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https://api.github.com/repos/pandas-dev/pandas/issues/4101
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https://github.com/pandas-dev/pandas/pull/4101
16,252,746
MDExOlB1bGxSZXF1ZXN0NjY3MDI0Ng==
4,101
pep8 cleanup
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[]
closed
false
null
[]
null
1
2013-07-02T08:15:53Z
2013-10-02T21:04:21Z
2013-07-20T20:14:47Z
NONE
null
Minor pep8 cleanup.
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https://api.github.com/repos/pandas-dev/pandas/issues/4102
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16,269,326
MDU6SXNzdWUxNjI2OTMyNg==
4,102
histogram layout keyword should work with the by argument
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1
2013-07-02T15:19:45Z
2013-07-25T13:33:03Z
2013-07-25T13:33:03Z
MEMBER
null
cc @danbirken
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16,270,550
MDU6SXNzdWUxNjI3MDU1MA==
4,103
DataFrame.hist by should take a string that can refer to a column in the calling instance when the column argument is passed
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closed
false
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2
2013-07-02T15:41:12Z
2014-01-29T04:16:44Z
2014-01-29T04:16:44Z
MEMBER
null
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16,271,663
MDExOlB1bGxSZXF1ZXN0NjY4MDU0MQ==
4,104
ENH: allow layout for grouped DataFrame histograms
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[]
closed
false
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10
2013-07-02T15:59:06Z
2014-06-27T11:41:44Z
2013-07-25T13:33:03Z
MEMBER
null
Also remove the slow decorator for tests that take < 100 ms time closes #4102. closes #4194.
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16,272,952
MDExOlB1bGxSZXF1ZXN0NjY4MTIxNw==
4,105
ENH: allow hist to take a string "by" argument
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4
2013-07-02T16:23:21Z
2013-09-27T21:32:37Z
2013-09-27T21:32:37Z
MEMBER
null
closes #4103.
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16,279,033
MDExOlB1bGxSZXF1ZXN0NjY4NDQ0NA==
4,106
ENH: add dropna argument to pivot_table
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17
2013-07-02T18:16:57Z
2014-07-16T08:17:15Z
2013-07-10T13:20:05Z
CONTRIBUTOR
null
fixes #3820 ``` a = np.array(['foo', 'foo', 'foo', 'bar', 'bar', 'foo', 'foo'], dtype=object) b = np.array(['one', 'one', 'two', 'one', 'two', 'two', 'two'], dtype=object) c = np.array(['dull', 'dull', 'dull', 'dull', 'dull', 'shiny', 'shiny'], dtype=object) In [11]: pd.crosstab(a, [b, c], rownames=['a'], colnames=['b', 'c'], drop_na=False) Out[11]: b one two c dull shiny dull shiny a bar 1 0 1 0 foo 2 0 1 2 ``` Also same argument for `pivot_table`.
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16,292,570
MDU6SXNzdWUxNjI5MjU3MA==
4,107
more descriptive error message when assigning dataframe with different index shape to column
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2
2013-07-02T22:47:36Z
2013-07-03T00:04:38Z
2013-07-03T00:04:38Z
CONTRIBUTOR
null
http://stackoverflow.com/questions/17432944/python-pandas-error-when-doing-groupby-counts The below example doesn't make sense, but perhaps the error message could be clearer... ``` df = pd.DataFrame(np.random.randint(0,2,(4,4)), columns=['a', 'b', 'c', 'd']) In [11]: df Out[11]: a b c d gr 0 0 1 1 0 1 1 1 1 1 0 1 2 0 1 1 0 1 3 1 1 0 1 0 In [12]: df.groupby(['b', 'c']).count() Out[12]: a b c d gr b c 1 0 1 1 1 1 1 1 3 3 3 3 3 df['gr'] = df.groupby(['b', 'c']).count() --------------------------------------------------------------------------- ValueError: Buffer dtype mismatch, expected 'Python object' but got 'long' ```
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4,108
ERROR: better error message reporting on inserting incompatible column to frame (GH4107)
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0
2013-07-02T23:31:31Z
2014-07-16T08:17:18Z
2013-07-03T00:04:38Z
CONTRIBUTOR
null
closes #4107
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4,109
BUG: Maybe a Bug with BQuarterEnd
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1
2013-07-03T02:08:07Z
2014-03-30T15:14:50Z
2014-03-30T15:14:50Z
NONE
null
prob related to #4069 import pandas as pd from pandas.tseries.offsets import * help(BQuarterEnd) Help on class BQuarterEnd in module pandas.tseries.offsets: class BQuarterEnd(DateOffset, CacheableOffset) | DateOffset increments between business Quarter dates | startingMonth = 1 corresponds to dates like 1/31/2007, 4/30/2007, ... | startingMonth = 2 corresponds to dates like 2/28/2007, 5/31/2007, ... | startingMonth = 3 corresponds to dates like 3/30/2007, 6/29/2007, ... | | Method resolution order: | BQuarterEnd | DateOffset | CacheableOffset | **builtin**.object | | Methods defined here: | | **init**(self, n=1, **kwds) import datetime as dt d = dt.datetime(2008, 8, 18) dw = d+ BQuarterEnd(1) dw Out[10]: datetime.datetime(2008, 9, 30, 0, 0) dw = d+ BQuarterEnd(1,2) --- TypeError Traceback (most recent call last) <ipython-input-8-2f6514a26e56> in <module>() ----> 1 dw = d+ BQuarterEnd(1,2) TypeError: **init**() takes at most 2 arguments (3 given) I am looking for Business quarter end which end APR, and MAY deflaut is JUN, or those three month cycles...
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BUG: in io.sql.write_frame (replace)
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2013-07-03T02:08:25Z
2014-01-29T20:26:50Z
2014-01-29T20:26:50Z
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From http://pandas.pydata.org/pandas-docs/dev/generated/pandas.io.sql.write_frame.html : ``` Parameters: (...) if_exists: {‘fail’, ‘replace’, ‘append’}, default ‘fail’ : fail: If table exists, do nothing. replace: If table exists, drop it, recreate it, and insert data. append: If table exists, insert data. Create if does not exist. ``` Everything works fine as long as the table does not exist. If table already exists : ``` Python sql.write_frame(sp5002, name="sp500", con=conn, if_exists='replace') ``` -> "sqlite3.OperationalError: no such table: sp500" Reason is that there is no new "create" statement after the drop statement: ``` Python create = None if exists and if_exists == 'replace': create = "DROP TABLE %s" % name elif not exists: create = get_schema(frame, name, flavor) ``` In my opinion it should be changed to something like: (?) ``` Python create = None if exists and if_exists == 'replace': create = "DROP TABLE %s" % name + "\n"+get_schema(frame, name, flavor) elif not exists: create = get_schema(frame, name, flavor) ``` If i manually work around that, everything works as expected: ``` Python exists = sql.table_exists('sp500', conn, 'sqlite') if not exists: sql.write_frame(sp5002, name="sp500", con=conn, if_exists='replace') else: create = "DROP TABLE sp500" cur = conn.cursor() cur.execute(create) cur.close() sql.write_frame(sp5002, name="sp500", con=conn, if_exists='replace') ``` #2971
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CLN: use how="all" in data.py so that things that are not nan in other columns are kept
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BUG: double figure when passing by to Series.hist
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BUG: make sure fig is not doubled when passing by to series.hist
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closes #4112.
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4,114
CLN/TST: cleanup exception message testing by replacing with assertRaisesRegexp
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2014-07-16T08:17:25Z
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.
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BUG: DataFrame.replace is broken in 0.12-dev
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18
2013-07-03T15:35:54Z
2016-10-12T23:03:57Z
2013-07-03T18:59:42Z
CONTRIBUTOR
null
the `DataFrame.replace` seems to be broken in 0.12 development version this code: ``` df = pd.DataFrame({'Type':['Q','T','Q','Q','T'], 'tmp':2}) print df print df.replace({'Type': {'Q': 0, 'T': 1}}) ``` Return correct result in 0.11.0: ``` Type tmp 0 Q 2 1 T 2 2 Q 2 3 Q 2 4 T 2 5 T 2 Type tmp 0 0 2 1 1 2 2 0 2 3 0 2 4 1 2 5 1 2 ``` and in 0.12.0.dev-795004d it does not work: ``` Type tmp 0 Q 2 1 T 2 2 Q 2 3 Q 2 4 T 2 5 T 2 Type tmp 0 0 2 1 1 2 2 0 2 3 1 2 4 0 2 5 1 2 ``` Series.replace it works well, so the workaround for this bug is the following: ``` df['Type'] = df['Type'].replace({'Q': 0, 'T': 1}) ```
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2013-07-03T15:38:24Z
2014-02-13T23:12:31Z
2014-02-13T23:12:31Z
CONTRIBUTOR
null
http://stackoverflow.com/questions/17451843/copying-a-single-index-dataframe-into-a-multiindex-dataframe/17452237#17452237 ``` IIn [3]: import itertools In [4]: inner = ('a','b') In [5]: outer = ((10,20), (1,2)) In [6]: cols = ('one','two','three','four') In [7]: sngl = pd.DataFrame(np.random.randn(2,4), index=inner, columns=cols) IIn [8]: index_tups = list(itertools.product(*(outer + (inner,)))) In [9]: index_mult = pd.MultiIndex.from_tuples(index_tups) In [10]: mult = pd.DataFrame(index=index_mult, columns=cols) ``` and the solution ``` In [48]: nm = mult.reset_index().set_index('level_2') In [49]: nm Out[49]: level_0 level_1 one two three four level_2 a 10 1 NaN NaN NaN NaN b 10 1 NaN NaN NaN NaN a 10 2 NaN NaN NaN NaN b 10 2 NaN NaN NaN NaN a 20 1 NaN NaN NaN NaN b 20 1 NaN NaN NaN NaN a 20 2 NaN NaN NaN NaN b 20 2 NaN NaN NaN NaN ``` A bug here???? This should probably work with a series on the rhs; this might be a buglet ``` In [50]: nm.loc['a',sngl.columns] = sngl.loc['a'].values In [51]: nm Out[51]: level_0 level_1 one two three four level_2 a 10 1 0.3738456 -0.2261926 -1.205177 0.08448757 b 10 1 NaN NaN NaN NaN a 10 2 0.3738456 -0.2261926 -1.205177 0.08448757 b 10 2 NaN NaN NaN NaN a 20 1 0.3738456 -0.2261926 -1.205177 0.08448757 b 20 1 NaN NaN NaN NaN a 20 2 0.3738456 -0.2261926 -1.205177 0.08448757 b 20 2 NaN NaN NaN NaN In [52]: nm.reset_index().set_index(['level_0','level_1','level_2']) Out[52]: one two three four level_0 level_1 level_2 10 1 a 0.3738456 -0.2261926 -1.205177 0.08448757 b NaN NaN NaN NaN 2 a 0.3738456 -0.2261926 -1.205177 0.08448757 b NaN NaN NaN NaN 20 1 a 0.3738456 -0.2261926 -1.205177 0.08448757 b NaN NaN NaN NaN 2 a 0.3738456 -0.2261926 -1.205177 0.08448757 b NaN NaN NaN NaN ```
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BUG: fix replace bug when a nested dict was passed
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2014-07-16T08:17:27Z
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MEMBER
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closes #4115.
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ENH: unify the replace API
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9
2013-07-03T16:22:02Z
2013-09-27T03:25:34Z
2013-09-27T03:25:34Z
MEMBER
null
Currently `DataFrame` and `Series` do slightly different things when their respective `replace` methods are called and accept slightly different arguments. This should be rectified in 0.13.
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16,340,917
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4,119
convert_object not converting to NaN
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0
2013-07-03T21:05:14Z
2013-07-03T23:43:15Z
2013-07-03T23:43:15Z
CONTRIBUTOR
null
docstring seem to suggest that this ought to convert to NaN: ``` In [10]: s = pd.Series([1, 'na', 3 ,4]) In [11]: s.convert_objects(convert_numeric=True) Out[11]: 0 1 1 na 2 3 3 4 dtype: object ``` Docstring: ``` convert_numeric : boolean, default True if True attempt to coerce to numbers (including strings), non-convertibles get NaN ``` However, does work if the non-strings are stringified first ``` In [142]: pd.Series([1, 'na', 3 ,4]).astype(str).convert_objects(convert_numeric=True) Out[142]: 0 1 1 NaN 2 3 3 4 dtype: float64 ```
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4,120
BUG: GH4119 Fixed bug in convert_objects(convert_numeric=True) where a mixed numeric and object not converting
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0
2013-07-03T21:37:43Z
2014-07-16T08:17:29Z
2013-07-03T23:43:15Z
CONTRIBUTOR
null
closes #4119
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4,121
TST: plotting failing tests
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7
2013-07-03T23:06:45Z
2013-07-03T23:14:19Z
2013-07-03T23:14:19Z
CONTRIBUTOR
null
just failed under 2.7 & 3.3 unrelated to my PR https://travis-ci.org/jreback/pandas/jobs/8716024
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16,348,865
MDU6SXNzdWUxNjM0ODg2NQ==
4,122
windows build test failures
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9
2013-07-04T01:46:08Z
2013-07-04T16:05:03Z
2013-07-04T15:11:52Z
CONTRIBUTOR
null
getting test failures on the windows builds. this is from py27 64-bit: ``` ====================================================================== ERROR: test_replace_convert (pandas.tests.test_frame.TestDataFrame) ---------------------------------------------------------------------- Traceback (most recent call last): File "C:\workspace\pandas-windows-test64-py27\pandas\tests\test_frame.py", line 6869, in test_replace_convert assert_series_equal(expec, res) File "C:\workspace\pandas-windows-test64-py27\pandas\util\testing.py", line 197, in assert_series_equal assert_almost_equal(left.values, right.values, check_less_precise) File "C:\workspace\pandas-windows-test64-py27\pandas\util\testing.py", line 141, in assert_almost_equal assert_almost_equal(a[i], b[i], check_less_precise) File "C:\workspace\pandas-windows-test64-py27\pandas\util\testing.py", line 146, in assert_almost_equal if isnull(a): File "C:\workspace\pandas-windows-test64-py27\pandas\core\common.py", line 60, in isnull return _isnull(obj) File "C:\workspace\pandas-windows-test64-py27\pandas\core\common.py", line 74, in _isnull_new return _isnull_ndarraylike(obj) File "C:\workspace\pandas-windows-test64-py27\pandas\core\common.py", line 135, in _isnull_ndarraylike values = np.asarray(obj) File "c:\python27\lib\site-packages\numpy\core\numeric.py", line 235, in asarray return array(a, dtype, copy=False, order=order) ValueError: invalid __array_struct__ ====================================================================== FAIL: test_insert_column_bug_4032 (pandas.tests.test_frame.TestDataFrame) ---------------------------------------------------------------------- Traceback (most recent call last): File "C:\workspace\pandas-windows-test64-py27\pandas\tests\test_frame.py", line 10084, in test_insert_column_bug_4032 assert_frame_equal(result,expected) File "C:\workspace\pandas-windows-test64-py27\pandas\util\testing.py", line 238, in assert_frame_equal check_less_precise=check_less_precise) File "C:\workspace\pandas-windows-test64-py27\pandas\util\testing.py", line 199, in assert_series_equal assert(left.dtype == right.dtype) AssertionError ```
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4,123
BUG/TST: test fixes for windows compat
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2013-07-04T13:25:26Z
2014-06-13T11:22:37Z
2013-07-04T15:11:52Z
CONTRIBUTOR
null
closes #4122
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4,124
CLN: Small fix to clean_pyc task
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2013-07-04T14:08:37Z
2014-07-16T08:17:33Z
2013-07-04T16:02:45Z
CONTRIBUTOR
null
The previous `clean_pyc` wasn't actually removing `*.pyc` files - apparently each branch of find needs its own exec (I guess?). Anyways this works now.
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MDU6SXNzdWUxNjM3MTExOQ==
4,125
BUG: indexing with an entire period_index raising
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1
2013-07-04T14:48:14Z
2015-09-09T21:41:02Z
2015-09-09T21:41:01Z
CONTRIBUTOR
null
``` In [57]: pi = pd.period_range('2002-01','2003-12',freq='M') In [58]: pi Out[58]: <class 'pandas.tseries.period.PeriodIndex'> freq: M [2002-01, ..., 2003-12] length: 24 In [59]: p = pd.Panel(randn(24,5,10),items=pi) In [60]: p Out[60]: <class 'pandas.core.panel.Panel'> Dimensions: 24 (items) x 5 (major_axis) x 10 (minor_axis) Items axis: 2002-01 to 2003-12 Major_axis axis: 0 to 4 Minor_axis axis: 0 to 9 ``` This is ok ``` In [61]: p.ix[list(pi)] Out[61]: <class 'pandas.core.panel.Panel'> Dimensions: 24 (items) x 5 (major_axis) x 10 (minor_axis) Items axis: 2002-01 to 2003-12 Major_axis axis: 0 to 4 Minor_axis axis: 0 to 9 ``` This raises? ``` In [62]: p.ix[pi] DateParseError: day is out of range for month ```
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4,126
ENH: change Index unique to return an Index/MultiIndex (rather than ndarray)
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0
2013-07-04T15:05:42Z
2016-06-08T12:36:32Z
2016-06-08T11:04:50Z
CONTRIBUTOR
null
Change `unique` to return an Index/MultiIndex as needed (rather than an ndarray) ``` In [81]: tuples = [(0, 100, 1000),(0, 100, 1001),(0, 100, 1002), (1, 101, 1001)] In [82]: index_3levels=pd.MultiIndex.from_tuples(tuples,names=["l1","l2","l3"]) In [83]: index_3levels Out[83]: MultiIndex [(0, 100, 1000), (0, 100, 1001), (0, 100, 1002), (1, 101, 1001)] In [84]: index_3levels.droplevel('l3') Out[84]: MultiIndex [(0, 100), (0, 100), (0, 100), (1, 101)] ``` This becomes more intuitive (or maybe add `uniquify` keyword to droplevel? ``` In [85]: MultiIndex.from_tuples(index_3levels.droplevel('l3').unique()) Out[85]: MultiIndex [(0, 100), (1, 101)] ```
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4,127
fix typo - change conn to con
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6
2013-07-04T16:33:39Z
2014-07-16T08:17:34Z
2013-07-05T13:01:31Z
CONTRIBUTOR
null
Noticed a typo in the documentation of `write_frame`. Method def has `con` while documentation had `conn`. `def write_frame(frame, name, con, flavor='sqlite', if_exists='fail', **kwargs):`
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4,128
BLD: use wheel packages to reduce travis-ci build times.
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2
2013-07-04T23:24:22Z
2014-07-16T08:17:35Z
2013-07-04T23:34:56Z
NONE
null
Roughly from 40 minutes to 13 minutes. Before: https://travis-ci.org/pydata/pandas/builds/8738816 After: https://travis-ci.org/y-p/pandas/builds/8749214 The existing build cache system for 2to3 and cythonized caching can knock this down much more, but it's more fragile and part of the reason the previous attempt ultimately failed. Really need to do that in a jenkins server somewhere , if at all. There's no opt-in/whitelist anymore. faster for everyone. The building of the dependencies (a rare occurence) is automated in a provisioning script for vagrant under ci/speedpack. should just be 'vagrant up' and step away for an hour. The package files are hosted on a private openshift server but if a bus hits me it's all here for someone to plunk down a static file webserver somewhere and tweak the url. In case this goes bad and I'm not around to notice, there's one line to comment in ci/install.sh. cc @jreback @cpcloud enjoy.
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4,129
In pandas.DataFrame.to_dict add an option for dict keys to be strings instead of integers
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2013-07-05T10:14:44Z
2013-07-05T10:54:12Z
2013-07-05T10:54:12Z
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to_dict is an ideal option for exporting data to json format. Unfortunately, python "json" (json.dumps) package doesn't accept keys as integers, it expects strings only and throws TypeError when it receives anything else. This is trivial to workaround, however in terms of speed, it'd better to have a choice to either have string keys or integers.
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Non-Reducing Return Values in Rolling .apply
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2
2013-07-05T13:08:56Z
2020-10-05T00:10:12Z
null
CONTRIBUTOR
null
related #2813, #4964 (somewhat) At the moment rolling_apply (et al) the passed function has to return a value (unlike apply which can return a Series and overall return a DataFrame). If you could pass it a Series you could, for example, do this: ``` from pandas.core.algorithms import value_counts s = Series([1, 1, 2, 3, 1, 2, 3, 2, 1]) pd.rolling_apply(s, 3, value_counts) ``` from the [mailing list](https://groups.google.com/forum/#!topic/pydata/I7YET3egFtY).
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16,402,744
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4,131
Excel parser cannot change *keep_default_na* value
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3
2013-07-05T13:17:04Z
2013-07-07T04:40:23Z
2013-07-06T04:17:34Z
CONTRIBUTOR
null
The parse method in the ExcelFile class does not pass the argument _keep_default_na_ to the TextParser from pandas.io.parsers. There is no clean way to override the default na values when parsing excel files with the current code. My specific problem involves "NA" as a typical value for "North America" in excel files.
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16,403,131
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4,132
BLD: travis seems to have not installed dateutil on py3.3
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13
2013-07-05T13:27:52Z
2013-07-06T01:17:48Z
2013-07-05T22:38:54Z
CONTRIBUTOR
null
Just to note that this build failed, which is strange since the commit #4127 seems to only change one character in a docstring, I'm assuming it's a travis issue? https://travis-ci.org/pydata/pandas/jobs/8765391
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4,133
Periods not correctly represented in to_excel() with monthly PeriodIndex
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4
2013-07-05T15:10:22Z
2014-01-26T18:58:24Z
2014-01-26T18:58:24Z
CONTRIBUTOR
null
When I have a Panel with a PeriodIndex with `freq="M"` and I use `mypanel.to_excel()`, then the PeriodIndex gets represented as `YYYY-MM-DD` in the output Excel file. I would expect it to be rather `YYYY-MM`. Is this a bug or a feature?
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4,134
API: Series/DTIndex arithmetic with timedeltas and offsets should work the same
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0
2013-07-05T15:47:13Z
2013-10-03T00:31:53Z
2013-08-13T22:19:43Z
CONTRIBUTOR
null
from stack: http://stackoverflow.com/questions/17491446/wrong-result-from-timedelta-operation/17492653#17492653 ``` In [101]: rng = pd.date_range('2013', '2014') In [102]: rng Out[102]: <class 'pandas.tseries.index.DatetimeIndex'> [2013-07-05 00:00:00, ..., 2014-07-05 00:00:00] Length: 366, Freq: D, Timezone: None In [103]: s = pd.Series(rng) ``` These work ``` In [105]: rng - pd.offsets.Hour(1) Out[105]: <class 'pandas.tseries.index.DatetimeIndex'> [2013-07-04 23:00:00, ..., 2014-07-04 23:00:00] Length: 366, Freq: D, Timezone: None In [106]: s - np.timedelta64(100000000) ``` but the other way around doesn't. ``` In [107]: rng - np.timedelta64(100000000) NotImplementedError: In [108]: s - pd.offsets.Hour(1) ValueError: cannot operate on a series with out a rhs of a series/ndarray of type datetime64[ns] or a timedelta ``` cc #3009.
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BUG: np.timedelta64 arithmetic appears buggy
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3
2013-07-05T16:02:40Z
2013-08-13T22:19:43Z
2013-08-13T22:19:43Z
CONTRIBUTOR
null
Buggy timedelta arithmetic with `np.timedelta64` in np 1.7.1 ``` In [41]: s = Series([Timestamp('20130301'),Timestamp('20130228 23:00:00'),Timestamp('20130228 22:00:00'),Timestamp('20130228 21:00:00')]) In [42]: s Out[42]: 0 2013-03-01 00:00:00 1 2013-02-28 23:00:00 2 2013-02-28 22:00:00 3 2013-02-28 21:00:00 dtype: datetime64[ns] In [43]: s + timedelta(hours=1) Out[43]: 0 2013-03-01 01:00:00 1 2013-03-01 00:00:00 2 2013-02-28 23:00:00 3 2013-02-28 22:00:00 dtype: datetime64[ns] ``` Should be the same as above ``` In [45]: s + np.timedelta64(1,'h') Out[45]: 0 2013-03-01 00:00:00.000000001 1 2013-02-28 23:00:00.000000001 2 2013-02-28 22:00:00.000000001 3 2013-02-28 21:00:00.000000001 dtype: datetime64[ns] ```
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4,136
BUG: period idx str map incorrectly returns a str repr of itself when ind.map(str) is called
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2013-07-05T16:07:44Z
2014-06-21T20:41:46Z
2013-07-25T14:11:10Z
MEMBER
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4,137
period and datetime index asobject returns a non-evalable generic index
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2013-07-05T16:19:09Z
2013-08-13T19:32:27Z
2013-08-13T19:32:27Z
MEMBER
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minor issue, but not consistent with other generic index printing
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BUG: series timedelta arithmetic is not being converted to ns with numpy 1.6
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26
2013-07-05T16:55:36Z
2014-06-13T02:24:25Z
2013-08-12T22:45:33Z
MEMBER
null
closes #4135.
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16,411,600
MDExOlB1bGxSZXF1ZXN0Njc1Mjg1MQ==
4,139
BUG: Make ExcelFile.parse pass kwds to TextParser
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7
2013-07-05T17:06:56Z
2014-07-16T08:17:42Z
2013-07-06T13:01:17Z
CONTRIBUTOR
null
Fixes #4131
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4,140
ENH: Google BigQuery IO Module
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136
2013-07-05T18:00:00Z
2014-06-17T19:42:26Z
2013-10-09T00:28:28Z
NONE
null
This module adds Google BigQuery functionality to the pandas project. The work is based on the existing sql.py and ga.py, providing methods to query a BigQuery database and read the results into a pandas DataFrame.
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4,141
BLD: install pip serially
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8
2013-07-05T20:50:54Z
2014-07-16T08:17:43Z
2013-07-05T22:38:54Z
MEMBER
null
closes #4132.
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4,142
BLD: are correct versions of numpy being installed / statsmodel install (wheel issue?)
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64
2013-07-05T22:53:17Z
2016-10-12T23:03:58Z
2013-07-08T04:15:07Z
CONTRIBUTOR
null
numpy 1.6.1 supposed to be installed here ? https://travis-ci.org/pydata/pandas/jobs/8782276 statsmodels not installing https://travis-ci.org/pydata/pandas/jobs/8782274 #4128
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4,143
BLD: add SITE_PKG_DIR back in and fix numpy 1.6.1 install
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5
2013-07-05T23:00:45Z
2013-07-25T03:52:00Z
2013-07-06T02:24:13Z
MEMBER
null
closes #4142 .
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4,144
ENH melt uses column name if available
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7
2013-07-06T00:08:11Z
2014-06-13T05:42:28Z
2013-07-06T13:42:08Z
CONTRIBUTOR
null
Currently melt allows you to manually specify the val_name and var_name, this changes the default behaviour to grab the column name if one is available. ``` In [1]: df = pd.DataFrame({'a': {0: 1.0676829999999999, 1: -1.3214049999999999, 2: -0.80733299999999997}, 'b': {0: -1.110463, 1: 0.36891499999999999, 2: 0.082979999999999998}, 'c': {0: 0.20866999999999999, 1: -1.055342, 2: -0.87336100000000005}}) In [2]: df.columns.name = 'foo' In [3]: df Out[3]: foo a b c 0 1.067683 -1.110463 0.208670 1 -1.321405 0.368915 -1.055342 2 -0.807333 0.082980 -0.873361 In [4]: pd.melt(df) # before this would have columns ['variable', 'value'] Out[4]: foo value 0 a 1.067683 1 a -1.321405 2 a -0.807333 3 b -1.110463 4 b 0.368915 5 b 0.082980 6 c 0.208670 7 c -1.055342 8 c -0.873361 Also, cleaned up all the tests (and added some more) in test_reshape. ```
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4,145
DataFrame MultiIndex column access (and pop)
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7
2013-07-06T11:11:41Z
2013-07-06T13:21:40Z
2013-07-06T13:21:40Z
CONTRIBUTOR
null
Suppose I want to acces a column in df2 (perhaps there is a near way, but I also expect these to work): ``` In [11]: df Out[11]: h1 main h3 sub h5 0 a A 1 A1 1 1 b B 2 B1 2 2 c B 3 A1 3 3 d A 4 B2 4 4 e A 5 B2 5 5 f B 6 A2 6 In [12]: df2 = df.set_index(['main', 'sub']).T.sort_index(1) In [13]: df2 Out[13]: main A B sub A1 B2 B2 A1 A2 B1 h1 a d e c f b h3 1 4 5 3 6 2 h5 1 4 5 3 6 2 ``` I want to access the column `('A', 'A1')`: ``` In [14]: df2.iloc[:, 0] # cheating with iloc In [15]: df2.T.loc[('A', 'A1'), :].iloc[0] # hacky! In [16]: df2.iloc[:, df2.columns.get_loc(('A', 'A1')).start] # very hacky! In [17]: df2[df2.columns[:1]] # returns DataFrame ``` I had assumed/hoped this would work: ``` In [18]: df2[('A', 'A1')] --------------------------------------------------------------------------- AttributeError Traceback (most recent call last) <ipython-input-18-c307c7bb3bb8> in <module>() ----> 1 df2[('A', 'A1')] /Users/234BroadWalk/pandas/pandas/core/frame.pyc in __getitem__(self, key) 1997 return self._getitem_frame(key) 1998 elif isinstance(self.columns, MultiIndex): -> 1999 return self._getitem_multilevel(key) 2000 else: 2001 # get column /Users/234BroadWalk/pandas/pandas/core/frame.pyc in _getitem_multilevel(self, key) 2036 if isinstance(loc, (slice, np.ndarray)): 2037 new_columns = self.columns[loc] -> 2038 result_columns = _maybe_droplevels(new_columns, key) 2039 if self._is_mixed_type: 2040 result = self.reindex(columns=new_columns) /Users/234BroadWalk/pandas/pandas/core/indexing.pyc in _maybe_droplevels(index, key) 1103 if isinstance(key, tuple): 1104 for _ in key: -> 1105 index = index.droplevel(0) 1106 else: 1107 index = index.droplevel(0) AttributeError: 'Index' object has no attribute 'droplevel' In [19]: df2[['A', 'A1']] # interestingly, slightly different error here KeyError: "['A1'] not in index" ``` Also this way is buggy (loses the index)... which is _weird_, separated this part of the issue as #4146: ``` In [21]: df2['A']['A1'] # in master but not in 0.11.0 Out[21]: 0 0 a 1 1 2 1 ``` _pop uses this in it's implementation, so atm it's not possible to pop a MultiIndex._
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4,146
Not duplicates in multiIndex columns with duplicates not indexed properly when selected
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0
2013-07-06T11:39:54Z
2013-07-06T13:28:09Z
2013-07-06T13:27:19Z
CONTRIBUTOR
null
This appears to be a regression since 0.11 in handling duplicates in MultiIndex columns: ``` In [11]: df Out[11]: h1 main h3 sub h5 0 a A 1 A1 1 1 b B 2 B1 2 2 c B 3 A1 3 3 d A 4 B2 4 4 e A 5 B2 5 5 f B 6 A2 6 In [12]: df2 = df.set_index(['main', 'sub']).T.sort_index(1) In [13]: df2 Out[13]: main A B sub A1 B2 B2 A1 A2 B1 h1 a d e c f b h3 1 4 5 3 6 2 h5 1 4 5 3 6 2 ``` If we grab out successively we get an unexpected result for the non-duplicate: ``` In [14]: df2['A'] Out[14]: sub A1 B2 B2 h1 a d e h3 1 4 5 h5 1 4 5 In [15]: df2['A']['B2'] Out[15]: sub B2 B2 h1 d e h3 4 5 h5 4 5 In [16]: df2['A']['A1'] # this worked in 0.11 Out[16]: 0 0 a 1 1 2 1 ``` ``` In [21]: df2['A']['A1'] # pandas 0.11 Out[21]: h1 a h3 1 h5 1 Name: A1, dtype: object ``` _FWIW never like how this can return different a type..._
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4,147
BUG: min on non-numeric data with nans
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26
2013-07-06T12:37:58Z
2020-09-22T00:04:40Z
null
CONTRIBUTOR
null
related #4279 related #5967 Min doesn't seem to work as expected with NaNs and non-numeric data: ``` In [1]: s = pd.Series(['alpha', np.nan, 'charlie', 'delta']) In [2]: s Out[2]: 0 alpha 1 NaN 2 charlie 3 delta dtype: object In [3]: s.min() # by default docstring suggests this should skipnan Out[3]: inf ``` The hack/workaround is to exclude them, perhaps we should special case this in the code: ``` In [4]: s[s.notnull()].min() Out[4]: 'alpha' ``` _From discussion on [this pandas SO question](http://stackoverflow.com/a/17497460/1240268). and I also posted a corresponding numpy issue: https://github.com/numpy/numpy/issues/3508_.
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BUG: (GH4145/4146) Fixed bugs in multi-index selection with column multi index duplicates
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3
2013-07-06T13:03:12Z
2014-06-15T09:47:51Z
2013-07-06T13:21:40Z
CONTRIBUTOR
null
closes #4145, #4146 ``` In [1]: data = """h1 main h3 sub h5 ...: 0 a A 1 A1 1 ...: 1 b B 2 B1 2 ...: 2 c B 3 A1 3 ...: 3 d A 4 B2 4 ...: 4 e A 5 B2 5 ...: 5 f B 6 A2 6""" In [2]: df = pd.read_csv(StringIO(data),sep='\s+',index_col=0) In [3]: df2 = df.set_index(['main', 'sub']).T.sort_index(1) In [4]: df2.loc[:,('A','A1')] Out[4]: main A sub A1 h1 a h3 1 h5 1 In [5]: df2[('A','A1')] Out[5]: main A sub A1 h1 a h3 1 h5 1 In [6]: df2['A']['A1'] Out[6]: A1 h1 a h3 1 h5 1 ``` This should NOT work, as this is tryingo select 2 different columns ('A' is ok, but 'A1' fails which is correct) ``` In [7]: df2[['A','A1']] KeyError: "['A1'] not in index" ``` This is ok though ``` In [8]: df2[[('A','A1')]] Out[8]: main A sub A1 h1 a h3 1 h5 1 ```
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TST: additional test case for GH4146
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2013-07-06T13:27:51Z
2014-07-16T08:17:52Z
2013-07-06T13:43:13Z
CONTRIBUTOR
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ENH: Melt with MultiIndex columns
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62
2013-07-06T17:08:19Z
2014-06-12T13:34:21Z
2013-07-12T13:16:57Z
CONTRIBUTOR
null
No idea if there's actually a market for this, but anyhow: ``` In [1]: df = pd.DataFrame([[ 1.067683, -1.110463, 0.20867 ], [-1.321405, 0.368915, -1.055342], [-0.807333, 0.08298 , -0.873361]]) In [2]: df.columns = [list('ABC'), list('abc')] In [3]: df.columns.names = ['CAP', 'low'] In [4]: df Out[4]: CAP A B C low a b c 0 1.067683 -1.110463 0.208670 1 -1.321405 0.368915 -1.055342 2 -0.807333 0.082980 -0.873361 In [5]: pd.melt(df, col_level=0) Out[5]: CAP value 0 A 1.067683 1 A -1.321405 2 A -0.807333 3 B -1.110463 4 B 0.368915 5 B 0.082980 6 C 0.208670 7 C -1.055342 8 C -0.873361 In [6]: pd.melt(df,) Out[6]: CAP low value 0 A a 1.067683 1 A a -1.321405 2 A a -0.807333 3 B b -1.110463 4 B b 0.368915 5 B b 0.082980 6 C c 0.208670 7 C c -1.055342 8 C c -0.873361 In [7]: df.columns.names = [None, None] In [8]: pd.melt(df,) Out[8]: variable_0 variable_1 value 0 A a 1.067683 1 A a -1.321405 2 A a -0.807333 3 B b -1.110463 4 B b 0.368915 5 B b 0.082980 6 C c 0.208670 7 C c -1.055342 8 C c -0.873361 ``` Also includes fix for `get_level_values` and name attribute. cc #4144
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WPI: Eval with some PyTables support
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2013-07-07T01:42:44Z
2013-07-07T13:41:34Z
2013-07-07T13:41:34Z
CONTRIBUTOR
null
additional commits after @cpcloud eval branch add some support to replace Term expressions in HDFStore with a direct expression parsing e.g. `store.select('columns=A & index>=df.index[0:4]')` in theory should work
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to_datetime parsing bug when using format
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3
2013-07-07T04:07:15Z
2013-07-09T16:59:56Z
2013-07-09T13:10:36Z
CONTRIBUTOR
null
``` python import datetime as dt import pandas as pd val = '01-Apr-2011 00:00:01.978' print 'pandas version:',pd.__version__ print 'Value to parse:',val format = '%d-%b-%Y %H:%M:%S.%f' print 'datetime.strptime :',dt.datetime.strptime(val, format) print 'to_datetime, w/out format:',pd.to_datetime(val) print 'to_datetime, w/ format :', pd.to_datetime(val, format=format) pandas version: 0.12.0.dev-1101391 Value to parse: 01-Apr-2011 00:00:01.978 datetime.strptime : 2011-04-01 00:00:01.978000 to_datetime, w/out format: 2011-04-01 00:00:01.978000 to_datetime, w/ format : 2011-03-31 23:24:13.516352 ```
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13
2013-07-07T04:38:21Z
2014-07-16T08:17:58Z
2013-07-08T04:15:07Z
MEMBER
null
closes #4142. should be able to finish up tomorrow, just need to put things on the server and test
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4,154
DOC: Improve excel docs
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1
2013-07-07T04:40:23Z
2014-07-16T08:18:02Z
2013-07-10T13:09:33Z
CONTRIBUTOR
null
I simply updated the docs to reflect that `xlrd` handles reading of both `.xls` and `.xlsx` files, and I updated docstrings affected functions by #4131 so that their docstrings stand on their own.
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4,155
WIP: use eval expression parsing as replacement for Term in HDFStore
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84
2013-07-07T22:28:00Z
2014-06-22T09:43:11Z
2013-07-08T18:20:41Z
CONTRIBUTOR
null
extension of @cpcloud #4037 allows natural syntax for queries, with in-line variables allowed some examples `"ts>=Timestamp('2012-02-01') & users=['a','b','c']"` `['A > 0']` ``` dates=pd.date_range('20130101',periods=5) 'index>dates' ``` Todos: - [ ] update docs / need new examples - [ ] API changes (disallow dict, and separated expressions) - [ ] tests for `|` and `~` operators, and invalid filter expressions - [ ] code clean up, maybe create new `Expr` base class to opt in/out of allowed operations (e.g. `Numexpr` doesn't want to allow certain operations, but `PyTables` needs them, so maybe define in the base class for simplicity, and just not allow them (checked in `visit`), which right now doesn't allow a `generic_visitor`) - [ ] can `ops.Value` be equiv of `ops.Constant`?
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4,156
Comparison after pd.concat
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2
2013-07-08T03:13:07Z
2013-07-08T22:42:54Z
2013-07-08T22:42:54Z
NONE
null
Hello, I am wondering if the following is considered to be a bug. I have two Series a and b. They are the same. However, after merging with a third Series c, the equality no longer hold. ``` a = {"open": 1, "high": 2, "low": 3, "close": 4, "UpBand": 4, "MidBand":3, "LowBand":5} b = {"low": 3, "close": 4, "open": 1, "high": 2, "LowBand": 5, "MidBand":3, "UpBand": 4} c = {"haha": 5, "hello": 2} t1 = pd.Series(a) t3 = pd.Series(c) t2 = pd.Series(b) t13 = pd.concat([t1, t3]) LowBand 5 MidBand 3 UpBand 4 close 4 high 2 low 3 open 1 haha 5 hello 2 dtype: int64 t32 = pd.concat([t3, t2]) haha 5 hello 2 LowBand 5 MidBand 3 UpBand 4 close 4 high 2 low 3 open 1 dtype: int64 t1 == t2 LowBand True MidBand True UpBand True close True high True low True open True dtype: bool t13 == t32 LowBand True MidBand False UpBand False close False high False low False open False haha False hello False ```
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4,157
DOC: read_clipboard() failed for sphinx in dev-99ae9ce
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22
2013-07-08T08:02:00Z
2013-07-24T20:05:54Z
2013-07-24T20:05:54Z
CONTRIBUTOR
null
See here: http://pandas.pydata.org/pandas-docs/dev/io.html#clipboard and scroll to the clipboard section. Line [1215] with read_clipboard() failed.
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4,158
BUG: DataFrame.to_string() creates extra space for string dtypes
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3
2013-07-08T09:05:18Z
2013-09-28T19:33:55Z
2013-09-28T19:33:55Z
CONTRIBUTOR
null
`pd.__version__` '0.12.0.dev-6a0b9ec' ``` python exdf = pd.DataFrame([["aoe",12,3.14],["qjk",34,5.67]]) exdf.columns = list('abc') #exdf = exdf.reindex(columns=reversed(list('abc'))) def a(inp): return '{:>3s},'.format(inp) def b(inp): return '{:2d},'.format(inp) def c(inp): return '{:3.2f},'.format(inp) print repr(exdf.to_string(formatters={'a':a,'b':b,'c':c}, index=False,header=False)) ``` ' aoe, 12, 3.14,\n qjk, 34, 5.67,' ^^extra space! Note, when you reindex the columns to be the other way around by removing the # in front of the line `exdf = exdf.reindex ...` then you get: '3.14, 12, aoe,\n5.67, 34, qjk,' ^^no extra space! where one can easily see, that usually, as it is correct, the first element in the line does NOT get a space. Therefore I consider this a formatting bug for (string) objects.
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4,159
DOC: width of page (text area) too small and wrong indentation of bullet lists
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7
2013-07-08T11:56:12Z
2013-07-11T11:13:48Z
2013-07-10T18:59:26Z
MEMBER
null
I noticed that the width of the docs (the text area) is set to a certain maximum in the dev/0.12 version, which I think is a good idea! (certain for wide screens). However, I think it is a little bit too small, as illustrated with the figure below: ![pandas-docs](https://f.cloud.github.com/assets/1020496/761081/437e4718-e7c2-11e2-902e-1ae0abd707a8.png) You can see that I have to use the horizontal scrollbar to see the whole code snippet (while it is well within the 80 char limit). This is partly due to the too small width of the text area, but also partly due to a wrong use of indentation in bulleted lists. Lists don't need any indentation, see http://sphinx-doc.org/rest.html. But almost everywhere (at least in the whatsnew of v0.12.0.txt) indentation is used, with the consequence that the lists in the html are over-indented as you can see in the picture. Possible actions to take: - Increase the maximum width a little bit? I think code snippets should certainly be shown in full width without scrollbar. An example of code snippet (without being in a bulleted list) which needs a scrollbar (on my screen): http://pandas.pydata.org/pandas-docs/dev/whatsnew.html#dtypes - Remove the unnecessary indentation in lists, maybe to start with in the whatsnew v0.12.0.txt (and it can be discussed if it also has to be adapted in older files). If you think this is OK, I can submit a PR for this.
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ENH/BUG: Rename of MultiIndex DataFrames does not work
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25
2013-07-08T13:52:55Z
2021-10-29T01:58:26Z
null
NONE
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xref #14139 for empty MI Hi everybody, in the current version renaming of MultiIndex DataFrames does not work. Lets take the following example: ``` import datetime as DT import pandas as pd df = pd.DataFrame({ 'Branch' : 'A A A A A B'.split(), 'Buyer': 'Carl Mark Carl Joe Mark Carl'.split(), 'Quantity': [1,3,5,8,9,3], 'Date' : [ DT.datetime(2013,9,1,13,0), DT.datetime(2013,9,1,13,5), DT.datetime(2013,10,1,20,0), DT.datetime(2013,10,3,10,0), DT.datetime(2013,12,2,12,0), DT.datetime(2013,12,2,14,0), ]}) ``` and the following query: ``` test_df = df[df['Buyer'].isin(['Carl', 'Mark'])].set_index('Buyer', append=True)[['Date']].unstack(['Buyer']) ``` Now, the following renaming does not work ``` test_df.rename(columns={('Date', 'Carl'): 'Carl'}, inplace=True) ``` Thanks in advance Andy
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4,161
TimeGrouper only works properly when using a sorted DateTimeIndex
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3
2013-07-08T17:10:59Z
2014-02-14T03:24:56Z
2014-02-14T03:24:56Z
NONE
null
related SO question http://stackoverflow.com/questions/19636370/dataframe-groupbytimegrouper-d-invalid-length-for-values-or-for-binner/19636874?noredirect=1#comment29155715_19636874 Hi everybody, today I spend the whole afternoon figuring out that TimeGrouper only works properly when using on a sorted(!) DateTimeIndex. If the DateTimeIndex is not sorted, TimeGrouper throws no error (!) but produces corrupt results. I would suggest either to do a sort() call within TimeGrouper or modify it to throw an error message. The fact that it silently produces corrupt results when the DateTimeIndex is not sorted is really disturbing. Sorry, that I cannot add an example for the bug. All simple examples I created worked fine, it seems that this only leads to corrupt results with DataFrames of size 700 and above. Best regards Andy
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closes #3393. cc @jreback # `eval` Roadmap ## PyTables allows natural syntax for queries, with in-line variables allowed some examples `"ts>=Timestamp('2012-02-01') & users=['a','b','c']"` `['A > 0']` ``` dates=pd.date_range('20130101',periods=5) 'index>dates' ``` Todos: - [ ] update docs / need new examples - [ ] API changes (disallow dict, show deprecations for separated expressions) - [ ] tests for `|` and `~` operators, and invalid filter expressions - [ ] code clean up, maybe create new `Expr` base class to opt in/out of allowed operations (e.g. `Numexpr` doesn't want to allow certain operations, but `PyTables` needs them, so maybe define in the base class for simplicity, and just not allow them (checked in `visit`), which right now doesn't allow a `generic_visitor`) - [ ] can `ops.Value` be equiv of `ops.Constant`? ## Documentation - [ ] enhancing performance section - [x] `eval` docstring - [ ] Warn users that this is _not_ a magic bullet - E.g., `x = 3; y = 2; pd.eval('x // y', engine='python')` is 1000 times slower than the same operation in actual Python. ## Engines - [x] python engine for testing (basically a restricted eval, should make sure nothing dangerous a la `eval('os.system("sudo rm -rf /")')`) is possible here - [x] numexpr engine Should python be the default engine for small frames? ## Functions - [x] toplevel `isexpr` - [x] move `eval` to top-level pandas ## Error Handling - [x] syntax error handling - [x] name error handling ## Alignment - Algorithm 1. flatten the tree of terms 2. resolve the variables, special casing only numpy arrays/scalars/single unary operations (probably room for more abstraction here) 3. align by joining on the indices using the current broadcasting behavior 4. update the original namespace with the newly aligned version of the underlying numpy array 5. reconstruct the final object with the aforementioned joined indices and type - [ ] punt to `'python'` engine when a `Series` and `DataFrame` both have `DatetimeIndexes` (I would rather not do this and just enforce the to-be-deprecated index-aligning-if-both-indices-are-datetimeindex behavior) - [ ] `PeriodIndex`es don't work (well, they won't pass my tests) because of a stack overflow bug when joining a `DatetimeIndex` and a `PeriodIndex` (that bug is slated for 0.13, but a design decision needs to be made) - [ ] alignment for `NDFrame` (is this really necessary?) - [x] unary alignment - [x] binary alignment ## Scope - [x] deal with global scoping issues (not sure if this is tested well enough...which means probably not) - [x] allow `Expr` objects to be passed to `eval` (`Expr` will pull in the local and global variables from the calling stack frame) ## Miscellaneous - [ ] replace current `evaluate` function - [ ] `Expr` in `NDFrame.__getitem__` cc @jreback - [x] reconstruct the final object to return the expected output type, e.g., `df + df2` should return a `DataFrame` if `df` and `df2` are both `DataFrame` objects. - [x] change `Expression` to `Expr` - [x] add `truediv` keyword to `Expr`, default to `True` ## Operators - [x] `%` - [x] `**` - [x] unary ops don't play well when they are operands of binary ops ## Tests - [ ] `DatetimeIndex` and `PeriodIndex` objects are untested because of a few join and alignment issues. - [ ] rewrite a few tests in the python evaluator to make sure the `//` operator works as it should (it works, but there may be edge cases that I haven't though of yet) - [ ] `//` `numexpr` only supports scalar evaluation here: variables are not allowed so this will always eval in python space (half-assed it a bit in the tests here need to fix that) - [x] truediv keyword tests - [x] add tests for nans - [x] fix `**` associativity issue in testing ## Near Future - allow `and`, `or` and `not` aliases for the operators `&`, `|` and `~`, respectively - attribute accessing e.g., `df.A` syntax - reductions (`sum` and `prod`) - math ops (sin, cos, tan, sqrt, etc.) ## Far Future - non-python indexing (or just punt to python)
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ENH: sql support
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176
2013-07-08T19:54:20Z
2014-07-23T22:53:35Z
2014-02-08T03:26:32Z
CONTRIBUTOR
null
**UPDATE**: this is continued in #6292 after the refactor based on sqlalchemy. --- This is a central issue to track sql support (migrated from the mysql support ticket - #2482 and #1662). - [x] sqlite - [x] mysql (#2482) - [ ] oracle (not tested, partially working) - [ ] postgres, (partial via #4574) (not tested, some parts possibly working, [SO user suggests it "works"],(http://stackoverflow.com/questions/17156084/unpacking-a-sql-select-into-a-pandas-dataframe/17156233#17156233)) - [ ] ODBC - _any others?_ I think we are agreed we will be moving to use SQLAlchemy, in the hope of comprehensive cross-platform support: - [x] SQLAlchemy (#2717, #191) Todo: - [x] travis should not skip tests (e.g. mysql #4177) - [ ] add `flavor` argument to `read_sql` - [ ] handling no row returns (#3745) - [ ] Specify chunksize (and iterator) for `read_frame` (#2908) - [ ] read and write the index (and multi-index) - [ ] mangle_dup_columns for read_frame (#2738) - [x] bug in write_frame replace (#4110, #2971, PR #4304, #6164) - [ ] option in `config` to specify default engine/connection for SQL (maybe?) - [ ] refactor SQLAlchemy/sqliite tests (@hayd was thinking different flavors could inherit tests from a baseclass, so tests are only flavor explicit if obviously flavor explicit...) Better Dtype coercion: - [ ] infer dtypes more carefully (discussed in #2482) - [ ] NaN/NaT conversions (#2754, #4199, PR #4200) - [ ] `datetime.date` conversions https://groups.google.com/forum/#!topic/pydata/KEBKxj4cWNI - [ ] support encoding #5008 Peformance - [ ] Vbenches! (for various flavors even?) cc @garaud @mangecoeur @danielballan @changhiskhan
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2013-07-08T20:32:22Z
2014-07-14T06:34:32Z
2013-09-16T18:59:14Z
MEMBER
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closes #3393 closes #2560 cc @jreback # `eval` Roadmap ## PyTables allows natural syntax for queries, with in-line variables allowed some examples `"ts>=Timestamp('2012-02-01') & users=['a','b','c']"` `['A > 0']` `'(index>df.index[3] & index<=df.index[6]) | string="bar"'` ``` dates=pd.date_range('20130101',periods=5) 'index>dates' ``` Todos: - [x] Release Notes - [x] v0.13.txt examples (and link to docs) - [x] update docs / need new examples - [x] API changes (disallow dict, show deprecations for separated expressions) - [x] tests for `|` and `~` operators - [x] tests for invalid filter expressions - [x] code clean up, maybe create new `Expr` base class to opt in/out of allowed operations (e.g. `Numexpr` doesn't want to allow certain operations, but `PyTables` needs them, so maybe define in the base class for simplicity, and just not allow them (checked in `visit`), which right now doesn't allow a `generic_visitor`) - [x] can `ops.Value` be equiv of `ops.Constant`? ## `query` method - [x] a few more doc examples - [x] add a section in `query` docstring to show use of `__getitem__` and then add to `indexing.rst` - [x] `query` docstring ## `DataFrame.eval` method - [x] implement query in terms of this - [x] tests ## Documentation - [x] **RELEASE NOTES** - [x] v0.13.txt examples & link to docs - [x] document `in` and `not in` - [x] enhancing performance section - [x] `eval` docstring - [x] Warn users that this is _not_ a magic bullet - E.g., `x = 3; y = 2; pd.eval('x // y', engine='python')` is many times slower than the same operation in actual Python. ## Engines - [x] `python` engine for testing (basically a restricted eval, should make sure nothing dangerous a la `eval('os.system("sudo rm -rf /")')`) is possible here - [x] `numexpr` engine ## Parsers - [x] `python` parser is currrently not failing on complex bool ops involving subscripting like it should (potentially could `eval` the compiled AST instead of dispatching to function calls) - [x] preparse should handle subscripting - [x] `pandas` parser should handle subscripting, i.e., `df.query(...) == pd.eval('df[...]')` - [x] `pandas` parser - [x] `python` parser - [x] `pytables` engine and parser (internal) Should python be the default engine for small frames? ## Functions - [x] toplevel `isexpr` - [x] move `eval` to top-level pandas ## Error Handling - [x] syntax error handling - [x] name error handling - [x] ugly stack overflow when an expression is not in frame...issue with variable resolution in `expr.py`. should fail fast. ## Alignment - Algorithm 1. flatten the tree of terms 2. resolve the variables, special casing only numpy arrays/scalars/single unary operations (probably room for more abstraction here) 3. align by joining on the indices using the current broadcasting behavior 4. update the original namespace with the newly aligned version of the underlying numpy array 5. reconstruct the final object with the aforementioned joined indices and type - [x] unary alignment - [x] binary alignment ## Scope - [x] add `@a` syntax for referencing local variables with the same name as a column - [x] deal with global scoping issues (not sure if this is tested well enough...which means probably not) - [x] allow `Expr` objects to be passed to `eval` (`Expr` will pull in the local and global variables from the calling stack frame) ## Miscellaneous - [x] support for `MultiIndex` queries - [x] **remove instance testing methods once series ndframe is merged** - [x] `str` ops (implemented using `isin`) - [x] basic `Timestamp` and `datetime` functionality - [x] vbench! - [x] single variable or constant evaluation e.g., `pd.eval('1')` or `pd.eval('df')` - [x] reconstruct the final object to return the expected output type, e.g., `df + df2` should return a `DataFrame` if `df` and `df2` are both `DataFrame` objects. - [x] change `Expression` to `Expr` - [x] add `truediv` keyword to `Expr`, default to `True` - [x] allow `and`, `or` and `not` aliases for the operators `&`, `|` and `~`, respectively - [x] chained comparisons - [x] attribute access syntax e.g., `df.A` ## Operators - [x] `%` - [x] `**` - [x] unary ops don't play well when they are operands of binary ops ## Tests - [ ] `PeriodIndex` objects are untested at large (a few scattered tests for basic things) - [x] add tests for strange column names e.g., `df['@awesome_domain']`, `df['df["$10"]']` - [x] Python 3 handles complex scalars differently, so test that - [x] **revert equality testing in `align.py` once #4379 is merged** - [x] boolean ops fail with a `DataFrame` with a `PeriodIndex` in the columns - [x] test alignment of `DatetimeIndex` objects - [x] rewrite a few tests in the python evaluator to make sure the `//` operator works as it should (it works, but there may be edge cases that I haven't though of yet) - [x] `//` `numexpr` only supports scalar evaluation here: variables are not allowed so this will always eval in python space (half-assed it a bit in the tests here need to fix that) - [x] truediv keyword tests - [x] add tests for nans - [x] fix `**` associativity issue in testing ## Syntax (Easier) - [x] handle `in`, `not in` ( ~~was thinking~~ implemented as `a in b` -> `b.isin(a)` and `a not in b` -> `not a in b` -> `~b.isin(a)`) ## Syntax (More difficult) - reductions (`sum` and `prod`) - math ops (sin, cos, tan, sqrt, etc.), i.e., whatever `numexpr` supports - ~~function calls~~ (we're not building a Python interpreter here :wink:) ## Optimizations There's a quite a bit of recursion going on here, where maybe something stack-based might be more efficient. For example, an expression like `df['f in g and a < b < (c ** 2 + b ** 2 - a ** 3) and d in b not in e']` will make 3 recursive calls to eval (not including the top level call). One for the first `in` expression and two for the `in`/`not in` chain. A stack-based implementation of the parser (instead of recursively visiting nodes) could possible shave off a few milliseconds. Not sure if this is worth it though. ## Others - ~~alignment for `NDFrame`~~ #4336 - ~~replace current `evaluate` function~~
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2013-07-08T20:51:57Z
2014-06-17T19:31:27Z
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MEMBER
null
See #4159 This adds a minimum and maximum width of the text area (instead of one fixed value of, at the moment 600px), and I also increased the maximum value (from 600 to 840). I took the values of the standard sphinx docs which are 780-1080 (minus 240 for the sidebar, in the standard sphinx docs the width is defined for the whole body, here only for the main text area)
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4,166
BUG: wrong parsing of microseconds with format arg (#4152)
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16
2013-07-08T21:59:27Z
2014-07-16T08:18:25Z
2013-07-09T13:10:36Z
MEMBER
null
Closes #4152. `fraction` was already in microseconds, so no need to multiply it with 1000000, which caused faulty parsing of dates with microseconds. With this commit I get: ``` pandas version: 0.12.0.dev Value to parse: 01-Apr-2011 00:00:01.978 datetime.strptime : 2011-04-01 00:00:01.978000 to_datetime, w/out format: 2011-04-01 00:00:01.978000 to_datetime, w/ format : 2011-04-01 00:00:01.978000 ``` for ``` import datetime as dt import pandas as pd val = '01-Apr-2011 00:00:01.978' print 'pandas version:',pd.__version__ print 'Value to parse:',val format = '%d-%b-%Y %H:%M:%S.%f' print 'datetime.strptime :',dt.datetime.strptime(val, format) print 'to_datetime, w/out format:',pd.to_datetime(val) print 'to_datetime, w/ format :', pd.to_datetime(val, format=format) ```
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4,167
TST: to_datetime format tests
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2013-07-09T00:34:35Z
2014-07-16T08:18:27Z
2013-07-09T14:49:19Z
CONTRIBUTOR
null
related to #4166
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4,168
BLD: use the wheel url for scikits timeseries
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2013-07-09T01:02:38Z
2014-07-16T08:18:29Z
2013-07-09T14:29:05Z
MEMBER
null
was previously downloading from sourceforge, now uses the wheel
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4,169
Docs behaviour on bad urls
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5
2013-07-09T12:22:15Z
2017-07-09T02:43:10Z
2017-07-09T02:43:06Z
CONTRIBUTOR
null
When hitting a bad url it shows content from [main page](http://pandas.pydata.org/) but loses css. e.g. http://pandas.pydata.org/pandas-docs/dev/foo.html I think these pages link to the old (non-existent) `"_static/pydata.css"` rather than `"_static/nature.css"` (does this come from [here](https://github.com/pydata/pandas-website/blob/4431565525f6002710f68817ac46a910adf67227/conf.py#L109) or [here](https://github.com/pydata/pandas-website/blob/4431565525f6002710f68817ac46a910adf67227/_themes/pydata/theme.conf#L3)?). :S Also, not sure how/where this behaviour is configured (or if it can be), but could be nice if it could show a alert message to say was a bad url, but perhaps that's not possible.
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API: boolean dtype upsets cumsum
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18
2013-07-09T13:33:48Z
2016-10-12T23:03:59Z
2013-08-07T19:17:18Z
CONTRIBUTOR
null
cumsum seems to require skipna=False otherwise it sulks here. (Not investigate which others are also affected, cumprod is though). ``` In [10]: b = pd.Series([False, False, False, True, True, False, False]) In [11]: b Out[11]: 0 False 1 False 2 False 3 True 4 True 5 False 6 False dtype: bool In [12]: b.cumsum() --------------------------------------------------------------------------- ValueError Traceback (most recent call last) <ipython-input-12-f3f684a93525> in <module>() ----> 1 b.cumsum() /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pandas/core/series.pyc in cumsum(self, axis, dtype, out, skipna) 1626 1627 if do_mask: -> 1628 np.putmask(result, mask, pa.NA) 1629 1630 return Series(result, index=self.index) ValueError: cannot convert float NaN to integer In [13]: b.cumsum(skipna=False) Out[13]: 0 0 1 0 2 0 3 1 4 2 5 2 6 2 dtype: int64 ``` If it has nans or you int or object it works as expected: ``` In [21]: b.astype(int).cumsum() In [22]: b.astype(object).cumsum() # False at the beginning is expected In [23]: b.astype(int).astype(object).cumsum() ``` Also, if you try and inset an nan it doesn't work nor raise (!): ``` In [31]: b.loc[0] = np.nan In [32]: b Out[32]: 0 True 1 False 2 False 3 True 4 True 5 False 6 False dtype: bool ```
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4,171
skip_rows not working when reading xls
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2013-07-09T14:19:09Z
2013-07-09T14:20:30Z
2013-07-09T14:20:24Z
CONTRIBUTOR
null
http://stackoverflow.com/questions/17548669/reading-excel-to-a-python-data-frame-starting-from-row-5-and-including-headers/17548864#comment25528356_17548669
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4,172
ENH: Reading xlsm files
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11
2013-07-09T14:24:28Z
2014-01-27T19:36:14Z
2014-01-27T19:36:14Z
CONTRIBUTOR
null
This user on SO was trying to read an xlsm file (apparently it doesn't work): http://stackoverflow.com/questions/17548669/reading-excel-to-a-python-data-frame-starting-from-row-5-and-including-headers apparently it's possible with openpyxl.
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4,173
VIS/API: Unify as much of plotting API (mosty arguments to plotting functions) as possible
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1
2013-07-09T14:33:05Z
2013-07-26T13:40:19Z
2013-07-26T13:40:19Z
MEMBER
null
There's a duplicate plot created when calling `Series.hist` as well as a duplicate plot when calling `groupby.plot` that I think would be fixed by resolving this issue. #4113 #413 #2168
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last failing Yahoo test
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2
2013-07-09T14:46:11Z
2013-07-09T16:24:44Z
2013-07-09T16:24:44Z
MEMBER
null
https://travis-ci.org/pydata/pandas/jobs/8889101 the test errors because two different reads of the same data yield different values...i'm not sure how to test for this since no matter what they should be the same....? thoughts?
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4,175
DOC to_datetime warning about dayfirst strictness
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1
2013-07-09T14:49:40Z
2014-07-16T08:18:31Z
2013-07-09T15:41:56Z
CONTRIBUTOR
null
cc #3341 Doesn't address the issue, but warns users about it in the docstring (it's already got a warning in the docs).
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16,530,797
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4,176
TST: remove double call to yahoo finance
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2
2013-07-09T15:25:25Z
2014-07-16T08:18:32Z
2013-07-09T16:24:44Z
MEMBER
null
closes #4174.
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MDExOlB1bGxSZXF1ZXN0NjgxMDU1OQ==
4,177
TST: Do not skip MySQL tests on Travis.
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8
2013-07-09T16:01:36Z
2014-07-16T08:18:34Z
2013-07-10T18:26:39Z
CONTRIBUTOR
null
A first step for #4163
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16,534,375
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4,178
CLN: write the attributes in a HDFStore as strings
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2013-07-09T16:31:46Z
2014-07-16T08:18:36Z
2013-07-09T17:07:40Z
CONTRIBUTOR
null
These strings are converted to bytes, previously these were written as unicode
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4,179
failing microsecond formatter test
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2013-07-09T16:47:44Z
2013-07-09T17:04:23Z
2013-07-09T17:02:56Z
MEMBER
null
``` FAIL: pandas.tseries.tests.test_timeseries:TestTimeSeries.test_to_datetime_format_microsecond gvim -f +836 pandas/tseries/tests/test_timeseries.py # test_to_datetime_format_microsecond self.assertEqual(result, exp) AssertionError: Timestamp('2011-03-31 23:24:13.516352', tz=None) != datetime.datetime(2011, 4, 1, 0, 0, 1, 978000) 1 test, 1 failure, 0 errors in 0.0s ``` (i changed to `assertEqual`)
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4,180
ENH: drop_level argument for xs
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14
2013-07-09T17:24:54Z
2014-06-14T07:25:56Z
2013-08-27T12:18:58Z
CONTRIBUTOR
null
As discussed [here](http://stackoverflow.com/questions/17552997/how-to-update-a-subset-of-a-multiindexed-pandas-dataframe), xs usually remove the level which you are accessing. This commit allows you to explicitly say you don't want that (and want to keep the same levels in the result). ``` In [4]: df = DataFrame({'day': {0: 'sat', 1: 'sun'}, 'flavour': {0: 'strawberry', 1: 'strawberry'}, 'sales': {0: 10, 1: 12}, 'year': {0: 2008, 1: 2008}}).set_index(['year','flavour','day']) In [5]: df Out[5]: sales year flavour day 2008 strawberry sat 10 sun 12 In [6]: df.xs('sat', level='day') Out[6]: sales year flavour 2008 strawberry 10 In [7]: df.xs('sat', level='day', drop_level=False) Out[7]: sales year flavour day 2008 strawberry sat 10 In [8]: df.xs([2008, 'sat'], level=['year', 'day'], drop_level=False) Out[8]: sales year flavour day 2008 strawberry sat 10 ```
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groupby and np.dot with MultiIndex
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8
2013-07-09T17:51:28Z
2018-07-06T20:21:00Z
2017-07-11T09:59:31Z
CONTRIBUTOR
null
Should the following work? On revision 07403ca. ``` weights = np.random.randn(4,4) panel = pd.util.testing.makePanel(nper=2).to_frame() panel.groupby(level=0).apply(lambda x : np.dot(weights, x)) ``` I realize I can do ``` panel.groupby(level=0).apply(lambda x : pd.DataFrame(np.dot(weights, x), index=x.index, columns=x.columns)) ``` Would it make sense to just assume that the result should be wrapped like this if it's conformable to the other level of the MultiIndex? Too much of a special case?
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more yahoo test errors
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12
2013-07-09T20:46:53Z
2013-07-09T23:59:45Z
2013-07-09T23:59:45Z
MEMBER
null
i love a good game of whack-a-mole. https://travis-ci.org/pydata/pandas/jobs/8900734
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MDU6SXNzdWUxNjU0NzI2MA==
4,183
DOC: Expand View vs copy in the docs
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13
2013-07-09T21:01:52Z
2015-03-03T01:27:02Z
2015-03-03T01:27:02Z
CONTRIBUTOR
null
At the moment it's a common source of confusion as to what returns a view vs a copy. The [docs are fairly light on this atm](http://pandas.pydata.org/pandas-docs/dev/indexing.html#indexing-view-versus-copy). Need to expand this section with lots of example, and update with what now returns a view. I've said before to @jreback I'd do this but tbh, am not fully confident on the ins and outs so perhaps we can post a few examples here to get started.
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4,184
TST: raise when no data are found when trying to dld multiple symbols
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0
2013-07-09T23:31:56Z
2014-07-16T08:18:39Z
2013-07-09T23:59:45Z
MEMBER
null
closes #4182.
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4,185
ER: better error messages on Panel construction with non-nested dict
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1
2013-07-09T23:41:39Z
2018-07-06T20:21:00Z
2017-07-11T09:56:43Z
CONTRIBUTOR
null
see related: https://github.com/pydata/pandas/pull/4184, #4324 ``` In [2]: pd.Panel(dict(A = np.nan)) AttributeError: 'float' object has no attribute 'shape' ``` ``` In [26]: a = pd.Series(np.random.randn(4)) In [27]: b = pd.Series(np.random.randn(4), index=np.arange(1, 5)) In [28]: pd.Panel({'a': a, 'b': b}) IndexError: tuple index out of range ```
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TST: fix ujson tests failures on 32-bit
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3
2013-07-10T01:36:44Z
2014-07-16T08:18:41Z
2013-07-10T18:56:00Z
CONTRIBUTOR
null
As pointed out by @lodagro [here](https://github.com/pydata/pandas/commit/a8d15bd4c6dae2c65ed4aa4b2f76c029b6358113#commitcomment-3521549) and [here](https://github.com/pydata/pandas/commit/a8d15bd4c6dae2c65ed4aa4b2f76c029b6358113#commitcomment-3521581) some of the ujson tests fail on 32-bit due to precision errors. The changes below amend the tests so they pass.
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ENH: Series from MultiIndex causes segfault
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9
2013-07-10T11:11:43Z
2013-09-10T19:03:57Z
2013-07-13T08:21:49Z
CONTRIBUTOR
null
``` In [3]: m = pd.MultiIndex.from_arrays([[1,2], [3,4]]) In [4]: m Out[4]: MultiIndex [(1, 3), (2, 4)] In [5]: pd.Series(m) [1] 786 segmentation fault ipython pd.Series(m.values) has same fault (list of tuples) ``` Probably this should just be disallowed.
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4,188
Create DataFrame from MultiIndex
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2
2013-07-10T11:15:50Z
2013-07-10T11:48:57Z
2013-07-10T11:48:57Z
CONTRIBUTOR
null
But perhaps this should this work? ``` m = pd.MultiIndex.from_arrays([[1,2], [3,4]]) In [11]: pd.DataFrame(m) Out[11]: Empty DataFrame Columns: [0] Index: [] ``` Unfortuantely m.values doesn't work "as expected": ``` In [20]: m.values Out[20]: array([(1, 3), (2, 4)], dtype=object) In [21]: pd.DataFrame(m.values) Out[21]: 0 0 (1, 3) 1 (2, 4) In [22]: m.shape Out[22]: (0,) ```
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4,189
API: Should this raise an error or a warning in HDFStore?
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11
2013-07-10T12:53:33Z
2013-07-12T00:05:12Z
2013-07-11T13:17:51Z
CONTRIBUTOR
null
Currently in 0.12. ``` In [3]: DataFrame(randn(10,2)).to_hdf('test_storer.h5','df') In [4]: DataFrame(randn(10,2)).to_hdf('test_table.h5','df',table=True) ``` Selecting from a table is good with or without a where ``` In [6]: pd.read_hdf('test_table.h5','df',where='index>5') Out[6]: 0 1 6 0.296947 -1.876055 7 -0.200516 -0.641670 8 -0.177828 0.877286 9 0.836903 -1.626247 ``` This raises if where is not None, the theory being that passing a non-None where was a mistake. However, then you have to a-prior know if you are dealing with a `Storer` or a `Table` ``` In [7]: pd.read_hdf('test_storer.h5','df',where='index>5') TypeError: cannot pass a where specification when reading a Storer ``` make this a warning instead?
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4,190
FIX disallow MultiIndex in Series constructor GH4187
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6
2013-07-10T13:11:52Z
2014-07-07T12:44:52Z
2013-07-13T08:21:49Z
CONTRIBUTOR
null
fixes #4187 (at least the segfault part). Constructing Series with a MultiIndex raises NotImplementedError, the option (to implement this) is to return `.to_series()` ?
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4,191
API: deprecate from_csv in favor of read_csv
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16
2013-07-10T14:24:48Z
2017-10-10T04:49:21Z
2017-10-10T04:49:21Z
CONTRIBUTOR
null
just too confusion and not consistent related: #3418, #3171
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BUG: Boolean indexed assignment
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9
2013-07-10T14:52:44Z
2013-07-10T18:52:48Z
2013-07-10T18:52:48Z
CONTRIBUTOR
null
Take the simple example below: ``` s = pd.Series([1.0, 2.0], dtype=float) s[[True, False]] = np.array([2.0]) ``` The expectation would be that the first item in the series will be set to 2. Unfortunately due to a bug in broadcasting, pandas will set the first item in the series to 2*len(s). The culprit appears to be the below code (series.py:757 - where() method definition): ``` if len(other) == 1: other = np.array(other[0]*len(ser)) ``` `other` in this case is the length 1 array we need to broadcast. I believe the code made the assumption that other will be perhaps a list of lists? As it stands, this code will take the single element out of the array, multiply it by the length of the series and then carry out the update. I propose that we fix this by using np.repeat which does the correct thing (pending testing).
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4,193
Ability to scroll through dataframe or series for viewing
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9
2013-07-10T15:25:04Z
2019-10-09T04:50:43Z
2019-10-09T04:50:43Z
NONE
null
I think it would be nice to be able to scroll through a DataFrame by calling whatever scroll function and then holding down the up or down arrow to scroll through the different rows in a series or dataframe and the left and right arrows to scroll across various columns. Currently, it's a little cumbersome to type in different index ranges if you want to quickly look at different parts of a dataframe ala df[0:60], then df[60:120], etc.
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BLD: incorrect scipy version for kde plot
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2013-07-25T13:33:03Z
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MEMBER
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https://travis-ci.org/cpcloud/pandas/jobs/8931271
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BUG: (GH4192) Fixed buglet in the broadcasting logic in Series.where
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10
2013-07-10T17:08:06Z
2014-08-11T01:31:56Z
2013-07-10T18:52:48Z
CONTRIBUTOR
null
Fixed #4192
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4,196
ENH: add quantiles kw to Series.describe to create dynamic quantiles
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8
2013-07-10T19:32:55Z
2016-10-12T23:03:59Z
2014-05-14T00:45:22Z
CONTRIBUTOR
null
This of course can be done directly, but adding the keyword `quantiles` that accepts a number or list (to create multiple fields), seems like a nice idea and maybe deprecate `percentile_width` / replace with `quantiles=[50]` like this: http://stackoverflow.com/questions/17578115/pass-percentiles-to-pandas-agg-function
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4,197
BUG: resample closed='left' not binning correctly.
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5
2013-07-10T23:22:24Z
2020-03-31T06:49:24Z
2020-03-31T03:46:40Z
CONTRIBUTOR
null
related: http://stackoverflow.com/questions/21329425/resampling-a-pandas-dataframe-with-loffset-introduces-an-additional-offset-of-an Hey pandas team. Sorry to have gone MIA the past week, super busy with work. I promise (and look forward to) contributing more soon. :) Still, I wanted to note that I came across what I believe to a be a bug in `resample()` when trying to change the interval of the binning with `closed='left'`. I know that there have been a few changes to the `resample()` API since Wes' book, however, I don't believe they changed this functionality, but I have been wrong before :) Bug can be reproduced using the example from Wes' book, generating 12 mins of data like: ``` python In [3]: rng = pd.date_range('1/1/2000', periods=12, freq='T') In [4]: ts = pd.Series(np.arange(12), index=rng) In [5]: ts Out[5]: 2000-01-01 00:00:00 0 2000-01-01 00:01:00 1 2000-01-01 00:02:00 2 2000-01-01 00:03:00 3 2000-01-01 00:04:00 4 2000-01-01 00:05:00 5 2000-01-01 00:06:00 6 2000-01-01 00:07:00 7 2000-01-01 00:08:00 8 2000-01-01 00:09:00 9 2000-01-01 00:10:00 10 2000-01-01 00:11:00 11 Freq: T, dtype: int64 ``` we can do a simple resample to 5 mins like: ``` python In [6]: ts.resample('5min', how='sum') Out[6]: 2000-01-01 00:00:00 10 2000-01-01 00:05:00 35 2000-01-01 00:10:00 21 Freq: 5T, dtype: int64 ``` For my use, I need this resampling to be 'backwards looking' so that the summations at each resampled timestamp include the previous 4 minutes. Documentation (and Wes' book) suggest this is achieved by binning with `closed='left'`, however, this results in the same output as above: ``` python In [7]: ts.resample('5min', how='sum', closed='left') Out[8]: 2000-01-01 00:00:00 10 2000-01-01 00:05:00 35 2000-01-01 00:10:00 21 Freq: 5T, dtype: int64 ``` I was looking for the following result (note that the first timestamp is at `00:05:00` and with hanging data dropped): ``` python 2000-01-01 00:05:00 10 2000-01-01 00:10:00 35 Freq: 5T, dtype: int64 ``` I am able to generate this by combining `loffset='5min'` and then slicing into the resultant Series to remove the: ``` python In [10]: ts.resample('5min', how='sum', closed='left', loffset='5min')[:-1] Out[10]: 2000-01-01 00:05:00 10 2000-01-01 00:10:00 35 Freq: 5T, dtype: int64 ``` but this is hardly ideal as it's not known in advance if time series ends with a timestamp that resolves equally to the final timestamp of the resampling procedure! Apologies if I am missing something—any thoughts, help or guidance is welcomed! Thanks so much.
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MDU6SXNzdWUxNjYwODAxMw==
4,198
.ix performance regression?
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2
2013-07-11T00:12:13Z
2013-11-21T16:14:00Z
2013-07-12T00:03:55Z
MEMBER
null
is this kind of use cases reflected in our vbenchmarks? suppose @jreback is the one to ask here. more evidence need to rewrite the internals of pandas objects in C to reduce indexing overhead, among other things http://stackoverflow.com/questions/17538902/is-there-a-way-to-speed-up-this-pandas-function
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16,615,594
MDU6SXNzdWUxNjYxNTU5NA==
4,199
NaN value in dataframe caused _write_mysql error
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4
2013-07-11T06:07:09Z
2018-07-03T05:02:17Z
2013-07-11T07:22:08Z
NONE
null
- I have a dataframe with nan value inside and wanna use io.sql.write_frame function to store it in a table. - But, nan value can not be treated well by MySQLdb, it will raise an exception: ``` python OperationalError: (1054, "Unknown column 'nan' in 'field list'") ``` - I've tried to convert all nan value to None, but it turns out to be impossible, fillna function treat param value=None as "the caller don't pass a value" not "the nan value should be None" - I think add some hacks to convert nan to None in io.sql._write_mysql can fix this.
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16,618,617
MDExOlB1bGxSZXF1ZXN0Njg1NzIwMA==
4,200
BUG: convert nan to None before insert data into mysql
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21
2013-07-11T07:59:57Z
2014-06-13T17:17:53Z
2013-09-28T19:45:25Z
NONE
null
For issue #4199
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