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https://api.github.com/repos/pandas-dev/pandas/issues/5401
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21,926,076
MDU6SXNzdWUyMTkyNjA3Ng==
5,401
ENH: cross join in merge() and join()
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42
2013-10-31T20:53:13Z
2020-11-26T00:31:47Z
2020-11-26T00:31:47Z
CONTRIBUTOR
null
related here: https://github.com/pydata/pandas/issues/7203 If I haven't missed something, there's no simple way to make [cartesian product](http://pandas.pydata.org/pandas-docs/stable/merging.html#brief-primer-on-merge-methods-relational-algebra) method in pandas. For example, see http://stackoverflow.com/questions/19...
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21,929,013
MDU6SXNzdWUyMTkyOTAxMw==
5,402
BUG/Not Implemented Panel.to_frame() with MultiIndex
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8
2013-10-31T21:41:07Z
2014-01-15T16:12:41Z
2014-01-15T16:12:41Z
CONTRIBUTOR
null
Should this be doable? ``` python In [39]: df = pd.DataFrame({'A': [1, 2], 'B': pd.to_datetime(['a', 'b'])}, index=pd.MultiIndex.from_tuples([(1, 'one'), (1, 'two')])) In [40]: df Out[40]: A B 1 one 1 a two 2 b In [41]: wp = pd.Panel({'i1': df, 'i2': df}) In [42]: wp.to_frame() ----...
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21,931,312
MDExOlB1bGxSZXF1ZXN0OTU4MzUyMA==
5,403
CLN: Remove unnecessary ExcelWriterMeta metaclass
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2013-10-31T22:20:02Z
2014-06-30T12:55:30Z
2013-11-01T00:21:36Z
CONTRIBUTOR
null
Only `__new__` is really necessary. And subclasses just have to deal with being passed an 'engine' keyword argument + a tad bit of style cleanup. Thanks to @jseabold and @josef-pkt for making me realize that this was unnecessary in https://github.com/statsmodels/statsmodels/issues/1167 :) @jmcnamara - this has comple...
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21,931,427
MDU6SXNzdWUyMTkzMTQyNw==
5,404
html parsing with phantomjs?
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11
2013-10-31T22:22:25Z
2014-01-01T02:43:06Z
2014-01-01T02:43:06Z
CONTRIBUTOR
null
I was looking into expanding the pandas.io.data functionality to read options data from Google Finance. After reading http://pandas.pydata.org/pandas-docs/stable/gotchas.html#html-gotchas I tried various combinations for parsing http://www.google.com/finance/option_chain?q=GOOG without success. The page formats its...
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21,941,416
MDExOlB1bGxSZXF1ZXN0OTU4ODg2NQ==
5,405
Fix Issues with FY5253 and nearest w/ year end in Dec
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14
2013-11-01T03:52:05Z
2014-07-04T19:06:17Z
2013-11-07T21:58:18Z
CONTRIBUTOR
null
There are currently some issues with FY5253 working with `variation="nearest"` and `startingMonth=12`. This PR fixes those issues and add some more tests.
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21,944,427
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5,406
Implement center=True for rolling_corr_pairwise
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3
2013-11-01T06:46:39Z
2014-06-19T04:37:08Z
2014-06-19T04:37:08Z
CONTRIBUTOR
null
The computational tool `rolling_corr` in `pandas.stats.moments` has the very useful `center=True` parameter. Can we have it for `rolling_corr_pairwise` as well?
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5,407
BUG: period indexing via [] for label indexingshould return partial ranges
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0
2013-11-01T16:37:12Z
2014-05-18T16:56:27Z
2014-05-18T16:56:27Z
CONTRIBUTOR
null
http://stackoverflow.com/questions/19730653/slicing-on-a-perod-index-in-pandas-when-slice-start-and-end-may-be-out-of-bounds/19731145#19731145
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21,984,163
MDExOlB1bGxSZXF1ZXN0OTYxMjI5NQ==
5,408
DOC/BUG: fix details for 'quoting' parser parameter
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2013-11-01T21:00:49Z
2014-06-19T13:22:40Z
2014-01-21T11:46:04Z
CONTRIBUTOR
null
``` python Python 2.7.5 (default, May 15 2013, 22:44:16) [MSC v.1500 64 bit (AMD64)] on win32 Type "help", "copyright", "credits" or "license" for more information. Imported NumPy 1.7.1, SciPy 0.12.0, Matplotlib 1.3.0 + guidata 1.6.1, guiqwt 2.3.1 Type "scientific" for more details. >>> from csv import QUOTE_MINIMAL, ...
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5,409
BLD: plot failures in master
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2013-11-01T21:18:25Z
2013-11-01T22:13:32Z
2013-11-01T22:13:32Z
CONTRIBUTOR
null
This started after I merged #5375 (which passed cleanly before merging) https://travis-ci.org/pydata/pandas/jobs/13376953
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5,410
pd.to_timedelta(single_string) returns a Series, which ruins broadcasting.
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7
2013-11-01T22:12:36Z
2013-11-04T21:19:02Z
2013-11-04T21:19:02Z
CONTRIBUTOR
null
Currently ``` In [10]: pd.to_timedelta(Series(['00:03:37', '00:05:05'])) - pd.to_timedelta('00:03:00') Out[10]: 0 00:00:37 1 NaT dtype: timedelta64[ns] ``` because ``` In [13]: pd.to_timedelta('00:03:00') Out[13]: 0 00:03:00 dtype: timedelta64[ns] ``` More expected and consistent behavior, in my opinio...
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21,987,758
MDExOlB1bGxSZXF1ZXN0OTYxNDQ1Mw==
5,411
BLD: dateutil-2.2 patch
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0
2013-11-01T22:13:26Z
2014-07-16T08:38:35Z
2013-11-01T22:13:32Z
CONTRIBUTOR
null
close #5409
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21,988,342
MDU6SXNzdWUyMTk4ODM0Mg==
5,412
Support numpy 1.8
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7
2013-11-01T22:26:35Z
2013-11-02T23:54:38Z
2013-11-02T23:54:38Z
CONTRIBUTOR
null
Numpy 1.8 was released recently - https://github.com/numpy/numpy/blob/master/doc/release/1.8.0-notes.rst We should probably support it and add/change a Travis build for it. Additionally, might be interesting to benchmark numpy's nanmean, nanvar and nanstd against pandas versions... numpy also notes that they are plan...
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5,413
BLD: numpy 1.8 on the 3.3/2.7 builds
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3
2013-11-01T22:51:05Z
2014-06-23T21:43:09Z
2013-11-02T23:54:38Z
CONTRIBUTOR
null
close #5412 still pretty good coverage of all numpys build take a tad longer w/o the wheels
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5,414
ENH/BUG: pass formatting params thru to `to_csv`
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2013-11-02T01:32:10Z
2014-06-14T17:02:45Z
2014-02-17T14:19:06Z
CONTRIBUTOR
null
Add support for passing remaining `csv.writer` formatting parameters thru to `DataFrame.to_csv()`. Maybe write tests for this? That much is over my head currently.
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5,415
BUG: to_timedelta of a scalar returns a scalar, closes #5410.
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2013-11-02T12:55:39Z
2014-06-20T16:34:01Z
2013-11-04T21:19:02Z
CONTRIBUTOR
null
closes #5410
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5,416
io.html.read_html support XPath expressions for table selection
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2013-11-02T19:15:04Z
2014-07-19T02:25:03Z
2014-01-01T03:01:53Z
CONTRIBUTOR
null
First tentative PR as discussed in #5389
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22,007,939
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5,417
BUG: Panel.to_frame() with MultiIndex major axis
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2013-11-02T19:37:15Z
2014-06-14T22:38:45Z
2014-01-15T16:12:41Z
CONTRIBUTOR
null
Closes #5402 WIP for now. So this is a hack to get things "working". I mainly just wanted to ask if there was a better way to get the levels and labels to the MultiIndex constructor. Don't spend long thinking about it (this is my PR after all), but if you know of a quick way off the top of your head, I'd be interest...
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5,418
parse_time_string raises key error for certain frequencies
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2013-11-02T23:51:00Z
2015-07-14T15:52:23Z
2015-07-14T15:52:23Z
CONTRIBUTOR
null
I will fix as part of #5148 For example: ``` parse_time_string('2013Q1', freq="INVLD-L-DEC-SAT") ```
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TST: Use tempfiles in all tests.
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2013-11-03T00:50:08Z
2014-06-26T00:27:11Z
2013-11-03T23:42:17Z
CONTRIBUTOR
null
If you really need to, possible to opt-out with make_tempfile=False. Something weird with HDF where, even though it's _supposed_ to be removing the file every time, it causes issues to use a real temp file... Not sure why (maybe I missed something there).
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BUG: loc should not fallback for integer indexing for multi-index
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2013-11-03T01:42:11Z
2014-06-19T00:29:52Z
2014-06-19T00:29:52Z
CONTRIBUTOR
null
https://groups.google.com/forum/m/#!topic/pydata/W0e3l0UvNwI
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22,021,360
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5,421
DOC/API: provide a doc matrix of all indexing accessors and behaviors
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2013-11-03T15:36:11Z
2018-07-06T23:02:56Z
2018-07-06T23:02:41Z
CONTRIBUTOR
null
related #5420 ML issue: https://groups.google.com/forum/#!topic/pydata/Ke8kntiPHqw existing tests here (and tests/test_frame.py, test_multilevel.py) https://github.com/pydata/pandas/blob/master/pandas/tests/test_indexing.py - create new top-level advanced indexing tab (move hierarchical and sections below here) - add...
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5,422
TST: make pytables tests go thru a temporary dir and file
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2013-11-03T17:26:01Z
2014-07-16T08:38:46Z
2013-11-03T17:44:08Z
CONTRIBUTOR
null
TST/BUG: incorrect way of testing for r+ modes related #5419
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5,423
ENH: Better handling of MultiIndex with Excel
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2013-11-03T20:42:24Z
2014-06-16T22:40:15Z
2013-11-06T01:42:23Z
CONTRIBUTOR
null
Allow optional formatting of MultiIndex and Hierarchical Rows as merged cells. closes #5254. Some notes on this PR: - The required xlsxwriter version was up-revved in `ci/requirements*.txt`to pick up a fix in that module that makes working with charts from pandas easier. - Added a comment to `release.rst`. - Modified ...
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5,424
print df.ix[..,..] changes dataframe?
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2013-11-03T20:58:31Z
2013-11-04T00:40:53Z
2013-11-04T00:40:53Z
CONTRIBUTOR
null
These two codeblocks result in different dataframes: ``` python import pandas as pd import numpy as np cont = ['one', 'two','three', 'four', 'five', 'six', 'seven'] dfb = pd.DataFrame({'a' : cont, "b":cont[3:]+cont[:3] ,'c' : np.arange(7)}) #print dfb.ix[0,"c"] dfb.ix[7,'c'] = 1 print dfb print dfb.ix[7,"c"] print dfb...
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5,425
TST: Use tempfiles in all tests.
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2013-11-03T23:42:01Z
2014-07-16T08:38:56Z
2013-11-04T01:10:47Z
CONTRIBUTOR
null
related #5419 Includes @jreback's commits from #5422 and hdf_temp: - TST: make pytables tests go thru a temporary dir and file - TST/BUG: incorrect way of testing for r+ modes TST: fix temporary files by using mktemp (rather than mkstemp) which opens them
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5,426
BUG: not clearing the cache when reindexing issue when partial setting (GH5424)
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0
2013-11-04T00:13:08Z
2014-06-23T22:17:11Z
2013-11-04T00:40:53Z
CONTRIBUTOR
null
closes #5424
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5,427
BUG: Excel writer doesn't handle "cols" option correctly
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2013-11-04T01:11:18Z
2013-11-06T22:16:21Z
2013-11-06T22:16:21Z
CONTRIBUTOR
null
This is an issue that I introduced when fixing #5235. The `cols` option in `to_excel` no longer works correctly after the fix for the above issue. For example: ``` python import pandas as pd df = pd.DataFrame({'A': ['a', 'a', 'a'], 'B': ['b', 'b', 'b']}) df.to_excel('frame.xlsx', sheet_name='She...
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5,428
ENH: Implement to_json() for Panel
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2013-11-04T01:11:37Z
2018-07-06T20:21:02Z
2017-07-10T21:09:21Z
CONTRIBUTOR
null
related #4889 Currently the to_json() method only works for Series and DataFrame, and raises NotImplementedError when called on Panel. Would be great to implement it for Panel as well. For me it is sufficient to loop through all items and convert each item (DataFrame) to json separately and then stitch them together....
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BUG: Excel writer doesn't handle "cols" option correctly
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2013-11-04T01:38:29Z
2014-07-02T22:44:20Z
2013-11-06T22:16:21Z
CONTRIBUTOR
null
closes #5427 Notes on this PR: - This fix addresses an issue introduced in #5235 (Issue with Excel writers when column names are duplicated). - Basically it needs to handle 2 different use cases: - The user uses duplicate column names - The user specifies a different order via the `cols` option ``` python # Case ...
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5,430
Resampling a Series with a timezone using kind='period' Crashes with ~6000 Values
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23
2013-11-04T02:07:13Z
2013-11-06T01:07:39Z
2013-11-06T00:23:40Z
CONTRIBUTOR
null
I wrote a test case that consistently crashes the entire process. It looks like it requires a Series with data localized to a timezone that has a DST and the data crosses the DST boundary. Finally, you have to use `kind='period'`for the `resample()` operation. Oddly, it's not just the actual boundary, because I can ...
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5,431
Can we use xlrd for all Excel file reading?
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2
2013-11-04T02:41:46Z
2013-11-04T05:13:14Z
2013-11-04T05:12:48Z
MEMBER
null
I see that xlrd now can read xlsx files. Anyone know if it can be a drop-in replacement for our use of openpyxl? https://pypi.python.org/pypi/xlrd/0.9.2
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22,076,313
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5,432
BUG: fix Resampling a Series with a timezone using kind='period' (GH5430)
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3
2013-11-04T20:11:40Z
2014-07-16T08:39:13Z
2013-11-06T00:23:40Z
CONTRIBUTOR
null
There's a failing test case and the patch in subsequent commits. closes #5430 closes #3609
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22,077,870
MDU6SXNzdWUyMjA3Nzg3MA==
5,433
Update PDF documentation to Stable version 0.12.0
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14
2013-11-04T20:37:14Z
2014-01-31T20:43:11Z
2014-01-17T13:37:15Z
NONE
null
This seems to be a very common issue with Python projects (Numpy has the same issue). If you try to download this: http://pandas.pydata.org/pandas-docs/stable/pandas.pdf You'll get the documentation for version 0.11.0 Check the links for the pdf documentation at the main web page here: http://pandas.pydata.org/ The s...
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22,083,098
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5,434
BUG/TST: bug in the test apparatus when dtypes are equal in a Series but the values are not equal
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0
2013-11-04T22:01:12Z
2014-07-11T22:41:28Z
2013-11-04T22:49:49Z
CONTRIBUTOR
null
noticed in #5429
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22,086,010
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5,435
Add ExcelFile to API docs + clarify ExcelFile isn't deprecated (just moved)
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1
2013-11-04T22:46:06Z
2014-01-28T02:11:13Z
2014-01-28T01:05:02Z
CONTRIBUTOR
null
ExcelFile the class isn't actually in the API anywhere. We should rectify that. Also, I realized from [this SO question on ExcelFile](http://stackoverflow.com/questions/19760741/how-do-you-read-excel-sheets-using-index-instead-of-name-with-pandas-read-excel/19778206) that the release notes aren't explicitly clear that...
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5,436
API: timedelta64[ns] elements operate with timedelta/offsets
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2013-11-04T23:52:29Z
2014-11-26T02:30:02Z
2014-11-26T02:30:02Z
CONTRIBUTOR
null
have to return timedelta64[ns] scalars ``` type: timedelta64[ns] In [23]: s = pd.to_timedelta(np.arange(5),unit='d') In [24]: s Out[24]: 0 00:00:00 1 1 days, 00:00:00 2 2 days, 00:00:00 3 3 days, 00:00:00 4 4 days, 00:00:00 dtype: timedelta64[ns] In [25]: s + timedelta(hours=1) Out[25]: 0 ...
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5,437
BUG: pd.to_timedelta raises instead of returning NaT
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2013-11-05T01:28:24Z
2013-11-06T23:51:20Z
2013-11-06T23:51:20Z
CONTRIBUTOR
null
``` In [1]: Series(['2011-01-01', np.nan]).apply(pd.to_datetime) Out[1]: 0 2011-01-01 00:00:00 1 NaT dtype: datetime64[ns] In [2]: Series(['00:00:01', np.nan]).apply(pd.to_timedelta) AssertionError: Invalid type for timedelta scalar: <type 'float'> ``` May not be a trivial fix. So far I have seen...
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5,438
BUG: pd.to_timedelta handles missing data
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20
2013-11-05T03:27:15Z
2014-06-24T21:15:32Z
2013-11-06T23:51:20Z
CONTRIBUTOR
null
closes #5437 **Updated**: Mostly following @jreback's suggestion, but we need `np.timedelta64('NaT')`, not `pd.tslib.iNaT`, because numpy cannot cast `np.datetime64('NaT')` as `np.timedelta64` type, and throws an `AssertionError`. ``` In [1]: pd.to_timedelta(Series(['00:00:01', '00:00:02'])) Out[1]: 0 00:00:01 1 ...
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ENH: Always do true division on Python 2.X
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2014-06-23T22:30:35Z
2013-11-05T22:53:10Z
CONTRIBUTOR
null
Close #5356. Note: this version actually forces `a / b` to always do truediv as well. It's less complicated to maintain if we do it that way, but it's also possible to have this `a / b` use div and `a.div(b)` use truediv, just might be strange. This is definitely different from numpy behavior. We also may need to add...
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22,116,607
MDU6SXNzdWUyMjExNjYwNw==
5,440
resampling closed='left' incorrect ?
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3
2013-11-05T12:31:45Z
2021-04-11T03:49:51Z
null
NONE
null
Hi, Coming back to issue #2665, I'm still not convinced that the closed-argument of the resampling function does what it should. When resampling daily to monthly values with closed = 'left', the closed argument should relate to the actual time the months change, but instead it seems to refer to the time 24 hours ...
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22,124,146
MDU6SXNzdWUyMjEyNDE0Ng==
5,441
HDFStore.select slowed by decode even when using columns=
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6
2013-11-05T14:45:22Z
2013-11-06T15:22:59Z
2013-11-06T13:59:15Z
CONTRIBUTOR
null
I realized when profiling a slow select (200% more wall-time as direct pytables call and high memory usage) that most of the time is spend inside bytes.decode called by [_unconvert_strings_array](https://github.com/pydata/pandas/blob/master/pandas/io/pytables.py#L3966), even when selecting only int64 columns. It seems...
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22,131,111
MDU6SXNzdWUyMjEzMTExMQ==
5,442
Provide 'Rolling' data structures
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2013-11-05T16:16:29Z
2016-05-04T13:04:00Z
2016-05-04T13:04:00Z
NONE
null
In our project Zipline, https://github.com/quantopian/zipline/, we consume time series data one bar at a time. We provide support for calculations that are performed over a fixed length, e.g. over the last 15 days of data. The data which those calculations are performed over are updated with the most recent bar as it c...
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5,443
BUG: isnull of an object array failing when NaT
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2013-11-05T19:07:26Z
2014-01-23T03:55:50Z
2014-01-06T23:44:29Z
CONTRIBUTOR
null
``` In [1]: pd.isnull(np.array([pd.NaT])) Out[1]: array([False], dtype=bool) ``` this should be true
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22,153,673
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5,444
Panel4D can not be saved to hdf using the .to_hdf call
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9
2013-11-05T21:46:03Z
2014-02-14T17:06:30Z
2013-11-05T22:07:54Z
NONE
null
``` import pandas as pd, numpy print pd.__version__ with pd.get_store('test.h5') as store: df = pd.Panel4D(data=numpy.random.randn(2,3,4,5)) store.append('test',df) print store df.to_hdf('test2.h5','test') ``` Output: ``` 0.12.0 <class 'pandas.io.pytables.HDFStore'> File path: test.h5 /test wide_t...
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5,445
Use future division import in all files.
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2013-11-05T22:57:26Z
2017-06-01T20:13:30Z
2017-06-01T20:13:30Z
CONTRIBUTOR
null
Now that all division on NDFrame is truediv, we should add the division future import to most/all files (alongside print) to avoid any inconsistencies. At least on the pure Python parts. Nor sure about Cython.
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22,168,859
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5,446
PERF/ENH: Use xlsxwriter by default (and then fall back on openpyxl).
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2013-11-06T02:34:52Z
2014-07-16T08:39:26Z
2013-11-07T03:23:10Z
CONTRIBUTOR
null
Since xlsxwriter has a smaller install base (because it's newer), reasonable to assume that if you have it installed, you want xlsxwriter. Plus, it has better performance characteristics in general (esp. in terms of memory usage)
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5,447
DOC: fix build error in to_latex and release notes
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2013-11-06T10:25:16Z
2014-07-16T08:39:27Z
2013-11-06T12:58:55Z
MEMBER
null
This partly fixes #5331 (the `to_latex` part, not the 'Malformed table' one). And in the same time, fixes a build error in the newly added docs on `truediv` in the release notes.
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5,448
PERF: Fixed decoding perf issue on py3 (GH5441)
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2013-11-06T12:39:07Z
2014-06-16T19:05:47Z
2013-11-06T13:59:15Z
CONTRIBUTOR
null
closes #5441
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5,449
BUG: dup columns in to_excel when writing
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2013-11-06T13:34:03Z
2013-11-06T13:52:27Z
2013-11-06T13:52:27Z
CONTRIBUTOR
null
@jtratner , cc @jmcnamara pretty sure this is fixed with xlsxwriter...maybe need a warning with other writers? http://stackoverflow.com/questions/19812934/pandas-dataframe-concat-and-to-excel-output
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5,450
DOC: remove docstring of flags attribute during doc building process (#5331)
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1
2013-11-06T14:05:13Z
2014-07-09T18:47:42Z
2013-11-06T15:31:36Z
MEMBER
null
Further fixes #5331 with @jtratner 's suggestion (https://github.com/pydata/pandas/issues/5142#issuecomment-27871973). This removes the docstring of all attributes with the name `flags` during the doc building process.
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22,197,254
MDU6SXNzdWUyMjE5NzI1NA==
5,451
Simple way of adding/removing column to DataFrame Not in Place
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17
2013-11-06T14:26:25Z
2016-07-27T11:06:51Z
2016-07-27T11:06:51Z
CONTRIBUTOR
null
See SO question: http://stackoverflow.com/questions/19802708/add-column-to-pandas-dataframe-not-in-place I would suggest something like: ``` df_new = df.alter(new_col_name=existing_series) ``` where alter would wake one or more columns: ``` df_new = df.alter( new_col_name1=existing_series1, new_col_name2=existing...
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22,197,938
MDExOlB1bGxSZXF1ZXN0OTcxOTgzNA==
5,452
add optional default value to GroupBy.get_group
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2013-11-06T14:38:00Z
2015-01-18T21:39:57Z
2015-01-18T21:39:57Z
CONTRIBUTOR
null
I've used a try except block as opposed to and if else (below) to keep the non-default code path fast. What I didn't do: ``` if default is None : inds = self.indices[name] else : inds = self.indices.get(name, default) ``` Here is an example use case: ``` def foo(df, keys) : g = df.groupby('key') for...
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5,453
Matplotlib cursor position wrong after using asfreq method to change freq of DateTimeIndex from None to something
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2013-11-06T15:15:53Z
2014-06-12T21:07:21Z
2014-05-01T17:50:35Z
CONTRIBUTOR
null
After using the `asfreq` method to change the frequency of a time-series DataFrame from `None` to something e.g. `15Min` the cursor position in matplotlib graphs of that DataFrame is no longer correct (usually shows a datetime just after the unix epoch). The following demonstrates this (NB dt in df1 is not a constant)...
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22,205,858
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5,454
DOC: small error in cookbook (doc build warning)
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2013-11-06T16:23:22Z
2014-07-16T08:39:33Z
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5,455
Allow labels argument to DataFrame.drop to be a function
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2013-11-06T17:05:22Z
2013-11-06T23:58:23Z
2013-11-06T23:58:23Z
CONTRIBUTOR
null
Allow `labels` to be a function that is applied to each label on the `axis` and return `True` if that label is to be dropped. For example: ``` df = pd.DataFrame({'a':[1],'B':[2],'c':[3]}) df.drop(labels=lambda x:x.lower()==x, axis=1) ``` would drop columns 'a' and 'c' This would be consistent with `DataFrame.rename...
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22,226,881
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5,456
DOC: update groupby NA group handing / workaround
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5
2013-11-06T21:32:28Z
2019-10-21T19:52:14Z
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Add more explicit docs / work-around for dealing with groupby and NA groups (see comments) Changelog: 07.Nov.2013: Add line to example below to preprocess table content. I expect the following behavior: A `DataFrame.groupby` splits the dataframe/table into subtables according to the grouping-condition. A column name...
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22,230,021
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5,457
CLN: use fast pathed config lookup in pandas code.
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1
2013-11-06T22:22:46Z
2013-11-21T13:29:16Z
2013-11-21T13:29:16Z
CONTRIBUTOR
null
@jreback is about to introduce this with the warn on setting with copy PR. We should use it in pandas internals - will be cleaner, especially when debugging. https://github.com/pydata/pandas/commit/7aa7880f#diff-1e746a348e7db9596f3d053134d00e74R515
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5,458
BUG: Series.apply(to_timedelta) returns object-type Series.
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2013-11-06T23:30:00Z
2014-02-04T15:53:19Z
2014-01-20T23:37:17Z
CONTRIBUTOR
null
_For later (post 0.13)..._ Good: ``` In [1]: Series(['2013-01-05']).apply(pd.to_datetime) Out[1]: 0 2013-01-05 00:00:00 dtype: datetime64[ns] ``` Bad: ``` In [2]: Series(['00:00:01']).apply(pd.to_timedelta) Out[2]: 0 1000000000 nanoseconds dtype: object ``` This problem turned up in #5438 , resovling #5437 . ...
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5,459
DOC: add basic documentation to some of the GroupBy properties and methods
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2013-11-07T01:45:06Z
2014-06-14T22:38:30Z
2013-11-27T20:00:21Z
CONTRIBUTOR
null
I added some simple documentation to the GroupBy and Grouper classes
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5,460
DOC: Clarify 'public-ish' API for packages using pandas.
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6
2013-11-07T02:12:35Z
2021-04-11T03:52:44Z
2021-04-11T03:52:44Z
CONTRIBUTOR
null
I've been contributing a little bit to GeoPandas / working on some of my own custom code using pandas that I want to share with others and I realized that I wasn't sure what is and is not part of the public API for pandas. Here's what I have in my head: Definitely public: - anything in pandas toplevel namespace (exce...
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22,241,197
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5,461
DatetimeIndex.normalize doesn't clear ns field
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10
2013-11-07T02:48:08Z
2013-11-08T12:46:51Z
2013-11-08T12:46:51Z
NONE
null
``` import pandas as pd import numpy as np didx = pd.DatetimeIndex(np.array([1380585623454345752, 1380585612343234312]).astype("datetime64[ns]")) didx.normalize() ``` the output is: ``` <class 'pandas.tseries.index.DatetimeIndex'> [2013-10-01 00:00:00.000000752, 2013-10-01 00:00:00.000000312] Length: 2, Freq: None, T...
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5,462
PERF: performance improvements on isnull/notnull for large pandas objects
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0
2013-11-07T13:06:16Z
2014-07-16T08:39:41Z
2013-11-07T14:44:58Z
CONTRIBUTOR
null
``` In [1]: df = DataFrame(np.random.randn(1000,1000)) In [2]: %timeit df.apply(pd.isnull) 10 loops, best of 3: 121 ms per loop In [3]: %timeit pd.isnull(df) 100 loops, best of 3: 3.15 ms per loop ``` from 0.12 ``` In [2]: %timeit df.apply(pd.isnull) 10 loops, best of 3: 74.3 ms per loop In [3]: %timeit pd.isnull(...
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5,463
PyTables: invalid combinate of [values_axes] on appending data
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2013-11-07T19:32:25Z
2013-11-08T01:02:41Z
2013-11-08T00:43:23Z
NONE
null
I got the following error when appending data to an HDF5 file: > File "/opt/epd/7.3-2_pandas0.11/lib/python2.7/site-packages/pandas/io/pytables.py", line 610, in append > self._write_to_group(key, value, table=True, append=True, *_kwargs) > File "/opt/epd/7.3-2_pandas0.11/lib/python2.7/site-packages/pandas/io/p...
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5,464
Error setting locale in test suite
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2013-11-08T02:07:55Z
2013-11-08T18:19:17Z
2013-11-08T18:19:17Z
CONTRIBUTOR
null
This is on the VM running pandas windows builds. Windows XP Python 2.7 32-bit ``` ERROR: test suite for <class 'pandas.io.tests.test_data.TestGoogle'> ---------------------------------------------------------------------- Traceback (most recent call last): File "c:\python27\x32\lib\site-packages\nose\suite.py", line...
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5,465
Error in test suite for timedelta operations
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2013-11-08T02:09:25Z
2013-11-08T18:18:25Z
2013-11-08T18:18:25Z
CONTRIBUTOR
null
This is on the VM running pandas windows builds. Windows XP Python 2.7 32-bit numpy 1.7.1 ``` ====================================================================== ERROR: test_timedelta_ops_with_missing_values (pandas.tseries.tests.test_timedeltas.TestTimedeltas) ------------------------------------------------------...
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5,466
Error in test suite for indexing
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2013-11-08T02:11:07Z
2013-11-08T18:19:00Z
2013-11-08T18:18:25Z
CONTRIBUTOR
null
This is on the VM running pandas windows builds. Windows XP Python 2.7 32-bit numpy 1.7.1 ``` ====================================================================== ERROR: test_multiindex_assignment (pandas.tests.test_indexing.TestIndexing) ---------------------------------------------------------------------- Traceba...
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5,467
Error in test suite for eval
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2013-11-08T02:14:43Z
2013-11-08T18:18:25Z
2013-11-08T18:18:25Z
CONTRIBUTOR
null
This is on the VM running pandas windows builds. Windows XP Python 2.7 32-bit numpy 1.7.1 ``` ====================================================================== FAIL: pandas.computation.tests.test_eval.TestAlignment.test_basic_series_frame_alignment('numexpr', 'python') --------------------------------------------...
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5,468
Error in test suite for Series.mode
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2013-11-08T02:16:30Z
2013-11-08T05:01:49Z
2013-11-08T04:48:37Z
CONTRIBUTOR
null
This is on the VM running pandas windows builds. Windows XP Python 2.7 32-bit numpy 1.7.1 ``` ====================================================================== FAIL: test_mode (pandas.tests.test_series.TestSeries) ---------------------------------------------------------------------- Traceback (most recent call l...
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5,469
TST: Fix test case to use int64 and explicit float
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2013-11-08T03:59:58Z
2014-07-16T08:39:46Z
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CONTRIBUTOR
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#5468
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5,470
BUG: SparseDataFrame does not allow single value data
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3
2013-11-08T07:45:06Z
2019-09-18T14:02:17Z
2019-09-18T14:02:17Z
NONE
null
You can create a normal DataFrame with, e.g., `pandas.DataFrame(0, index=[1, 2, 3], columns=["A", "B", "C"])`. However, this fails with a SparseDataFrame: ``` >>> x = pandas.SparseDataFrame(0, index=[1, 2, 3], columns=["A", "B", "C"]) Traceback (most recent call last): File "<pyshell#97>", line 1, in <module> x...
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5,471
BUG: bool(NaT) was True
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2013-11-08T08:52:18Z
2013-11-08T16:51:27Z
2013-11-08T16:51:27Z
CONTRIBUTOR
null
bool(NaT) evaluates to True. I am not sure if this is by design or if it is a bug, but I think it makes more sense to evaluate it to False.
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22,333,055
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5,472
BUG: DatetimeIndex.normalize now accounts for nanoseconds (#5461).
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1
2013-11-08T12:04:03Z
2014-07-15T19:20:42Z
2013-11-08T12:46:21Z
CONTRIBUTOR
null
closes #5461 datetime64(ns) uses the dts->ps which was not being set to zero in the normalize function.
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5,473
Test suite throws lots of DateParseErrors
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11
2013-11-08T15:52:45Z
2013-12-19T04:12:09Z
2013-11-08T16:32:46Z
NONE
null
Hej hej, I built pandas from source on [python 2.7, numpy 1.8, dateutil 2.2] using ``` python setup.py build_ext --inplace ``` When running the test suite, ``` nosetests pandas ``` I encounter lots of DateParseErrors. The error message is basically always the same, so here is an example one: <pre> ===========...
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5,474
TST: win32 fixes
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4
2013-11-08T16:04:19Z
2014-07-16T08:39:49Z
2013-11-08T18:18:25Z
CONTRIBUTOR
null
TST: test_indexing dtype comps, closes #5466 TST don't compare invalid indices in eval operations, closes #5467 TST: invalid assignment for np.timedelta64 closes #5465 TST: skip locale checks on windows cloes #5464 TST: dtype comp issue on windows in test_indexing (GH5466) TST: skip test_pow on windows (GH5467)
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22,365,095
MDU6SXNzdWUyMjM2NTA5NQ==
5,475
missing _is_copy causes strangeness
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3
2013-11-08T21:26:41Z
2013-11-09T01:56:27Z
2013-11-09T01:56:27Z
CONTRIBUTOR
null
Note the duplication of the assignment is not a copy/paste error-- the first one works, the second one fails, presumably because a different path is taken if the column already exists than if it doesn't. ``` >>> pd.__version__ '0.12.0-1081-ge684bdc' >>> df = pd.DataFrame({"A": [1,2]}) >>> df._is_copy False >>> df.to_p...
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5,476
BUG: NaN in DataFame column causes select with condition to always return empty
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6
2013-11-08T22:22:21Z
2013-12-03T10:23:04Z
2013-11-09T01:59:57Z
NONE
null
``` import pandas as pd, numpy r = numpy.array([ [1,2], [2,1], [1,2], [2,1]],dtype=float) r[0,1] = numpy.nan df = pd.DataFrame(data=r,columns=['s1','s2']) print 'Original:' print df print 'Selected:' print df[df.s2==1] # As expected # s1 s2 #1 2 1 #3 2 1 df.to_hdf('float_bug.h5','data',table=True,data_co...
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5,477
API: make sure _is_copy on NDFrame is always available (GH5475)
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0
2013-11-09T01:43:33Z
2014-07-04T19:23:41Z
2013-11-09T01:56:27Z
CONTRIBUTOR
null
closes #5475
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5,478
VIS/ENH Hexbin plot
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2013-11-09T15:31:46Z
2014-06-13T17:02:18Z
2014-02-14T14:46:40Z
CONTRIBUTOR
null
This is just 10 minutes of copy-paste cargo-culting to gauge interest, I haven't tested anything yet. ``` python In [1]: df = pd.DataFrame(np.random.randn(1000, 2)) In [2]: df.plot(kind='hexbin', x=0, y=1) Out[2]: <matplotlib.axes.AxesSubplot at 0x10eb76e10> ``` ![hexbin](https://f.cloud.github.com/assets/1312546/15...
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5,479
Building docs SyntaxError
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2013-11-09T21:37:43Z
2014-01-31T08:02:53Z
2014-01-31T08:02:53Z
CONTRIBUTOR
null
I followed [this](http://pandas.pydata.org/developers.html#contributing-to-the-documentation) advice but on `python make.py html` I get ``` Running Sphinx v1.2b3 Exception occurred while building, starting debugger: Traceback (most recent call last): File "/usr/local/lib/python3.3/site-packages/sphinx/cmdline.py", l...
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BUG: value_counts / shift not in groupby dispatch whitelist (0.12-dev)
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2013-11-10T04:00:11Z
2013-12-28T22:18:05Z
2013-12-07T14:16:56Z
CONTRIBUTOR
null
Copying comment from #4887 to a new issue for discussion purposes: While testing pandas-master, hit a method not in the new groupby dispatch whitelist: `value_counts` (on a `SeriesGroupBy` object). Another possible addition: `shift`, as used in this [SO answer](http://stackoverflow.com/a/17406083/243434). Tried to g...
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PERF: 6x perf hit from using numexpr
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2013-11-10T16:18:17Z
2013-11-10T18:47:39Z
2013-11-10T18:47:39Z
CONTRIBUTOR
null
1 million x 3 dataframe, using numexpr takes 142ms to do multiplication, with numexpr disabled, takes 21.6ms. I'm going to investigate, but would be helpful to know if you can reproduce this anywhere else. ``` In [10]: df = pd.DataFrame({"A": np.arange(1000000), "B": np.arange(1000000, 0, -1), "C": np.random.randn(100...
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PERF: perf regression with mixed-type ops using numexpr (GH5481)
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2013-11-10T17:44:26Z
2014-06-18T10:04:21Z
2013-11-10T18:47:39Z
CONTRIBUTOR
null
closes #5481 BUG: non-unique ops not aligning correctly these are bascially a trivial op in numpy, so numexpr is slightly slower (but the the dtype inference issue is fixed). Essentially the recreation of an int64 ndarray had to check if its a datetime-like. In this case just passing in the dtype on the reconstructed...
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cut with np.inf gives TypeError
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2013-11-10T17:57:53Z
2013-11-10T21:03:30Z
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NONE
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``` python import pandas as pd import numpy as np arr = np.random.randn(20) factor = pd.cut(arr, [-np.inf, 0, np.inf]) ``` gives this error: Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/Users/weitzenfeld/anaconda/lib/python2.7/site-packages/pandas/tools/tile.py", line 102, in cut ...
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PERF: combine ops can be block based
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2013-11-10T18:07:08Z
2018-10-25T03:22:33Z
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CONTRIBUTOR
null
related #5482 / #5481 in theory an op like: `df * df2` can be done block-based rather than column-by-column, so for large numbers of columns would see nice speedups. Though, passing to `pd.eval` is almost always faster because its passed to numexpr (at the cost of an upcasted dtype on the way back) the 2 frames are ...
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PERF: pd.eval when using mixed types
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2013-11-10T18:10:28Z
2021-04-11T03:53:33Z
null
CONTRIBUTOR
null
``` In [11]: df = pd.DataFrame({"A": np.arange(1000000), "B": np.arange(1000000, 0, -1), "C": np.random.randn(1000000)}) In [13]: %timeit pd.eval('df*df') 1 loops, best of 3: 635 ms per loop In [14]: df = df.astype(float) In [15]: %timeit pd.eval('df*df') 100 loops, best of 3: 5.87 ms per loop ``` the time is all i...
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print_versions.py fixes
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2013-11-10T21:48:16Z
2014-07-16T08:40:00Z
2013-11-10T21:48:36Z
NONE
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#4760 #4901 1. Path resolution was broken, so running the script outside the pandas root directory didn't work. 2. The use of `subprocess` to invoke the script from the source tree relied on system python, ignoring the interpreter version actually used to invoke the scripts. Travis was unaffected since the system py...
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5,487
netCDF IO suport
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2015-04-30T06:40:27Z
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I'd like to propose `read_netcdf` ([netCDF (Network Common Data Format)](http://www.unidata.ucar.edu/software/netcdf/)) a new Pandas I/O api feature with a similar top level interface as the other reader functions. This format is widely used in the scientific community. Furthermore, netCDF4 is implemented on top of ...
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Code Examples in Docs are not Valid Python3
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2013-11-10T22:45:37Z
2014-02-14T08:38:26Z
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CONTRIBUTOR
null
For example here, http://pandas.pydata.org/pandas-docs/stable/io.html#yahoo-finance: ``` end = datetime.datetime(2013, 01, 27) ``` the `01` int literal is not valid python3.
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ENH: allow plotting libraries to easily hook into pandas
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2013-11-10T23:42:26Z
2014-01-25T19:57:57Z
2014-01-25T19:55:51Z
CONTRIBUTOR
null
At PyData I was introduced to this great library that wraps matplotlib called [prettyplotlib](https://github.com/olgabot/prettyplotlib) by @olgabot and it was used to good effect in @twiecki's presentation on PyMC3. I want to incorporate this into pandas - it would be a great improvement and a light dep for the libra...
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PERF: speed up pd.to_datetime and co. by extracting dt format from data and using strptime to parse
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14
2013-11-11T07:46:16Z
2014-02-14T13:11:12Z
2014-01-24T21:49:48Z
CONTRIBUTOR
null
I had a series containing strings like these: "November 1, 2013" Series length was about 500,000 A) running pd.to_datetime(s) takes just over a minute. B) running pd.to_datetime(s, format="%B %d, %Y") takes about 7 seconds! My suggestion is a way to make case A (where user doesn't specify the format type) take abou...
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22,447,122
MDU6SXNzdWUyMjQ0NzEyMg==
5,491
Inconsistency between min and max in apply with multiindex
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5
2013-11-11T13:07:13Z
2013-11-27T18:37:54Z
2013-11-27T18:37:54Z
NONE
null
I have noticed an inconsistency between the min and max functions when using an apply between levels of a multiindex dataframe. Please see the console log below, and notice the Series return type in the case of the min function and scalar return type for the max function. ``` >>> df = pd.DataFrame({'A': [1, -1, 2, -2]...
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22,454,456
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5,492
ENH: accept mutliple series for FRED DataReader
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3
2013-11-11T15:22:23Z
2014-07-16T08:40:03Z
2013-11-27T18:31:21Z
CONTRIBUTOR
null
closes #3413 Let me know if you want this for .13 or .14 and I'll fill in the release notes appropriately.
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22,466,812
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5,493
groupby apply does not work if single value for groupby key
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2
2013-11-11T18:29:30Z
2013-12-05T23:37:23Z
2013-12-05T23:37:15Z
NONE
null
The following groupby fails if key1 contains only a single value. I am using pandas 12 and python 3.x This works: import pandas as pd import numpy as np df = pd.DataFrame({'key1': ['a','a','n','a', 'a'], 'data1': np.random.randn(5), 'data2': np.random.randn(5)}) def x(df): ...
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22,468,657
MDU6SXNzdWUyMjQ2ODY1Nw==
5,494
ENH: make contiguous groupby easier
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5
2013-11-11T19:00:23Z
2018-07-06T22:34:47Z
2018-07-06T22:34:37Z
CONTRIBUTOR
null
`itertools.groupby` groups things contiguously-- great for run length encoding, not so great for partitioning. This necessitates the `groupby(sorted(items,key=keyfn), keyfn)` dance if you want to separate it. That's not always what you want either, so you wind up writing ``` def partition(seq, keyfn): d = {} ...
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22,504,009
MDU6SXNzdWUyMjUwNDAwOQ==
5,495
Empty version number, when downloading pandas as zip archive
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1
2013-11-12T08:25:07Z
2014-01-07T18:59:02Z
2013-12-30T20:55:38Z
NONE
null
When you download the current master as zip archive from github.com, assigning a version number fails (empty string). As a consequence, packages depending on pandas (e.g. statsmodels) will fail to build as well. I assume, the reason is the following: The version number is determined using git, but since the downloaded ...
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5,496
DateParseError after upgrading matplotlib and others dependancies
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4
2013-11-12T11:36:38Z
2013-11-27T18:36:43Z
2013-11-27T18:36:43Z
NONE
null
Hi all, using pandas 0.12, after upgrading matplotlib from 1.2.0 to 1.3.1, which in turn have upgraded numpy python-dateutil tornado pyparsing nose six, I can't now slice a datetime based dataframe: In [16]: pm Out[16]: <class 'pandas.core.frame.DataFrame'> DatetimeIndex: 1584 entries, 2013-09-01 00:00:00 to 2013-11-0...
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22,519,675
MDU6SXNzdWUyMjUxOTY3NQ==
5,497
scatter_matrix: coordinate misalignment among diagonal and off-diagonal plots
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3
2013-11-12T13:56:37Z
2014-01-21T13:30:59Z
2014-01-21T13:30:59Z
CONTRIBUTOR
null
I make extensive use of `scatter_matrix` and I find misalignments in the coordinates of the scatter plots (off-diagonal) and the histograms (on-diagonal) which seem undesirable to me. Consider the picture ![example](https://f.cloud.github.com/assets/2300692/1522061/389753b0-4ba1-11e3-97f0-31caab31fcb7.png) ). In thi...
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5,498
PERF: msgpack encoding changes to use to/from string for speed boosts
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7
2013-11-12T15:39:50Z
2021-10-26T16:20:50Z
2013-11-13T14:13:45Z
CONTRIBUTOR
null
API: disable sparse structure encodings and unicode indexes ``` ------------------------------------------------------------------------------- Test name | head[ms] | base[ms] | ratio | ------------------------------------------------------------------------------- packers_read_pa...
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API/ENH: pass thru store creation arguments for HDFStore; can be used to support in-memory stores
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5,500
read_csv() & EOF character in string cause parsing issue
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2013-11-12T17:51:22Z
2018-11-06T14:17:52Z
2016-08-22T13:11:30Z
NONE
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While importing large text files using read_csv we occasionally get an EOF (End of File ) character within a string, which causes an exception: "Error tokenizing data. C error: EOF inside string starting at line. 844863" . This occurs even with "error_bad_lines = False".. Further, the line stated in the error messag...
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