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7,765,604
MDU6SXNzdWU3NzY1NjA0
2,101
Bug in set_index or drop
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2012-10-22T13:14:30Z
2012-11-03T00:23:14Z
2012-11-03T00:22:54Z
CONTRIBUTOR
null
I'm not sure if the bug is in the drop or that it shouldn't have let me set this MultiIndex since it's non-unique. var1 is just a combination of var2 and var3. In any event the result given back by this is garbage. I wanted to drop all the rows where the count of var1 == 1. Since there's not to my knowledge a way to dr...
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7,767,051
MDU6SXNzdWU3NzY3MDUx
2,102
DOC: add info on masking data as missing/invalid based on filters
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2
2012-10-22T14:04:40Z
2012-12-14T02:52:07Z
2012-12-14T02:52:07Z
CONTRIBUTOR
null
Tags: Communit, Docs Show how to implement: - if condition in column 1 is true: mark data in column 2 as missing / invalid - what numpy procedure shall be used to execute the mask?
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7,769,554
MDU6SXNzdWU3NzY5NTU0
2,103
Setting a MultiIndex after concat does not work properly
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1
2012-10-22T15:24:38Z
2012-11-02T16:40:07Z
2012-11-02T16:40:07Z
CONTRIBUTOR
null
Consider this. It seems to work properly after sorting but not otherwise? ``` df = pandas.DataFrame([["A","a", 1.2],["A","b", 2.2],["B", "a", 1.1],["C", "a", 1.2]], columns=["var1","var2", "var3"]) df2 = pandas.DataFrame([["A","c", 1.2],["B", "c", 4.1],["C", "c", 2.2]], columns=["var1","var2", "var3"]) df3 = pandas....
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7,775,027
MDExOlB1bGxSZXF1ZXN0MjczMTcwNg==
2,104
Unicode III : revenge of the character planes
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2012-10-22T18:27:53Z
2014-06-23T04:22:12Z
2012-10-28T10:42:42Z
NONE
null
This is the 3rd installment in the unicode saga, and once again, there's a lot of issues to point out. fair warning given. #1994 cleaned up things to use basestring and unicode() over str() where needed #2005 consolidated and implemented unicode-friendly pretty-printing The attempt here is to ensure that the internal...
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7,793,895
MDU6SXNzdWU3NzkzODk1
2,105
broken y-axis
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2012-10-23T11:14:18Z
2014-12-05T12:07:00Z
2014-12-05T12:05:30Z
CONTRIBUTOR
null
http://stackoverflow.com/questions/13027147/histogram-with-breaking-axis-and-interlaced-colorbar ![image example](http://i.stack.imgur.com/7dBRJ.png)
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7,801,537
MDU6SXNzdWU3ODAxNTM3
2,106
Timezones for PeriodIndex
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9
2012-10-23T15:53:22Z
2020-04-15T11:53:32Z
2016-10-12T18:44:32Z
CONTRIBUTOR
null
from SO: http://stackoverflow.com/questions/13030402/pandas-plot-function-ignores-timezone-of-timeseries
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7,808,002
MDU6SXNzdWU3ODA4MDAy
2,107
data_frame.xs() with MultiIndex throws exception when explicitly setting level= to the first level
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2012-10-23T19:41:30Z
2016-10-12T23:03:16Z
2012-11-03T15:23:50Z
NONE
null
I have the following DataFrame: ``` market_caps ``` > <class 'pandas.core.frame.DataFrame'> > MultiIndex: 409938 entries, (20111230, '00036110') to (20121019, 'Y8564W10') > Data columns: > market_cap 409938 non-null values > dtypes: float64(1) ``` market_caps.index.names ``` > ['date', 'security_id'] I want to...
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7,810,916
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2,108
AttributeError np._asarray_tublesafe in tseries/converter
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2012-10-23T21:22:32Z
2012-11-07T13:41:28Z
2012-10-24T15:49:36Z
NONE
null
Discovered matplotlib/axis convert_units raised AttributeError pandas/tseries/converter.py", line 157, in convert values = np._asarray_tuplesafe(values) AttributeError: 'module' object has no attribute '_asarray_tuplesafe' It can be easily fixed by adding: from pandas.core.common import _asarray_tuple and change ...
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7,825,065
MDU6SXNzdWU3ODI1MDY1
2,109
Add boolean masking operation for DataFrame
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0
2012-10-24T11:54:48Z
2012-11-02T18:09:02Z
2012-11-02T18:09:02Z
CONTRIBUTOR
null
``` import pandas import numpy as np ``` define the mask function ``` def mask(self,condition): new_self = self.copy() new_self[~condition.values] = np.nan return new_self pandas.DataFrame.mask = mask index = pandas.date_range('1/1/2000',periods=8,) columns = ['A','B','C','D'] df = pandas.DataFrame(np.ra...
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7,825,303
MDU6SXNzdWU3ODI1MzAz
2,110
Support __invert__ (unary ~) in DataFrame
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2012-10-24T12:07:09Z
2012-11-01T19:21:01Z
2012-11-01T19:21:01Z
CONTRIBUTOR
null
``` import pandas import numpy as np index = pandas.date_range('1/1/2000',periods=8,) columns = ['A','B','C','D'] df = pandas.DataFrame(np.random.randn(len(index),len(columns)),index=index printdf ``` ``` A B C D 2000-01-01 0.752832 0.083465-0.273210 1.128781 2000-01-02 0.895254 0.401056 1.473770 1.998924 2000-01-03 ...
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7,829,069
MDExOlB1bGxSZXF1ZXN0Mjc1NzM1OQ==
2,111
BUG: setup.py error message lacks cache_dir argument
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2012-10-24T14:32:46Z
2012-10-31T20:24:54Z
2012-10-31T20:24:54Z
NONE
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7,832,742
MDU6SXNzdWU3ODMyNzQy
2,112
Adding columns in groupby
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1
2012-10-24T16:21:33Z
2021-01-10T14:15:08Z
2021-01-10T14:15:08Z
MEMBER
null
Possible to simplify? xref http://stackoverflow.com/questions/12389898/python-pandas-how-to-add-a-totally-new-column-to-a-data-frame-inside-of-a-group
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MDU6SXNzdWU3ODM1MDI0
2,113
Random seg fault with groupby
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2012-10-24T17:41:03Z
2012-10-25T12:21:58Z
2012-10-24T18:16:29Z
NONE
null
I came across this seg fault when I was trying to figure out the syntax to get column means. The below example triggers the seg fault, but strangely only about 30% of the time. About 10% of the time I get a reasonable error. The randomness of the result is very strange to me because the same command was run every ti...
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2,114
rolling_mean and rolling_sum produce negative output from positive input
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2
2012-10-24T18:53:20Z
2012-11-04T22:04:13Z
2012-11-04T22:04:13Z
NONE
null
I have an array of non-negative numbers, that when used with `rolling_sum` or `rolling_mean` produce an output array that has a small negative number in it. The test looks like this: ``` python import numpy as np import pandas data = np.load('data.npy') assert all(data >= 0) sums = pandas.rolling_sum(data, 2, min_...
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7,845,903
MDU6SXNzdWU3ODQ1OTAz
2,115
Potential column indexing performance issue
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7
2012-10-25T00:22:45Z
2013-09-28T17:23:24Z
2013-09-28T17:23:24Z
MEMBER
null
xref http://stackoverflow.com/questions/12590131/how-to-slice-multindex-columns-in-pandas-dataframes
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7,855,557
MDU6SXNzdWU3ODU1NTU3
2,116
"ValueError: Could not get frequency alias for plotting" if DataFrame freq attr is None
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6
2012-10-25T11:11:06Z
2016-10-12T23:03:17Z
2012-11-02T23:29:31Z
CONTRIBUTOR
null
The following was encountered when using Pandas 0.9.0 (specifically 0.9.0~ppa6~revno-3341~quantal1 from pythonxy PPA): ``` python In [50]: df = pandas.read_csv("pandas_test.csv", parse_dates={'tstamp':[0,1]}, index_col='tstamp') In [51]: df Out[51]: flow tstamp 2008-01...
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7,860,021
MDU6SXNzdWU3ODYwMDIx
2,117
Case where xs(copy=False) does not return view.
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2
2012-10-25T13:06:57Z
2012-11-03T19:11:45Z
2012-11-03T19:11:45Z
CONTRIBUTOR
null
from [stackoverflow](http://stackoverflow.com/questions/13068551/pandas-slice-on-hierarchical-index-without-a-copy/) ``` python In [25]: cpaste Pasting code; enter '--' alone on the line to stop or use Ctrl-D. :>>> index = pd.MultiIndex.from_arrays([['a','a', 'b', 'b'], [1,2,1,2]], :... ...
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7,861,524
MDU6SXNzdWU3ODYxNTI0
2,118
adjust resample start/end dates
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2
2012-10-25T13:46:14Z
2020-05-11T18:37:51Z
2020-05-11T18:37:51Z
CONTRIBUTOR
null
so don't have to reindex twice. http://stackoverflow.com/questions/13064400/resample-to-datetimeindex-raises-an-error or furthermore, arbitrary non-reg freq resampling?
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str.split('|') failure
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0
2012-10-25T13:49:27Z
2012-11-01T00:42:14Z
2012-11-01T00:42:14Z
MEMBER
null
Look at Series with strings like 'A|B|C'
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7,861,957
MDU6SXNzdWU3ODYxOTU3
2,120
Series 'print' output truncation
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1
2012-10-25T14:00:58Z
2012-10-31T20:23:16Z
2012-10-31T20:23:03Z
NONE
null
When printing a Series (I haven't checked if the same applies to a DataFrame), the output is truncated in such a way as to change the meaning. ``` python import pandas as pd vals = [2.08430917305e+10, 3.52205017305e+10, 2.30674817305e+10, \ 2.03954217305e+10, 5.59897817305e+10] s = pd.Series(vals) print s.va...
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7,867,112
MDU6SXNzdWU3ODY3MTEy
2,121
GroupBy transform() is surprisingly slow
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6
2012-10-25T16:38:10Z
2014-06-06T21:50:03Z
2013-03-25T21:25:04Z
NONE
null
I came across a strange slowness in GroupBy transform() function. I put together a simple function to avoid using apply() because it can be REALLY slow: ``` def apply_by_group(grouped, f): """ Applies a function to each DataFrame in a DataFrameGroupBy object, concatenates the results and returns the result...
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7,868,845
MDExOlB1bGxSZXF1ZXN0Mjc3NTY3Mw==
2,122
BUG: fix unicode handling in plot label, close #2080
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6
2012-10-25T17:32:59Z
2012-11-02T22:06:26Z
2012-10-31T20:23:52Z
CONTRIBUTOR
null
#2080
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7,872,641
MDU6SXNzdWU3ODcyNjQx
2,123
Date indexing API
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2
2012-10-25T19:47:38Z
2017-01-25T21:01:44Z
2017-01-25T15:51:36Z
CONTRIBUTOR
null
The end is exclusive for integer indexing but inclusive using dates. I guess if the data is irregular it's more weird to find the first data point after what you want to include, so we shouldn't change the current API. However it is still a little confusing so just wanted to note that here.
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7,873,043
MDU6SXNzdWU3ODczMDQz
2,124
Period.end_time is same as start_time when period is D, B, H, T, or S
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2012-10-25T20:02:35Z
2016-10-12T23:03:17Z
2012-11-04T21:18:36Z
NONE
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For example: > > > p = pandas.Period('2012-10-23', 'D') > > > p.start_time > > > <Timestamp: 2012-10-23 00:00:00> > > > p.end_time > > > <Timestamp: 2012-10-23 00:00:00> There are tests, but they fail to detect the problem because they are comparing the end_time to a constant which is the start_time (so they pass).
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7,873,070
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2,125
Period.end_time is incorrect when period is W or longer
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2012-10-25T20:03:33Z
2016-10-12T23:03:17Z
2012-11-04T21:18:58Z
NONE
null
For example: > > > p = pandas.Period('2012', freq='M') > > > p.end_time > > > <Timestamp: 2012-01-31 00:00:00> This is the _start_ of the last day of the month. So if one were using this in code, you could erroneously find that any datetime on January 31st is after the end of the month of January, for example: > > ...
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7,875,233
MDU6SXNzdWU3ODc1MjMz
2,126
Can't import pandas on Mac Os 10.8.2
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1
2012-10-25T21:16:32Z
2012-10-26T06:31:41Z
2012-10-26T06:31:41Z
NONE
null
It installs without complaining both via source or pip. In both cases, upon trying to `import pandas` I get the following error: ``` dlopen(/usr/local/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pandas-0.9.1.dev_c252129-py2.7-macosx-10.8-x86_64.egg/pandas/lib.so, 2): Symbol...
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7,877,129
MDU6SXNzdWU3ODc3MTI5
2,127
DataFrame.align() does not retain DatetimeIndex timezone awareness
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2012-10-25T22:25:14Z
2012-11-04T21:24:45Z
2012-11-04T21:24:45Z
NONE
null
Aligning two DataFrames with timezone-aware DatetimeIndex indexes returns a tuple (DataFrame, DataFrame) in which both DataFrames are timezone naive.
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7,880,721
MDU6SXNzdWU3ODgwNzIx
2,128
ewma adjust incorrectly ticked for NaNs
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2012-10-26T02:22:14Z
2012-11-04T22:47:06Z
2012-11-04T22:47:05Z
NONE
null
series = pandas.Series([1., numpy.NaN, numpy.NaN, 1.], index=pandas.DatetimeIndex(start='2000-01-01', periods=4, freq='T')) pandas.ewma(series, com=5) 2000-01-01 00:00:00 1.000000 2000-01-01 00:01:00 0.545455 2000-01-01 00:02:00 0.545455 2000-01-01 00:03:00 1.000000 Almost right - but clearly the adjust f...
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7,880,737
MDU6SXNzdWU3ODgwNzM3
2,129
intersection on DatetimeIndex fails for empty indices of "quality"
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3
2012-10-26T02:24:21Z
2012-11-08T07:50:47Z
2012-11-02T16:39:22Z
NONE
null
index = pandas.DatetimeIndex(start='2000-01-01', periods=4, freq='T') index[0:0].intersection(index) Traceback (most recent call last): File "<console>", line 1, in <module> File "C:\dev\Python27\Lib\site-packages\pandas\tseries\index.py", line 845, in intersection if self[0] <= other[0]: File "C:\dev\Python...
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2,130
Benchmarks: Modifying c-parser to return unicode
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2012-10-26T08:54:52Z
2013-04-18T08:20:10Z
2013-04-18T08:20:10Z
NONE
null
Continuing here from #2104, because this is related but indep. I altered c-parser so thatparser.pyx decode all strings into unicode objects with utf-8 (b16b24b). Since any source encoding can be transcoded into utf-8, this is a general solution for getting c-parser to always return unicode. tested on py2. **Data Used*...
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2,131
at_time and between_time for DataFrame
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2012-10-26T15:17:15Z
2012-11-02T18:17:38Z
2012-11-02T18:17:38Z
CONTRIBUTOR
null
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2,132
HDFStore file size mysteriously increases
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1
2012-10-26T15:49:20Z
2014-04-29T11:17:04Z
2012-11-03T18:00:45Z
NONE
null
To reproduce the bug, do the following: ``` python df = pandas.DataFrame([['a','b'] for i in range(1,1000)]) store = pandas.HDFStore('test.h5') store['x'] = df store.close() ``` The file test.h5 is now about 1.1M (seems like a lot, but OK) now let's reopen the file ``` python store = pandas.HDFStore('test.h5') #ope...
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2,133
groupby.first() casts datetime64[ns] series to 'object' with 'long" elements
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2012-10-26T15:56:21Z
2012-11-24T23:06:35Z
2012-11-24T23:06:35Z
NONE
null
``` import numpy as np import pandas as pd df = pd.DataFrame([(1, 1351036800000000000), (2, 1351036800000000000)]) df[1] = df[1].view('M8[ns]') print df[1].dtype print df.groupby(0).first()[1].dtype print type(df.groupby(0).first()[1][1]) datetime64[ns] object <type 'long'> ```
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2,134
re-evaluate axis types on read_csv(index_col=...)
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3
2012-10-26T18:21:16Z
2013-12-18T20:05:22Z
2013-12-18T20:05:22Z
CONTRIBUTOR
null
``` python In [71]: data = """\ ....: this, that, 0, 1 ....: 10, 20, 30, 40 ....: 50, 60, 70, 80 ....: """ In [72]: df = pd.read_csv(StringIO(data), index_col=[0, 1]) In [73]: df Out[73]: 0 1 this that 10 20 30 40 50 60 70 80 In [74]: df.index # <-- ok --> Out[7...
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BUG: fix output formatting, zero trimming of floats with exp, close #212...
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2012-10-26T19:54:30Z
2012-10-31T20:23:11Z
2012-10-31T20:23:11Z
CONTRIBUTOR
null
...0 implement + test proposed fix for #2120
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2,136
DatetimeIndex.to_pydate
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2012-10-26T20:41:43Z
2014-05-29T08:11:28Z
2014-05-29T08:11:28Z
CONTRIBUTOR
null
returns datetime.date
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2,137
normalize for asfreq
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2012-10-26T21:08:18Z
2012-11-24T22:05:37Z
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CONTRIBUTOR
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e.g.: asfreq('D', normalize=True) 2011-1-1 10:00 -> 2011-1-1 00:00:00
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2,138
how to specify more flexible boundaries for fillna
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2012-10-26T21:09:01Z
2016-03-18T06:21:24Z
null
CONTRIBUTOR
null
stop filling across day boundaries, hour boundaries, etc etc
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2,139
explicitly setting Series.index should convert to TimeSeries as necessary
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2012-10-27T15:30:35Z
2012-12-09T22:43:24Z
2012-12-09T22:41:49Z
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2,140
Time rule inference regression with WOM- frequencies
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0
2012-10-27T15:31:13Z
2012-11-03T16:19:38Z
2012-11-03T16:19:38Z
MEMBER
null
This needs to be implemented (hopefully) in the frequency inference code
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MDU6SXNzdWU3OTEzMDA5
2,141
ENH: add level kw to .between_time, at_time, asfreq
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2012-10-27T18:21:40Z
2019-10-21T19:52:14Z
null
MEMBER
null
http://stackoverflow.com/questions/13030245/how-to-shift-a-pandas-multiindex-series
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2,142
Minor inconsistency?
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3
2012-10-28T04:00:34Z
2014-05-29T11:40:00Z
2014-05-29T05:37:22Z
NONE
null
Series.unique returns an numpy array but np.unique(series) returns a series. Not sure if it is intentional but it might be better to keep both the calls consistent. In [173]: a[:10] Out[173]: 0 4 1 210 2 210 3 210 4 3197 5 3197 6 3197 7 3457 8 3713 9 3741 In [174]: a[:10].unique()...
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7,921,309
MDU6SXNzdWU3OTIxMzA5
2,143
Triple Exponential Smoothing
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2012-10-28T18:08:45Z
2021-03-23T17:53:04Z
2016-09-29T22:38:05Z
NONE
null
I am writing here because I didn't find something on documentation. Sorry for spam. Is there triple exponential smoothing availiable from pandas?
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MDU6SXNzdWU3OTQyMjY0
2,144
__repr__ display of dict elements misleading
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2012-10-29T16:16:42Z
2012-11-01T00:56:44Z
2012-11-01T00:56:44Z
MEMBER
null
``` In [14]: DataFrame([data])['name'] Out[14]: 0 [full, last, ascii_first, ascii_last, first] Name: name In [15]: DataFrame([data])['name'][0] Out[15]: {u'ascii_first': u'Paul', u'ascii_last': u'Millsap', u'first': u'Paul', u'full': u'Paul Millsap', u'last': u'Millsap'} ```
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7,953,699
MDU6SXNzdWU3OTUzNjk5
2,145
Add micro- and millsecond period intervals.
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2012-10-29T22:43:36Z
2013-03-14T04:08:41Z
2013-03-14T04:08:02Z
MEMBER
null
I'm totally willing to implement this myself, but I'm not exactly sure where to begin. I tried adding a microsecond period, but it seems like there are many low level changes required (plib.pyx, period.py (obviously), period.c, period.h, datetime.pyx, datetime.pxd and others that I can't remember off the top of my head...
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7,965,976
MDU6SXNzdWU3OTY1OTc2
2,146
Printing a Series with dtype timedelta64
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2012-10-30T12:17:49Z
2013-12-04T00:57:52Z
2012-11-02T18:20:02Z
NONE
null
``` >>> import pandas as pd >>> import numpy as np >>> print pd.Series(np.array([1100, 20], dtype='timedelta64[s]')) Traceback (most recent call last): File "<stdin>", line 1, in <module> File "C:\Python27_64\lib\site-packages\pandas\core\series.py", line 911, in __str__ return repr(self) File "C:\Python27_64...
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7,996,371
MDU6SXNzdWU3OTk2Mzcx
2,147
Add column to empty DataFrame?
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4
2012-10-31T11:44:31Z
2012-11-02T20:55:12Z
2012-11-02T20:55:12Z
CONTRIBUTOR
null
I'm reading 0.9 PDF documentation, about DataFrame object. I make empty DataFrame: ``` python >>> from pandas import DataFrame >>> df = DataFrame() >>> df Empty DataFrame Columns: array([], dtype=object) Index: array([], dtype=object) >>> df['A'] = [1, 2, 3] Traceback (most recent call last): File "<stdin>", line 1...
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8,019,725
MDU6SXNzdWU4MDE5NzI1
2,148
Series.iget / DataFrame.iget_value doesn't box Timestamps
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2012-11-01T00:09:21Z
2012-11-02T21:27:55Z
2012-11-02T21:27:55Z
MEMBER
null
Unclear how important this is
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8,032,732
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2,149
ENH: at_time and between_time for DataFrame #2131
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2012-11-01T15:03:23Z
2014-06-17T14:25:08Z
2012-11-02T18:17:32Z
CONTRIBUTOR
null
pushed up to generic, raises TypeError if index doesn't have indexer_at_time
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8,033,300
MDU6SXNzdWU4MDMzMzAw
2,150
Inconsistencies in dateoffsets
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1
2012-11-01T15:22:20Z
2012-11-02T16:23:05Z
2012-11-02T16:22:54Z
CONTRIBUTOR
null
In [26]: pd.offsets.Minute().isAnchored() Out[26]: True In [27]: pd.offsets.Day().isAnchored() Out[27]: False
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8,035,566
MDExOlB1bGxSZXF1ZXN0Mjg1MTY1Mg==
2,151
ENH: DataFrame where and mask #2109
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1
2012-11-01T16:38:32Z
2014-06-13T08:10:02Z
2012-11-02T18:08:57Z
CONTRIBUTOR
null
#2109
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8,035,972
MDExOlB1bGxSZXF1ZXN0Mjg1MTg0OA==
2,152
BUG: Timestamp.astimezone returns datetime.datetime #2060
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2012-11-01T16:53:37Z
2012-11-02T16:46:09Z
2012-11-02T16:46:09Z
CONTRIBUTOR
null
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8,036,255
MDU6SXNzdWU4MDM2MjU1
2,153
include pivot_annual_hourly: annual pivoting of hourly frq.
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2012-11-01T17:03:33Z
2013-03-14T04:34:29Z
2013-03-14T04:34:29Z
CONTRIBUTOR
null
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8,037,119
MDExOlB1bGxSZXF1ZXN0Mjg1MjQ2Mw==
2,154
Ts pivot hourly
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8
2012-11-01T17:31:51Z
2013-12-04T00:57:52Z
2012-11-05T23:25:14Z
CONTRIBUTOR
null
Now I figured out. Here is the PR for #2153
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MDU6SXNzdWU4MDQwNTkz
2,155
Timestamp indexing bug
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2012-11-01T19:30:39Z
2012-11-02T21:29:46Z
2012-11-02T21:29:46Z
MEMBER
null
``` from datetime import datetime import numpy as np from pandas import DataFrame, Timestamp, DatetimeIndex import pandas.core.datetools as datetools columns = DatetimeIndex(start='1/1/2012', end='2/1/2012', freq=datetools.bday) index = range(10) data = DataFrame(columns=columns, index=index) t = datetime(2012, 11, 1)...
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2,156
Typo in the Documentation
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0
2012-11-01T19:39:08Z
2012-11-09T23:53:31Z
2012-11-01T20:53:26Z
CONTRIBUTOR
null
http://pandas.pydata.org/pandas-docs/dev/io.html?highlight=to_csv in the To_csv section: ``` sep : Field delimiter for the output file (default “’”) ``` should be ``` sep : Field delimiter for the output file (default “, ”) ```
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2,157
off-center grid in case of stacked bar plot
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1
2012-11-01T20:22:14Z
2012-11-04T02:35:25Z
2012-11-04T02:35:25Z
CONTRIBUTOR
null
from [mailing list](https://groups.google.com/forum/#!searchin/pydata/Spacing$20error$20in$20bar$20graphs/pydata/KkIz8evL4As/ft8Puy8UwCwJ) ``` python df = DataFrame({'A' : [3] * 5, 'B' : range(5)}, index = range(5)) df.plot(kind='bar', stacked='True', grid=True) ``` ![example image](http://i.imgur.com/c1AMA.png)
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8,042,829
MDU6SXNzdWU4MDQyODI5
2,158
writing and reading dataframes with lists as members
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2012-11-01T20:50:42Z
2014-10-30T06:32:39Z
2014-05-29T05:43:42Z
CONTRIBUTOR
null
I am not sure if this is a feature or a bug but when I use the default to_csv() and read_csv() functions on dataframes that have lists as members, I lose the lists. This is a copy of [this stack overflow post.](http://stackoverflow.com/questions/13184553/list-to-string-in-df-to-csv#13184793) ``` df1 = DataFrame({'a':...
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2,159
ENH: rank na_options top and bottom #1508
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2012-11-02T02:04:40Z
2014-06-12T04:55:31Z
2012-11-02T16:55:47Z
CONTRIBUTOR
null
#1508
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8,049,123
MDU6SXNzdWU4MDQ5MTIz
2,160
`allow_gaps` option in rank
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3
2012-11-02T02:06:43Z
2017-06-05T09:18:04Z
2017-06-05T09:18:04Z
CONTRIBUTOR
null
when there are ties, whether the next rank will be the nearest integer to the current rank or tie-count ranks away.
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8,060,294
MDU6SXNzdWU4MDYwMjk0
2,161
Use index name (if any) in to_records
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2012-11-02T14:39:03Z
2012-11-02T21:35:26Z
2012-11-02T21:35:26Z
MEMBER
null
xref http://stackoverflow.com/questions/13187778/pandas-dataframe-to-numpy-array-include-index
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MDU6SXNzdWU4MDYwNTYx
2,162
GroupBy shifting performance issue
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2
2012-11-02T14:49:11Z
2013-09-21T17:10:39Z
2013-09-21T17:10:39Z
MEMBER
null
``` ids = np.arange(48000) lens = np.maximum(np.round(15+9.5*np.random.randn(48000)), 1.0).astype(int) id_vec = np.repeat(ids, lens) lens_shift = np.concatenate(([0], lens[:-1])) mon_vec = np.arange(lens.sum()) - np.repeat(np.cumsum(lens_shift), lens) n = len(mon_vec) df = pd.DataFrame.from_items([('pool', id_vec), ('m...
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2,163
DataFrame.to_panel discards minor index name
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Panel.shift with negative numbers broken
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8,065,663
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2,165
BUG: exclude timedelta64 from integer dtypes #2146
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1
2012-11-02T17:39:08Z
2014-06-25T18:03:15Z
2012-11-02T18:20:09Z
CONTRIBUTOR
null
com.is_integer_dtype now returns False for dtype timedelta64 #2146
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2,166
BUG: xs MultiIndex integer level problem #2107
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2012-11-03T02:21:51Z
2012-11-03T15:23:42Z
2012-11-03T15:23:42Z
CONTRIBUTOR
null
purely positional indexing would solve this problem better
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2,167
Strange output in DataFrame representation of datetime64
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1
2012-11-03T03:56:34Z
2012-11-03T19:23:06Z
2012-11-03T19:23:06Z
CONTRIBUTOR
null
It looks like printing a DataFrame's representation gives a strange result when one column is datetime64. Details in this SO post: http://stackoverflow.com/questions/13202326/pandas-to-datetime-produces-confusing-result
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2,168
Refactor parameter hell for plotting
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2012-11-03T15:34:45Z
2013-07-26T14:18:05Z
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8,080,274
MDExOlB1bGxSZXF1ZXN0Mjg3MzMzMg==
2,169
Plot color
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2012-11-03T15:38:56Z
2012-11-03T16:22:45Z
2012-11-03T16:22:45Z
CONTRIBUTOR
null
Deprecate 'colors' parameter in LinePlot. Otherwise frame.plot(color='rgb') fails but frame.plot(kind='bar', color='rgb') works.
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8,082,884
MDExOlB1bGxSZXF1ZXN0Mjg3NDEzNw==
2,170
BUG: start_time end_time to_timestamp bugs #2124 #2125 #1764
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1
2012-11-03T20:49:25Z
2014-07-13T09:26:33Z
2012-11-04T21:18:12Z
CONTRIBUTOR
null
@wesm can you review this plz? The main change is I have to_timestamp default to second frequency now to get the first and last second of the Period. This doesn't **quite** solve #2125 since Timestamp resolution goes down to Nanos. So the question is is it appropriate to add 999999999ns to the end_time when ns doesn't...
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8,091,325
MDU6SXNzdWU4MDkxMzI1
2,171
GroupBy transform() throws unexpected exception when sorting each DataFrame
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6
2012-11-04T19:33:25Z
2013-04-10T07:24:52Z
2013-04-10T07:24:52Z
NONE
null
I have the following DataFrame: ``` data ``` > <class 'pandas.core.frame.DataFrame'> > MultiIndex: 410322 entries, (20111230, '00036110') to (20121019, 'Y8564W10') > Data columns: > market_cap 410117 non-null values > average_volume 410322 non-null values > return_std_daily 410322 non-null v...
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https://api.github.com/repos/pandas-dev/pandas/issues/2172
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8,091,742
MDU6SXNzdWU4MDkxNzQy
2,172
Use index option for bar plot
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3
2012-11-04T20:17:59Z
2013-09-21T13:24:41Z
2013-09-21T13:24:35Z
CONTRIBUTOR
null
help with bar and line plot types
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8,091,836
MDExOlB1bGxSZXF1ZXN0Mjg3NjgwNg==
2,173
BUG: stop overridding matplotlib unit registrations for datetime.datetim...
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1
2012-11-04T20:27:09Z
2012-11-06T07:17:43Z
2012-11-05T04:06:45Z
CONTRIBUTOR
null
...e/date/time but keep registration for pandas specific classes Period and Timestamp
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8,092,398
MDExOlB1bGxSZXF1ZXN0Mjg3Njk2Nw==
2,174
BUG: Series.diff for integer dtypes #2087
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2
2012-11-04T21:26:39Z
2014-06-17T00:19:46Z
2012-11-04T23:03:21Z
CONTRIBUTOR
null
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8,096,303
MDU6SXNzdWU4MDk2MzAz
2,175
read_table issue with complex text file
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7
2012-11-05T04:15:01Z
2012-12-13T14:05:30Z
2012-12-13T14:05:30Z
NONE
null
When using read_table to read a "|" delimited text file, an error stating "Exception: Reindexing only valid with uniquely valued Index objects" came up. It was not obvious at first glance what the problem was, so I set the option "header" to None and then parsing the file was fine. Here's the link to text file, http:/...
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8,098,714
MDExOlB1bGxSZXF1ZXN0Mjg3OTMzOA==
2,176
Misc fixes: comment cleanup and remove deprecated arg
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2012-11-05T08:21:54Z
2012-11-05T15:16:01Z
2012-11-05T15:16:01Z
NONE
null
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8,103,263
MDExOlB1bGxSZXF1ZXN0Mjg4MTM2Mg==
2,177
CLN: fix indent in bench_merge_sqlite
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2012-11-05T12:27:10Z
2014-06-22T13:36:18Z
2012-11-05T15:15:00Z
NONE
null
was breaking Rope.
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2,178
CLN: Typo fix in documentation
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2012-11-05T12:52:22Z
2012-11-05T12:57:02Z
2012-11-05T12:53:08Z
CONTRIBUTOR
null
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2,179
BUG: df.from_records() is all kinds of broken
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9
2012-11-05T12:58:16Z
2012-11-24T18:49:32Z
2012-11-24T18:49:32Z
NONE
null
- the `columns` argument gets clobbered: In [13]: pd.DataFrame.from_records({1:["foo"],2:["bar"]},columns=['a','b']).columns Out[13]: Index([1, 2], dtype=int64) - if `index` is specified, and `result_index` computed, it will get clobbered later on. - if `index` is specified as a list of labels, with the first few...
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8,104,425
MDExOlB1bGxSZXF1ZXN0Mjg4MTg3OQ==
2,180
CLN: Fixed a typo in the documentation.
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2012-11-05T13:21:00Z
2012-11-05T15:14:02Z
2012-11-05T15:14:02Z
CONTRIBUTOR
null
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8,105,302
MDExOlB1bGxSZXF1ZXN0Mjg4MjI5NQ==
2,181
CLN: Some minor cleanup in io/tests/test_parsers.py
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1
2012-11-05T13:58:18Z
2012-11-05T15:13:12Z
2012-11-05T15:13:12Z
CONTRIBUTOR
null
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8,119,737
MDU6SXNzdWU4MTE5NzM3
2,182
python crash without exception
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9
2012-11-05T21:27:28Z
2012-11-07T15:06:38Z
2012-11-05T22:28:08Z
NONE
null
I'm using pandas 0.9.0. I have a function that returns a DataFrame. The resulting DataFrame is 'unstable': many operations I try on it, interactively in IPython, lead to a complete python.exe crash. I get no exception or indication on what's going wrong which is very frustrating. Some operations do work however, li...
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8,123,961
MDExOlB1bGxSZXF1ZXN0Mjg5MTAxMw==
2,183
corrected version of ts_hourly
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5
2012-11-05T23:45:15Z
2014-06-27T22:56:10Z
2012-12-03T19:02:18Z
CONTRIBUTOR
null
small glitch in the function but mainly fixes in tests
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8,139,626
MDU6SXNzdWU4MTM5NjI2
2,184
Parser shouldn't convert to numeric if custom converter supplied for column
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1
2012-11-06T14:06:51Z
2012-11-06T17:24:30Z
2012-11-06T17:24:30Z
CONTRIBUTOR
null
xref: http://stackoverflow.com/questions/13250046/pandas-csv-import-keep-leading-zeros-in-a-column
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2,185
incompatible freq conversions in timeseries plotting
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2012-11-06T17:38:24Z
2013-09-22T00:50:31Z
2013-09-22T00:50:31Z
CONTRIBUTOR
null
should plot as irregular if periods are incompatible (e.g., monthly and weekly)
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8,152,769
MDU6SXNzdWU4MTUyNzY5
2,186
Integrate grouped histogram plots into hist_series and hist_frame
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1
2012-11-06T21:15:21Z
2013-07-29T03:24:01Z
2013-07-29T03:24:01Z
CONTRIBUTOR
null
add new by keyword
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8,157,783
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2,187
Handling of newline at end of file in read_csv
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1
2012-11-07T00:38:20Z
2012-11-07T01:03:56Z
2012-11-07T01:03:56Z
MEMBER
null
``` In [1314]: data = """\ ......: A,B,C ......: 00001,001,5 ......: 00002,002,6 ......: """ ......: In [1315]: from cStringIO import StringIO In [1316]: read_csv(StringIO(data), converters={'A' : lambda x: x.strip()}) Out[1316]: A B C 0 00001 1 5 1 00002 2 6 2 NaN NaN ...
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MDU6SXNzdWU4MTYzMzY2
2,188
Symbol not found: _floatify in pandas/lib.so on Mac 10.8 with numpy master
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2012-11-07T08:27:53Z
2014-09-13T20:32:32Z
2012-11-25T21:08:16Z
CONTRIBUTOR
null
After updating pandas I can't import it any more because the symbol _floatify is undefined in pandas/lib.so: ``` $ python -c 'import pandas' dlopen(/Users/deil/Library/Python/2.7/lib/python/site-packages/pandas-0.9.1.dev_7156920-py2.7-macosx-10.8-x86_64.egg/pandas/lib.so, 2): Symbol not found: _floatify Referenced f...
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2,189
bug in dataframe.join()
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4
2012-11-07T10:32:38Z
2012-11-09T17:18:15Z
2012-11-09T17:18:15Z
NONE
null
Hi all, I have a strange issue with pandas 0.9, I think it's a bug. I'm trying to use dataframe.join() and it works well on a random dataframe, but not on a dataframe created from my simulation result. The code below shows that join() on the second dataframe blows up the index and the result is completely wrong. ...
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8,175,753
MDU6SXNzdWU4MTc1NzUz
2,190
Add exponentiation function similar to add() or sub()
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1
2012-11-07T16:16:20Z
2012-11-09T18:05:36Z
2012-11-09T18:05:36Z
CONTRIBUTOR
null
Currently if I exponentiate a DataFrame with a Series, the indexing joining logic is performed on the columns. This means the following: ``` python >>> data = pandas.DataFrame({"a": [1, 2, 3, np.nan], "b": [23, 4, 5, np.nan]}, index=["ax", "bx", "cx", "dx"]) >>> series = pandas.Series([2,2,3, 1], index=["ax", "bx", "c...
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8,184,156
MDU6SXNzdWU4MTg0MTU2
2,191
DataFrame.add with fill_value bug
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3
2012-11-07T19:58:11Z
2012-11-09T03:22:03Z
2012-11-09T03:21:53Z
MEMBER
null
Very, very surprised this bug isn't caught by the test suite. df1 = pandas.DataFrame({'a':{True:1,False:5},'b':{True:7,False:8}}) df2 = pandas.DataFrame({'a':{True:1,False:5},'c':{True:7,False:8}}) ``` In [15]: df1.add(df2, fill_value=0) Out[15]: a b c False 10 NaN NaN True 2 NaN NaN ```
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8,187,035
MDU6SXNzdWU4MTg3MDM1
2,192
non-unique joins
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1
2012-11-07T21:40:31Z
2014-02-18T01:38:24Z
2014-02-18T01:38:24Z
CONTRIBUTOR
null
maybe have option to not do cross join. instead just join on order of appearance for the non-unique elements (and fill-in NAs for the rest)? Related: #2189
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8,188,284
MDU6SXNzdWU4MTg4Mjg0
2,193
Cannot produce DataFrame from dict-yielding iterator.
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26
2012-11-07T22:21:44Z
2018-07-26T13:00:55Z
2018-07-26T13:00:55Z
NONE
null
Hi there, I have a codebase that (so far) consumes data series in the form of dict-yielding iterators, similar in form to how DataFrame's constructor accepts a list of such. Unfortunately it seems from current implementation of that constructor, there is no straightforward way to consume from an iterator straight into...
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MDU6SXNzdWU4MTg5NTA1
2,194
error msg when trying to split duplicated columns across dtypes
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3
2012-11-07T23:04:40Z
2013-05-02T14:53:28Z
2013-05-02T14:53:28Z
CONTRIBUTOR
null
right now it fails in list of lists but the error isn't informative. xref: commit 5a152bdfdd044c6f53c76b361065b1784dc73b61
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8,194,662
MDExOlB1bGxSZXF1ZXN0MjkyNDE4MA==
2,195
Updating help text for plot_series
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1
2012-11-08T04:30:52Z
2012-11-09T23:53:16Z
2012-11-08T14:23:06Z
CONTRIBUTOR
null
description for parameter 'kind' was given twice.
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8,201,289
MDU6SXNzdWU4MjAxMjg5
2,196
index.union does not sort monotonic indexes
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2012-11-08T11:26:40Z
2012-11-09T17:58:02Z
2012-11-09T17:58:02Z
NONE
null
from [StackOverflow](http://stackoverflow.com/questions/13279690/unexpected-behavior-when-combining-two-dataframes-in-pandas): While index.union is not guaranteed to sort results, it does not try to sort the result for monotonic indexes, but does try to sort non-monotonic indexes.
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8,208,241
MDExOlB1bGxSZXF1ZXN0MjkzMDQ3OQ==
2,197
BUG: join_non_unique doesn't sort properly for DatetimeIndex #2196
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0
2012-11-08T15:48:53Z
2012-11-09T16:43:07Z
2012-11-09T16:43:07Z
CONTRIBUTOR
null
use the int64 factorizer
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8,221,365
MDU6SXNzdWU4MjIxMzY1
2,198
ae63ebf broke test suits
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2013-02-05T22:28:02Z
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NONE
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ae63ebf77b355591413f15bf77d30943e9f957b FAIL: testWLS (pandas.stats.tests.test_ols.TestOLS) Traceback (most recent call last): File "/home/user1/src/pandas/pandas/stats/tests/test_ols.py", line 92, in testWLS self._check_wls(X, Y, weights) File "/home/user1/src/pandas/pandas/stats/tests/test_ols.py", line 115...
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2,199
Curious: df.ix[False] returns the first row
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2012-11-08T22:38:32Z
2012-11-09T18:18:21Z
2012-11-09T17:00:35Z
NONE
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``` python In [21]: df=pd.DataFrame({"a":[1,2,3]}) ...: df.ix[False] Out[21]: a 1 Name: 0 ``` Don't know if this is a bug or intentiional.
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2,200
Breakage when setting MultiIndex with a mutable sequence
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closed
false
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{ "closed_at": "2012-11-18T18:54:52Z", "closed_issues": 130, "created_at": "2012-10-11T19:38:39Z", "creator": { "avatar_url": "https://avatars.githubusercontent.com/u/329591?v=4", "events_url": "https://api.github.com/users/wesm/events{/privacy}", "followers_url": "https://api.github.com/users/wesm/...
0
2012-11-08T23:13:36Z
2012-11-09T17:40:06Z
2012-11-09T17:40:06Z
NONE
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``` python import pandas as pd df=pd.DataFrame({"a":[1,2,3],"b":[4,5,6],"c":[7,8,9]}).set_index(["a","b"]) l=list(df.index) l[0]=("faz","boo") df.index=l print df # all good l[0]=["faz","boo"] df.index=l print df # badness ``` If this acceptable usage and index entries must be immutable, failing early would be good. ...
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