2 None dtype: object ``` #### outp...
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14,189
Pandas inplace argument is not explicit True or False
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2016-09-08T23:36:01Z
2017-01-06T12:33:21Z
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NONE
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Any Serie or DataFrame method with arguments inplace != [0, False, None, [], {}] process inplace operation. Is not explicit True or False like in the documentation. Other methods tested: where, mask, sort_index Any bool(arg) == True is accepted Like: inplace='Fail' , inplace=3, inplace=[0] Maybe is not a bug, but can...
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BUG: Categorical constructor is not idempotent with datetime with tz
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2016-09-08T23:51:56Z
2016-09-09T19:33:37Z
2016-09-09T19:33:37Z
CONTRIBUTOR
null
This isn't a huge deal, but popped up adding tests for #14173 Works fine with plain datetimes ``` In [9]: dti = pd.date_range('2014-01-01', '2014-01-05') In [10]: pd.Categorical(pd.Categorical(dti)) Out[10]: [2014-01-01, 2014-01-02, 2014-01-03, 2014-01-04, 2014-01-05] Categories (5, datetime64[ns]): [2014-01-01, 20...
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BUG: Categorical constructor not idempotent with ext dtype
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CONTRIBUTOR
null
- [x] closes #14190 - [ ] tests added / passed - [x] passes `git diff upstream/master | flake8 --diff` - [x] whatsnew entry
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14,192
TST: Difference in drop_duplicates for numeric Series and DataFrames
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2016-09-09T13:54:12Z
2016-12-15T09:02:51Z
2016-12-15T09:02:51Z
NONE
null
#### Code Sample ``` import pandas as pd import numpy as np df = pd.DataFrame({'a':[1,1,1,'one', 'one'], 'b': [2,2,np.nan, np.nan, np.nan], 'c': [3,3,np.nan, np.nan, 'three'] }) print df[['b']].drop_duplicates() print df['b'].drop_duplicates() ``` #### Expecte...
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14,193
Kernel dies when exporting large dataframe to json
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2016-09-09T19:29:23Z
2016-09-09T19:29:13Z
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### Problem The kernel dies when I try to export relatively large data to json. No problems with short test data, it gets exported as it should. Also, exporting a large df to_csv works just fine, but to_json fails. These are datasets of either tweets or newspaper articles, so at least one of the fields contains strin...
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14,194
ENH: DataFrame.style option for hiding the index
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2016-09-09T17:56:31Z
2017-11-19T16:15:34Z
2017-11-19T16:15:34Z
CONTRIBUTOR
null
#### Code Sample, a copy-pastable example if possible ``` python df = pd.DataFrame(np.random.randn(10, 2)) df.style.set_include_index(False) # name TBD ``` #### Expected Output Same output, but without the index Would maybe want a way to hide the columns too. --- Current workaround ``` python df = pd.DataFrame(n...
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14,195
Re: DataFrame.to_csv(quoting=csv.QUOTE_NONNUMERIC) quotes numeric values
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2016-09-09T20:27:20Z
2016-10-06T16:04:57Z
2016-10-06T16:04:57Z
NONE
null
As per the issue outlined in #12922, applying a float_format or having a NaN value with a float would continue to treat the value as non-numeric when quoting=csv.QUOTE_NONNUMERIC is used. The format string resulting in the float treated like a string should be documented as per @jreback in #12922.
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14,196
Fix minor spacing issue
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4
2016-09-10T02:34:40Z
2016-10-27T14:54:07Z
2016-10-27T14:54:00Z
NONE
null
Continuation of #13350 - [x] closes #13032 - [ ] tests added / passed - [x] passes `pep8radius master --diff` - [x] whatsnew entry - not necessary See https://github.com/pydata/pandas/pull/13350 for more details, mucked up my pull request. Tests will need a lot of work.
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BUG: numpy RuntimeWarning with Series.round()
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2016-09-10T09:07:48Z
2019-02-27T14:40:33Z
2019-02-27T14:40:33Z
CONTRIBUTOR
null
Maybe needs wrapping in `numpy.errstate` (in pandas)? ``` python >>> import pandas as pd >>> pd.__version__ u'0.19.0rc1' >>> pd.Series([pd.np.nan]).round() Warning (from warnings module): File "C:\Program Files\Python27\lib\site-packages\pandas\core\series.py", line 1340 result = _values_from_object(self).round...
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Fix: F999 dictionary key '2000q4' repeated with different values
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2016-09-10T13:15:18Z
2016-09-10T19:00:13Z
2016-09-10T19:00:13Z
CONTRIBUTOR
null
Removal of duplicate line to fix lint error ``` pandas/tseries/tests/test_tslib.py:685:18: F999 dictionary key '2000q4' repeated with different values pandas/tseries/tests/test_tslib.py:690:18: F999 dictionary key '2000q4' repeated with different values ```
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BUG: union_categorical with Series and cat idx
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2016-09-10T13:31:36Z
2016-09-10T14:30:49Z
2016-09-10T14:30:49Z
CONTRIBUTOR
null
- [x] closes #14173 - [ ] tests added / passed - [x] passes `git diff upstream/master | flake8 --diff` - [x] whatsnew entry (not needed)
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DOC: add source links to api docs
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2016-09-10T14:42:28Z
2016-09-12T07:57:46Z
2016-09-12T07:57:26Z
CONTRIBUTOR
null
- [x] closes #14178 - [x] tests not needed - [x] passes `git diff upstream/master | flake8 --diff` - [x] whatsnew not needed cc @jorisvandenbossche - like you mentioned, this doesn't work for everything (properties, accessors, some generated methods)
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14,201
retrieving dataframe from HDFStore: row index "nan" incorrectly becomes NaN
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2016-09-11T00:09:33Z
2016-09-12T13:15:27Z
2016-09-11T13:58:37Z
NONE
null
Retrieving a dataframe previously stored in a HDFStore with a row label "nan" (string) is incorrectly retrieved as NaN. My blog talks more about this issue: [http://makeyourowntextminingtoolkit.blogspot.co.uk/2016/09/pandas-dataframe-hdfstore-bug.html](http://makeyourowntextminingtoolkit.blogspot.co.uk/2016/09/pandas-...
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https://api.github.com/repos/pandas-dev/pandas/issues/14202
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176,252,026
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14,202
In gbq.to_gbq allow the DataFrame column order to differ from schema
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5
2016-09-11T16:31:45Z
2016-09-13T10:24:04Z
2016-09-13T10:24:03Z
CONTRIBUTOR
null
- [x] closes #11359 - [x] tests added / passed. [Link to Travis-CI build with my gbq credentials](https://travis-ci.org/parthea/pandas/builds/159134242) - [x] passes `git diff upstream/master | flake8 --diff` - [x] whatsnew entry
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176,255,736
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14,203
BUG: Accept column indices for na_values in read_csv
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1
2016-09-11T17:54:38Z
2016-12-16T23:32:49Z
2016-12-16T23:32:48Z
MEMBER
null
``` python >>> from pandas.compat import StringIO >>> from pandas import read_csv >>> data = 'a\nfoo\n1' >>> >>> read_csv(StringIO(data), na_values={0: 'foo'}, engine='c') ... TypeError: Expected list, got set >>> read_csv(StringIO(data), na_values={0: 'foo'}, engine='python') a 0 foo # Should be NaN ...
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https://api.github.com/repos/pandas-dev/pandas/issues/14204
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14,204
pandas-0.19.0rc1: 'global name tempita is not defined'
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15
2016-09-11T23:32:41Z
2016-10-24T22:24:19Z
2016-10-24T22:24:18Z
NONE
null
![screen shot 2016-09-11 at 4 27 54 pm](https://cloud.githubusercontent.com/assets/6101444/18421326/c789182c-783c-11e6-8120-e33a450e85be.png) I am running a Travis CI build in a python 2.7 min environment. Not sure why it is pulling from an unreleased version of pandas but it looks like the tempita needs to be importe...
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176,344,670
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14,205
Datatype of Integer changes depending on indexing method on a dataframe with an integer and a float column
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1
2016-09-12T10:39:36Z
2016-09-12T10:52:09Z
2016-09-12T10:52:09Z
NONE
null
Take a dataframe that has one integer and one float column, then use various methods to get the first integer element. In certain cases the datatype will be given back correctly as int64, in other cases however it's changed to float64. Indexing using ix even does both, depending on how it is used: ``` import pandas as...
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176,419,658
MDU6SXNzdWUxNzY0MTk2NTg=
14,206
pandas.DataFrame.unstack() documentation example has errors
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3
2016-09-12T16:21:40Z
2016-09-13T23:00:15Z
2016-09-13T23:00:15Z
NONE
null
The last part of the documentation says ``` python >>> df = s.unstack(level=0) >>> df.unstack() one a 1. b 3. two a 2. b 4. ``` although we'd have ``` python >>> import pandas as pd >>> index = pd.MultiIndex.from_tuples([('one', 'a'), ('one', 'b'), ... ('two', 'a')...
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176,445,314
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14,207
API: allow dependent assignment?
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19
2016-09-12T18:14:26Z
2018-02-10T16:20:18Z
2018-02-10T16:20:18Z
CONTRIBUTOR
null
Since kwarg order will be [guaranteed](https://docs.python.org/3.6/whatsnew/3.6.html#pep-468-preserving-keyword-argument-order) in python 3.6, we could allow this...though would only want to try with a 3.6+ version check, otherwise code could more or less randomly work/not work, depending on dict order. ``` python In ...
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