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Pandas: AttributeError: 'numpy.ndarray' object has no attribute 'start'
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"2013-06-14T09:34:59Z"
"2013-06-18T15:25:40Z"
"2013-06-18T13:11:18Z"
NONE
null
``` python import numpy as np import pandas as pd import matplotlib.pyplot as plt from datetime import time data = pd.read_csv('/temp/zondata/pvlog.csv', delimiter=';', parse_dates=True, index_col=1) Gewenst = data['T_Sanyo_Open'] ``` Next 2 examples(in Ipython console) gives no errors, and gives a result like the table at the bottom of this question: ``` python Gewenst['2010'] Gewenst['2010-09'] ``` Example below gives me previously described error when I want a specific bounded range of data: ``` python Gewenst['2010-9':'2010-10'] ``` I found a solution when I add this rule of code: ``` python Gewenst = Gewenst.resample('1Min', fill_method='ffill') ``` But I don't want to resample the data. table: ``` python 2010-08-31 12:36:53 30.37 2010-08-31 12:45:08 28.03 2010-08-31 12:55:09 25.16 2010-08-31 13:00:09 23.28 2010-08-31 13:05:09 22.37 2010-08-31 13:10:09 21.84 2010-08-31 13:15:08 22.19 2010-08-31 13:20:09 22.41 2010-08-31 13:25:09 23.16 2010-08-31 13:35:09 23.59 2010-08-31 13:40:09 26.75 2010-08-31 13:45:09 29.47 2010-08-31 13:50:10 33.13 2010-08-31 13:55:08 35.91 2010-08-31 14:00:08 37.78 ... 2013-06-07 01:35:10 40.00 2013-06-07 01:40:10 40.00 2013-06-07 01:45:10 39.50 2013-06-07 01:50:12 39.75 2013-06-07 01:55:10 39.25 2013-06-07 02:00:10 39.50 2013-06-07 02:05:11 39.25 2013-06-07 02:10:11 39.25 2013-06-07 02:15:10 38.75 2013-06-07 02:20:11 38.75 2013-06-07 02:25:11 38.75 2013-06-07 02:30:10 39.25 2013-06-07 02:40:10 39.25 2013-06-07 02:45:10 39.00 2013-06-07 02:50:10 39.25 ``` Does anyone have solution, or is this a bug in Pandas?
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3,902
ENH: (GH3863) Timestamp.min and Timestamp.max return a valid Timestamp
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25
"2013-06-14T10:17:04Z"
"2014-06-14T06:16:44Z"
"2013-07-02T14:39:10Z"
CONTRIBUTOR
null
closes https://github.com/pydata/pandas/issues/3863 by adding valid min and max fields to the Timestamp class.
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BLD: add setup_requires in setup.py so pandas can be used with buildout
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4
"2013-06-14T10:30:26Z"
"2014-07-16T08:14:08Z"
"2013-06-18T23:29:05Z"
CONTRIBUTOR
null
Numpy is a setup-time dependency due to some .h files, but is not declared as such. This causes tools like buildout ( http://buildout.org/ ) to fail. Adding the `setup_requires` kwarg to the setuptools config shoud fix this: buildout will correctly assemble any declared setup-time dependencies, before executing the pandas build. closes #3861
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BUG/API: date_conversion in read_csv with int vs float component parts
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1
"2013-06-14T13:12:33Z"
"2013-09-22T17:07:05Z"
"2013-09-22T17:07:05Z"
CONTRIBUTOR
null
from the ML https://groups.google.com/forum/?fromgroups#!topic/pydata/Lc10-vz4NpU not really sure if this is a bug, more of a convention ``` In [58]: data = "YEAR,DOY,TEMP\n2001,1,10.5\n2001,2,11.8\n2001,3,67.4" In [59]: def date_converter(x): return dt.datetime.strptime(x, '%Y %j') In [60]: pandas.read_csv(StringIO(data), parse_dates=[[0,1]], index_col=0, sep=",", keep_date_col=True, date_parser=date_converter) Out[60]: YEAR DOY TEMP YEAR_DOY 2001-01-01 2001 1 10.5 2001-01-02 2001 2 11.8 2001-01-03 2001 3 67.4 In [61]: data = "YEAR,DOY,TEMP\n2001.0,1.0,10.5\n2001.0,2.0,11.8\n2001.0,3,67.4" In [62]: def date_converter2(*args): return dt.datetime(int(float(args[0])),int(float(args[1])),1) ....: In [63]: pandas.read_csv(StringIO(data), parse_dates=[[0,1]], index_col=0, sep=",", keep_date_col=True, date_parser=date_converter2) Out[63]: YEAR DOY TEMP YEAR_DOY 2001-01-01 2001.0 1.0 10.5 2001-02-01 2001.0 2.0 11.8 2001-03-01 2001.0 3 67.4 ```
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Out-by-one error when slicing a TimeSeries with date-strings
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13
"2013-06-14T14:50:11Z"
"2014-04-23T23:15:47Z"
"2013-07-01T15:43:48Z"
CONTRIBUTOR
null
...when the hour is not zero. Example below: ``` python In [7]: series = pd.TimeSeries(numpy.arange(5), pd.date_range('2014-01-01 09:00', periods=5, freq='D')) ...: series ...: Out[7]: 2014-01-01 09:00:00 0 2014-01-02 09:00:00 1 2014-01-03 09:00:00 2 2014-01-04 09:00:00 3 2014-01-05 09:00:00 4 Freq: D, dtype: int32 In [8]: series[pd.datetime(2014, 1, 2):pd.datetime(2014, 1, 4)] Out[8]: 2014-01-02 09:00:00 1 2014-01-03 09:00:00 2 Freq: D, dtype: int32 In [9]: series['02-Jan-2014':'04-Jan-2014'] Out[9]: 2014-01-02 09:00:00 1 2014-01-03 09:00:00 2 2014-01-04 09:00:00 3 <------------------------- ??? Freq: D, dtype: int32 In [10]: ```
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https://api.github.com/repos/pandas-dev/pandas/issues/3906
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15,572,136
MDExOlB1bGxSZXF1ZXN0NjMzMzUxOQ==
3,906
TST: convert knowntestfailures to skip tests
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0
"2013-06-14T18:41:53Z"
"2014-06-18T17:41:16Z"
"2013-06-14T19:07:45Z"
CONTRIBUTOR
null
in test_pickle, test_stats closes #3894, #3896
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MDU6SXNzdWUxNTU3MjM1MA==
3,907
BUG: replace not converting dtypes
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27
"2013-06-14T18:46:53Z"
"2016-10-12T23:03:53Z"
"2013-06-15T12:34:13Z"
CONTRIBUTOR
null
I believe `replace` should do a `convert_objects(copy=False)` after replacement to provide dtype soft-conversion ``` In [1]: df = DataFrame([['foo','bar','bah'],['bar','foo','bah']]) In [2]: df Out[2]: 0 1 2 0 foo bar bah 1 bar foo bah In [3]: m = { 'foo' : 1, 'bar' : 2, 'bah' : 3 } In [5]: df.replace(m) Out[5]: 0 1 2 0 1 3 2 1 2 1 3 In [6]: df.replace(m).dtypes Out[6]: 0 object 1 object 2 object dtype: object In [8]: df.replace(m).convert_objects().dtypes Out[8]: 0 int64 1 int64 2 int64 dtype: object ```
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Possible Problems with ga.read_ga
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3
"2013-06-14T21:41:38Z"
"2014-05-30T01:16:10Z"
"2014-05-30T01:16:10Z"
NONE
null
Hi, I have a python script that runs on a daily basis and I noticed a problem this morning with the ga.read function. Nothing has changed with my GA account and I have not touched the python script. I've attached the error message below: ``` python --------------------------------------------------------------------------- TypeError Traceback (most recent call last) /Library/Python/2.7/site-packages/ipython-0.13.1-py2.7.egg/IPython/utils/py3compat.pyc in execfile(fname, *where) 176 else: 177 filename = fname --> 178 __builtin__.execfile(filename, *where) /Users/danielcollins/Documents/GA Python/EngCompCombined.py in <module>() 161 # account_id=account_id, 162 max_results=max_results, --> 163 chunksize=5000) 164 165 df1_conc = pd.concat([x for x in df1]) /Library/Python/2.7/site-packages/pandas/io/ga.pyc in read_ga(metrics, dimensions, start_date, **kwargs) 100 reader = GAnalytics(**reader_kwds) 101 return reader.get_data(metrics=metrics, start_date=start_date, --> 102 dimensions=dimensions, **kwargs) 103 104 /Library/Python/2.7/site-packages/pandas/io/ga.pyc in get_data(self, metrics, start_date, end_date, dimensions, segment, filters, start_index, max_results, index_col, parse_dates, keep_date_col, date_parser, na_values, converters, sort, dayfirst, account_name, account_id, property_name, property_id, profile_name, profile_id, chunksize) 255 account = self.get_account(account_name, account_id) 256 web_property = self.get_web_property(account.get('id'), property_name, --> 257 property_id) 258 profile = self.get_profile(account.get('id'), web_property.get('id'), 259 profile_name, profile_id) /Library/Python/2.7/site-packages/pandas/io/ga.pyc in get_web_property(self, account_id, name, id, **kwargs) 211 kwds['accountId'] = account_id 212 prop_for_acct = prop_store.list(**kwds).execute() --> 213 return _get_match(prop_for_acct, name, id, **kwargs) 214 215 def get_profile(self, account_id=None, web_property_id=None, name=None, /Library/Python/2.7/site-packages/pandas/io/ga.pyc in _get_match(obj_store, name, id, **kwargs) 387 388 if name is None and id is None and key is None: --> 389 return obj_store.get('items')[0] 390 391 name_ok = lambda item: name is not None and item.get('name') == name TypeError: 'NoneType' object is not subscriptable --------------------------------------------------------------------------- ``` I currently use Pandas v 0.11.0 (numpy 1.7.1) but I have tried uninstalling and reverting back to 0.10.1 just in case (didn't think this would help!) - Is it failing to pickup details associated with my account? In the above I have commented out my hardcoded account_id as i have never had to submit this before. I have also tried the same query in the Google API Query Explorer and it still works fine. This is my first post on github and I am a python beginner so please forgive any obvious mistakes. Thanks Dan
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BUG/API: remove infer_types from replace and fix compiled regex bug
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17
"2013-06-14T22:26:30Z"
"2014-07-04T21:31:30Z"
"2013-06-15T12:34:13Z"
MEMBER
null
closes #3907.
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TST: Make network decorator impose a skipTest catching URLErrors
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5
"2013-06-15T01:29:17Z"
"2013-06-21T01:48:25Z"
"2013-06-21T01:48:25Z"
CONTRIBUTOR
null
Basically, do this in the network decorator: ``` python @wraps def network_wrapper(*args, **kwargs): try: return t(*args, **kwargs) except URLError: raise nose.skipTest ``` Working on it right now
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Blocker for 0.11.1. This got broken sometime between 0.11.0 and master; I haven't had time to bisect yet. Essentially, write a mixed type DataFrame and a groupby function that extracts a row. This used to do type inference and convert object back to numeric in the columns of the resulting DataFrame. Didn't have a test so I don't blame anyone for breaking it by accident =) ``` In [151]: cafdata.dtypes Out[151]: id int64 food object fgroup object nutrient object ngroup object units object value float64 dtype: object In [152]: def max_value(group): return group.ix[group['value'].idxmax()] max_value(cafdata) Out[152]: id 14366 food Tea, instant, unsweetened, powder fgroup Beverages nutrient Caffeine ngroup Other units mg value 3680 Name: 336702, dtype: object In [153]: cafdata.groupby('fgroup').apply(max_value).dtypes Out[153]: id object food object fgroup object nutrient object ngroup object units object value object dtype: object ```
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BUG: (GH3911) groupby appying with custom function not converting dtypes of result
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CONTRIBUTOR
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closes #3911
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TST: Move explicit connectivity checks to decorator.
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55
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"2014-06-12T07:13:41Z"
"2013-06-21T01:48:25Z"
CONTRIBUTOR
null
Instead, `network` decorator in pandas.util.testing catches `IOError` instead. You have to opt into failing on tests by setting `pandas.util.testing._RAISE_NETWORK_ERROR_DEFAULT` to `True`. Also adds a `with_network_connectivity_check` that can automatically check for a connection. Fixes #3910. This version of the fix ignores all IOErrors and assumes there are connectivity problems with any URLError.
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CLN: Fix CRLFs in repo + add .gitattributes
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CONTRIBUTOR
null
View this pull request with [`?w=t`](https://github.com/pydata/pandas/pull/3915?w=t) added to the end of the url to see that there are not differences [aside from the .gitattributes files] - this should prevent more commits with CRLF entering the repo. I think it'd be good to merge this (especially because we can avoid this happening in the future.), though (I think) it'll mess up the history for 10 minutes to pandas and `pandas/core/expressions.py`. After this, will never need to deal with CRLF again! Yay!
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pandas.io.tests.test_google:TestGoogle.test_get_data hangs during local testing
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3,917
BUG: Nested sort with NaN
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4
"2013-06-15T18:48:37Z"
"2014-04-05T19:32:40Z"
"2014-03-27T22:23:50Z"
CONTRIBUTOR
null
Nested sort doesn't seem to work with NaNs, see [this SO question](http://stackoverflow.com/questions/17126500/pandas-nested-sort-and-nan). ``` In [11]: df Out[11]: a b 0 1 9 1 2 NaN 2 NaN 5 3 1 2 4 6 5 5 8 4 6 4 5 In [12]: df.sort(columns=["a","b"]) Out[12]: a b 3 1 2 0 1 9 1 2 NaN 2 NaN 5 6 4 5 4 6 5 5 8 4 ``` (It works as expected using a single columns)
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3,918
is_s3_url will not work
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9
"2013-06-15T19:31:23Z"
"2013-07-28T00:07:15Z"
"2013-06-16T16:12:16Z"
MEMBER
null
as per [the amazon docs](http://docs.aws.amazon.com/AmazonS3/latest/dev/VirtualHosting.html#VirtualHostingCustomURLs) > "Any bucket with a DNS compatible name may be referenced as follows: http://[BucketName].s3.amazonaws.com/[Filename], for example, http://images.johnsmith.net.s3.amazonaws.com/mydog.jpg. Using CNAME you can map images.johnsmith.net to an Amazon S3 host name so the previous URL could become: http://images.johnsmith.net/mydog.jpg." this function is looking at the scheme which will never test as `'s3'` since that is not (to my knowledge) a valid URL protocol
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3,919
ER: remove all calls to str in error messages
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8
"2013-06-15T23:21:09Z"
"2013-08-07T17:58:11Z"
"2013-08-07T17:58:11Z"
MEMBER
null
``` In [9]: df = mkdf(10, 10, data_gen_f=lambda *args: randint(2), c_idx_type='u', r_idx_type='u') In [10]: df.sort_index(df.columns[0]) ``` barfs a `UnicodeEncodeError` inside of a `ValueError`. this maybe ongoing, but might be easy enough to use a macro to correct this in a reasonably fast way
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BUG: Add import for 'is_datetime64_dtype'
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9
"2013-06-16T03:41:25Z"
"2014-07-16T08:14:25Z"
"2013-06-17T12:21:25Z"
CONTRIBUTOR
null
This import was missing from `core/groupby.py`. This also suggests that there is an issue with the test cases, given that no test triggers this issue (suggesting that there is no current test that triggers the `elif` condition below). ``` python def _try_cast(self, result, obj): """ try to cast the result to our obj original type, we may have roundtripped thru object in the mean-time """ try: if obj.ndim > 1: dtype = obj.values.dtype else: dtype = obj.dtype if _is_numeric_dtype(dtype): # need to respect a non-number here (e.g. Decimal) if len(result) and issubclass(type(result[0]),(np.number,float,int)): result = _possibly_downcast_to_dtype(result, dtype) elif issubclass(dtype.type, np.datetime64): if is_datetime64_dtype(obj.dtype): result = result.astype(obj.dtype) ```
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3,921
CLN: Remove unused Exceptions
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25
"2013-06-16T04:52:12Z"
"2014-07-06T05:46:03Z"
"2013-06-19T01:13:57Z"
CONTRIBUTOR
null
There are at least 3 `Exception`s that are _never_ raised anywhere, so they can be removed without issue. (There are other exceptions that probably should be removed or refactored, but this is just a basic commit to make sure that these don't get used going forward.) CLN: Remove 'DateConversionError' that is never raised anywhere CLN: Remove TimeSeriesError that was never used CLN: Remove unused 'PanelError'
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3,922
pandas appears to crash doing pivot table from 10 minute examples
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53
"2013-06-16T07:24:05Z"
"2014-09-08T14:22:11Z"
"2013-06-21T20:16:55Z"
NONE
null
pandas 0.11.0 installed with Python 2.7.2 using "pip install pandas" on fully patched mac osx 10.8.5, running in a virtual environment. running any pivot table against any DataFrame create so for -- nothing happens. pressing ctrl-c I see the latest lines run are: ``` 422 while com._long_prod(sizes) >= 2 ** 63: 423 i = len(sizes) ``` --> 424 while com._long_prod(sizes[:i]) >= 2 *\* 63: 425 i -= 1 The problem is reproducible using http://pandas.pydata.org/pandas-docs/stable/10min.html and running: from pandas import DataFrame, Series import pandas as pd import numpy as np then running lines [97], [98], and [99] in iPython and Python native. I can't see any way to debug or go further.
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3,923
Using cython in pandas tutorial
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"2013-06-21T00:35:45Z"
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CONTRIBUTOR
null
### Please see #3965 for current draft. Re: this topic https://groups.google.com/forum/?fromgroups#!topic/pydata/aLxALYqosOU (cc @jreback). I think this is one of the killer features of pandas so I think merits being in the docs. (I'd definitely be interested in reading it!) Maybe something structured like this with a good example: - write in python first (unit-test, and check for speed, it may be good enough!) - try and rewrite in python to be more efficient (now, it may be good enough!) - profile to work out which part is slow (and needs cython love) - writing and calling a cython function (to do that slow bit faster) I'm not sure what would make a good toy example for this (and I think that choosing a good one is crucial). Thoughts?
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CLN: Replace bare exceptions with more descriptive ones
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"2013-06-16T17:56:52Z"
"2014-06-20T16:24:15Z"
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CONTRIBUTOR
null
This takes care of the low-hanging fruit (really obvious Exception changes), there are still a bunch more to change, but I thought I would split it up into parts and deal with external exceptions before messing with anything that might potentially be raised internally. [I rebased this slightly to remove a few comments - but it did pass previously so it should be fine]
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Access DateTimeIndexed dataframe by timestamp
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"2013-06-17T18:48:57Z"
"2013-06-17T18:48:57Z"
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null
Hello, I am new to pandas and thanks for this great library! I have a data frame like this: ``` Gold_2012.head() open high low close volume date_time 2012-01-02 18:01:00 1571.0 1571.0 1569.1 1569.8 351 2012-01-02 18:02:00 1569.8 1570.0 1569.7 1569.8 54 2012-01-02 18:03:00 1570.0 1570.0 1569.1 1569.9 247 2012-01-02 18:04:00 1570.0 1570.0 1569.8 1569.9 55 2012-01-02 18:05:00 1569.8 1569.9 1568.5 1568.5 48 ``` I am trying to access the first element of this dataframe. If I use loc function, everything works out: ``` Gold_2012.loc[Gold_2012.index[0]] open 1571.0 high 1571.0 low 1569.1 close 1569.8 volume 351.0 Name: 2012-01-02 18:01:00-06:00, dtype: float64 ``` But if I do something like this, an error is thrown. Is this expected? ``` Gold_2012[Gold_2012.index[0]] ``` --- KeyError Traceback (most recent call last) <ipython-input-30-bb7117766fdd> in <module>() ----> 1 Gold_2012[Gold_2012.index[0]] /Users/chen/Virtualenvs/python3Env/lib/python3.3/site-packages/pandas/core/frame.py in **getitem**(self, key) 1926 else: 1927 # get column -> 1928 return self._get_item_cache(key) 1929 1930 def _getitem_slice(self, key): /Users/chen/Virtualenvs/python3Env/lib/python3.3/site-packages/pandas/core/generic.py in _get_item_cache(self, item) 568 return cache[item] 569 except Exception: --> 570 values = self._data.get(item) 571 res = self._box_item_values(item, values) 572 cache[item] = res /Users/chen/Virtualenvs/python3Env/lib/python3.3/site-packages/pandas/core/internals.py in get(self, item) 1382 1383 def get(self, item): -> 1384 _, block = self._find_block(item) 1385 return block.get(item) 1386 /Users/chen/Virtualenvs/python3Env/lib/python3.3/site-packages/pandas/core/internals.py in _find_block(self, item) 1524 1525 def _find_block(self, item): -> 1526 self._check_have(item) 1527 for i, block in enumerate(self.blocks): 1528 if item in block: /Users/chen/Virtualenvs/python3Env/lib/python3.3/site-packages/pandas/core/internals.py in _check_have(self, item) 1531 def _check_have(self, item): 1532 if item not in self.items: -> 1533 raise KeyError('no item named %s' % com.pprint_thing(item)) 1534 1535 def reindex_axis(self, new_axis, method=None, axis=0, copy=True): KeyError: 'no item named 2012-01-02 18:01:00-06:00'
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3,926
Avoid upcasting integers in some merge operations
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MEMBER
null
Reported on mailing list ``` I've noticed that merge does not necessarily retain the datatype of the variables passed. For example, ---- stock = DataFrame({'date' : [2000, 2001, 2002], 'S' : [10.1, 10.5, 11.1]}) ex = DataFrame({'Grant' : [1, 1], 'date' : [2000, 2002]}) merged = stock.merge(ex, how='left', on='date') ---- In merged, the Grant variable has been promoted from int to float. Is this deliberate behavior? ```
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TST: Fix error in assert_produces_warning.
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CONTRIBUTOR
null
When I copied this over and sent to @cpcloud, I thought the indentation was wrong and changed it. Turned out I was wrong -- sorry about that! Now all the doctests pass...
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DOC: Series type int to float upcasting on an apply
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CONTRIBUTOR
null
Add to advanced groupby sections docs This seem a little strange, here the integer column N is upcast when using an apply (since the row (Series) has floats in it), unfortunately in this example this means I get an exception: ``` from numpy.random import * df = pd.DataFrame({'a': randn(100), 'b': randn(100), 'N': randint(10, 100, (100))}) df.dtypes N int64 a float64 b float64 dtype: object def f(x): return x**2-x def integrate_f(a, b, N): s = 0 dx = (b-a)/N for i in range(N): s += f(a+i*dx) return s * dx df.apply(lambda x: integrate_f(x['a'], x['b'], x['N']), axis=1)--------------------------------------------------------------------------- TypeError Traceback (most recent call last) <ipython-input-179-af52228271ac> in <module>() ----> 1 df.apply(lambda x: integrate_f(x['a'], x['b'], x['N']), axis=1) /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pandas/core/frame.pyc in apply(self, func, axis, broadcast, raw, args, **kwds) 4116 return self._apply_raw(f, axis) 4117 else: -> 4118 return self._apply_standard(f, axis) 4119 else: 4120 return self._apply_broadcast(f, axis) /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pandas/core/frame.pyc in _apply_standard(self, func, axis, ignore_failures) 4191 # no k defined yet 4192 pass -> 4193 raise e 4194 4195 TypeError: ('range() integer end argument expected, got numpy.float64.', u'occurred at index 0') ``` The obvious "fix" is to use a dummy column... ahem: ``` df = pd.DataFrame({'x': 'x', 'a': randn(100), 'b': randn(100), 'N': randint(10, 100, (100))}) ``` related #3926
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3,929
PTF no more
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"2014-07-16T08:14:30Z"
"2013-06-17T02:45:06Z"
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The travis network build cache (activated via commit message, for whitelisted commiters) was added a few months back. It worked well for a while, but ultimately it's seen little use in practive by commiters. While it was gratifying to see this actually worked, all the additional magic in ci/ doesn't pay for itself in practice, so I've decided to retire this unless there are strong objections and get a simpler ci/ in return. The build cache system got an upgrade as a side-effect of this work and `scripts/use_build_cache.py` remains a useful bit of kit. Not entirely wasted effort after all. xref https://github.com/pydata/pandas/pull/3383
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17
"2013-06-17T01:37:13Z"
"2014-06-19T03:37:21Z"
"2013-06-19T00:59:39Z"
CONTRIBUTOR
null
this no longer has much to do with #3925, and is only fixing a bug Minor revision to select on second frequency ``` In [11]: df = DataFrame(randn(5,5),columns=['open','high','low','close','volume'],index=date_range('2012-01-02 18:01:00',periods=5,tz='US/Central',freq='s')) In [12]: df Out[12]: open high low close volume 2012-01-02 18:01:00-06:00 0.131243 0.301542 0.128027 0.804162 1.296658 2012-01-02 18:01:01-06:00 0.341487 1.548695 0.703234 0.904201 1.422337 2012-01-02 18:01:02-06:00 -1.050453 -1.884035 1.537788 -0.821058 0.558631 2012-01-02 18:01:03-06:00 0.846885 1.045378 -0.722903 -0.613625 -0.476531 2012-01-02 18:01:04-06:00 1.186823 -0.018299 -0.513886 -1.103269 -0.311907 In [14]: df['2012-01-02 18:01:02'] Out[14]: open high low close volume 2012-01-02 18:01:02-06:00 -1.050453 -1.884035 1.537788 -0.821058 0.558631 ```
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dataframe asfreq modifies the colums dtype
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"2013-06-17T05:54:12Z"
"2013-07-10T18:18:21Z"
"2013-07-10T18:18:21Z"
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A dataframe like this, volume column is of type int64. ``` print(Gold_2012.head(), "\n") print(Gold_2012) open high low close volume date_time 2012-01-02 18:01:00 1571.0 1571.0 1569.1 1569.8 351 2012-01-02 18:02:00 1569.8 1570.0 1569.7 1569.8 54 2012-01-02 18:03:00 1570.0 1570.0 1569.1 1569.9 247 2012-01-02 18:04:00 1570.0 1570.0 1569.8 1569.9 55 2012-01-02 18:05:00 1569.8 1569.9 1568.5 1568.5 48 <class 'pandas.core.frame.DataFrame'> DatetimeIndex: 351367 entries, 2012-01-02 18:01:00 to 2012-12-31 17:15:00 Data columns (total 5 columns): open 351367 non-null values high 351367 non-null values low 351367 non-null values close 351367 non-null values volume 351367 non-null values dtypes: float64(4), int64(1) ``` However, after Gold_2012.asfreq(pd.offsets.Minute()) It becomes: ``` <class 'pandas.core.frame.DataFrame'> DatetimeIndex: 524115 entries, 2012-01-02 18:01:00 to 2012-12-31 17:15:00 Freq: T Data columns (total 5 columns): open 351367 non-null values high 351367 non-null values low 351367 non-null values close 351367 non-null values volume 351367 non-null values dtypes: float64(5) ``` The volume column becomes dtype of float64. system: ``` Panadas version: 0.11.0 Numpy version: 1.7.1 Matplotlib version: 1.2.1 Python version: 3.3.1 (default, May 12 2013, 21:14:39) [GCC 4.2.1 Compatible Apple Clang 4.0 (tags/Apple/clang-418.0.60)] ```
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Breakpoint analysis feature in Pandas
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5
"2013-06-17T10:46:24Z"
"2016-07-24T04:10:17Z"
"2016-07-24T04:10:11Z"
NONE
null
Hi, as far as I know, pandas does not support yet the analysis of time series homogeneity and the detection of breakpoints. Would be really great if such a feature could be implemented. What I am thinking about is similar to the following R-project, called bfast (http://bfast.r-forge.r-project.org/). Would be great if some people would be interested in this. Alex
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CLN: cleaned up _try_cast in core/groupby.py to eliminate cruft (GH3920)
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null
raised on #3920
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3,935
FIX: StataReader
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9
"2013-06-17T14:05:37Z"
"2014-07-16T08:14:39Z"
"2013-06-21T00:11:15Z"
CONTRIBUTOR
null
Fix for a bug in StataReader resulting in errors when reading Stata file with string columns
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BUG: fix python3/2 numpy import_array macro build issue with clang
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8
"2013-06-17T19:28:06Z"
"2014-06-21T19:34:31Z"
"2013-06-17T20:22:52Z"
MEMBER
null
closes #3872. no really, it does.
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allow HDFStore to remain open when TableIterator is returned from read_hdf
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12
"2013-06-17T19:45:39Z"
"2014-07-16T08:14:42Z"
"2013-06-18T22:15:20Z"
NONE
null
Hi, I'm using a TableIterator from pandas.read_hdf function (with the keyword argument iterator=True), I am unable to retrieve any data due to the error "ClosedNodeError: the node object is closed". For instance: ``` pandas.DataFrame({'a':[1,2,3], 'b':[4,5,6]}).to_hdf("test.h5", "test", append=True) it = pandas.read_hdf("test.h5","test",iterator=True) iter(it).next() Traceback (most recent call last): File "<ipython-input-22-5634d86698ab>", line 1, in <module> iter(it).next() File "/usr/local/lib/python2.7/site-packages/pandas/io/pytables.py", line 912, in __iter__ v = self.func(current, stop) ... File "/usr/local/lib/python2.7/site-packages/tables/node.py", line 355, in _g_check_open raise ClosedNodeError("the node object is closed") ClosedNodeError: the node object is closed ``` I looked through source code of panda.io.pytables and found that in the get_store function, store.close() is always run when read_hdf returns, even if it returns an TableIterator. My assumption is that store should remain open in order for TableIterator to work. Can you please let me know if this fix is acceptable, or is there an easier way to do this? Thanks, Sean
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DOC: expand section on partial string indexing of timeseries
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0
"2013-06-17T22:34:24Z"
"2013-06-18T00:42:28Z"
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CONTRIBUTOR
null
see #3931 http://pandas.pydata.org/pandas-docs/dev/timeseries.html#datetimeindex could use examples of increasing specialized partial string indexing and especially issues of end inclusion (eg #3905)
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DOC: partial string indexing docs in timeseries.rst (GH3938)
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2
"2013-06-17T23:41:32Z"
"2014-06-14T06:04:28Z"
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CONTRIBUTOR
null
closes #3938
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note "Pandas install from source error" in documentation when using mingw
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9
"2013-06-18T01:26:02Z"
"2014-02-20T21:23:17Z"
"2014-02-20T21:23:17Z"
NONE
null
Installing on Windows with MinGW installed. Pandas Version: Installing from source NumPy Version : `1.7.1` After running `setup.py install` I get this error: ``` cc1.exe: error: unrecognized command line option '-mno-cygwin' error: command 'gcc' failed with exit status 1 ``` I believe I've installed MinGW correctly. Is this a problem with Pandas or MinGW? Terminal output: ``` C:\Python27\Lib\site-packages\pandas>setup.py install running install running bdist_egg running egg_info writing requirements to pandas.egg-info\requires.txt writing pandas.egg-info\PKG-INFO writing top-level names to pandas.egg-info\top_level.txt writing dependency_links to pandas.egg-info\dependency_links.txt reading manifest file 'pandas.egg-info\SOURCES.txt' reading manifest template 'MANIFEST.in' warning: no files found matching 'TODO.rst' warning: no files found matching 'setupegg.py' no previously-included directories found matching 'doc\build' warning: no previously-included files matching '*.so' found anywhere in distribution warning: no previously-included files matching '*.pyd' found anywhere in distribution warning: no previously-included files matching '*.pyc' found anywhere in distribution warning: no previously-included files matching '.DS_Store' found anywhere in distribution warning: no previously-included files matching '*.png' found anywhere in distribution writing manifest file 'pandas.egg-info\SOURCES.txt' installing library code to build\bdist.win-amd64\egg running install_lib running build_py copying pandas\version.py -> build\lib.win-amd64-2.7\pandas running build_ext skipping 'pandas\index.c' Cython extension (up-to-date) building 'pandas.index' extension C:\MinGW\bin\gcc.exe -mno-cygwin -mdll -O -Wall -Ipandas/src/klib -Ipandas/src - IC:\Python27\lib\site-packages\numpy\core\include -IC:\Python27\include -IC:\Pyt hon27\PC -c pandas\index.c -o build\temp.win-amd64-2.7\Release\pandas\index.o cc1.exe: error: unrecognized command line option '-mno-cygwin' error: command 'gcc' failed with exit status 1 ```
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ENH: add last element to repring of sequences
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3,942
Add key to sorting functions
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"2020-04-27T16:09:26Z"
"2020-04-27T16:09:26Z"
CONTRIBUTOR
null
Many python functions (sorting, max/min) accept a key argument, perhaps they could in pandas too. . _The terrible motivating example was this awful hack from [this question](http://stackoverflow.com/a/17157110/1240268).... for which maybe one could do_ ``` df.sort_index(key=lambda t: literal_eval(t[1:-1])) ``` _This would still be an awful awful hack, but a slightly less awful one_.
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3,943
Making categoricals comparable
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"2014-07-14T21:42:11Z"
"2014-07-14T21:42:11Z"
CONTRIBUTOR
null
another example: http://stackoverflow.com/questions/23814368/sorting-pandas-categorical-labels-after-groupby At the moment bins / buckets are simply strings, so you can't sort them properly. ``` A=pd.qcut(X['x'], [0,0.25,0.5,0.75,1.0]) In [28]: A[0] Out[28]: '(0.635, 2.4]' In [29]: type(A[0]) Out[29]: str ``` The dtype of the Index is object (because these are strings), maybe we could just have these as a subclass of strings where: ``` def __lt__(self, other): from ast import literal_eval return literal_eval(self) < literal_eval(other) ``` Can put together pr if seems reasonable.
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API/BUG: inconsistent return in Timestamp/to_datetime for current year
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"2013-06-18T11:22:42Z"
"2014-04-25T12:57:40Z"
"2014-02-04T09:24:55Z"
CONTRIBUTOR
null
after #3890, still unresolved / inconsistent non-trivial to fix, so pushing to 0.12 ``` In [14]: Timestamp('2012') Out[14]: Timestamp('2012-06-18 00:00:00', tz=None) In [15]: to_datetime('2012') Out[15]: Timestamp('2012-01-01 00:00:00', tz=None) ``` ``` In [17]: pd.date_range('2014', '2015', freq='M') Out[17]: <class 'pandas.tseries.index.DatetimeIndex'> [2014-04-30, ..., 2015-03-31] Length: 12, Freq: M, Timezone: None ```
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ENH: Add Series.histogram()
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13
"2013-06-18T12:35:55Z"
"2013-08-27T00:07:49Z"
"2013-08-27T00:07:49Z"
CONTRIBUTOR
null
Should I write a `Series.histogram` that calls `numpy.histogram` and returns a new Series of counts indexed by bins? ``` In [4]: s = Series(randn(100)) In [5]: counts, bins = np.histogram(s) In [6]: Series(counts, index=bins[:-1]) Out[6]: -2.968575 1 -2.355032 4 -1.741488 5 -1.127944 26 -0.514401 23 0.099143 23 0.712686 12 1.326230 5 1.939773 0 2.553317 1 dtype: int32 ``` ...would be accomplished by... ``` Series.histogram() ``` which would accept at the arguments that `np.histogram` accepts (e.g., choosing bins manually, specifying number or range of bins, etc.). from http://stackoverflow.com/a/17150734/1221924 The proposed method doesn't save all that much typing, but it would help users discover this convenient way of storing a histogram. Proceed?
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MDExOlB1bGxSZXF1ZXN0NjM4Nzc4NA==
3,946
ENH: update bundled ujson to latest v1.33
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31
"2013-06-18T14:12:54Z"
"2014-07-04T07:35:19Z"
"2013-06-19T01:46:00Z"
CONTRIBUTOR
null
This updates pandas JSON to use the latest ujson version. A fair few fixes and enhancements are included. Unfortunately however there were a lot of whitespace changes so it looks like a lot more than it actually is. All tests pass on py27 and py33. Valgrind run of JSON tests with Python 2.7 is clean. Also included are two fixes encountered during merging and pushed upstream to ultrajson: https://github.com/esnme/ultrajson/pull/93 https://github.com/esnme/ultrajson/pull/94
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3,947
Add all optional dependencies to tox config
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null
3
"2013-06-18T16:48:16Z"
"2013-12-04T00:56:16Z"
"2013-06-22T00:00:16Z"
MEMBER
null
Easy enough just want to see if there's any reason not to do this. Obviously will increase build time on initial caching but when working on a feature that needs these tox is not that useful if they are not installed.
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3,948
CLN/ENH: consolidate tox
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null
1
"2013-06-18T18:21:43Z"
"2013-07-25T03:52:47Z"
"2013-06-21T23:12:54Z"
MEMBER
null
closes #3947.
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3,949
ENH: enable support for iterator with read_hdf in HDFStore (GH3937)
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13
"2013-06-18T22:05:48Z"
"2014-07-01T10:07:30Z"
"2013-06-18T22:57:40Z"
CONTRIBUTOR
null
closes #3937 DOC: update v0.11.1.rst
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3,950
tz info lost when creating multiindex
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10
"2013-06-18T23:46:13Z"
"2014-07-23T22:09:51Z"
"2014-06-21T20:10:21Z"
CONTRIBUTOR
null
see http://stackoverflow.com/questions/17159207/change-timezone-of-date-time-column-in-pandas-and-add-as-hierarchical-index/17159276#17159276 ``` dat = pd.DataFrame({'label':['a', 'a', 'a', 'b', 'b', 'b'], 'datetime':['2011-07-19 07:00:00', '2011-07-19 08:00:00', '2011-07-19 09:00:00', '2011-07-19 07:00:00', '2011-07-19 08:00:00', '2011-07-19 09:00:00'], 'value':range(6)}) dat.index = pd.to_datetime(dat.pop('datetime'), utc=True) dat.index = dat.index.tz_localize('UTC').tz_convert('US/Pacific') dat label value datetime 2011-07-19 00:00:00-07:00 a 0 2011-07-19 01:00:00-07:00 a 1 2011-07-19 02:00:00-07:00 a 2 2011-07-19 00:00:00-07:00 b 3 2011-07-19 01:00:00-07:00 b 4 2011-07-19 02:00:00-07:00 b 5 ``` If we add another index (we lose the tz): ``` In [14]: dat.set_index('label', append=True).swaplevel(0, 1) Out[14]: value label datetime a 2011-07-19 07:00:00 0 2011-07-19 08:00:00 1 2011-07-19 09:00:00 2 b 2011-07-19 07:00:00 3 2011-07-19 08:00:00 4 2011-07-19 09:00:00 5 ```
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15,721,343
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3,951
doc/source/visualization.rst links to missing image files
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Here is the doc build log: ``` /tmp/pandas/doc/source/visualization.rst:None: WARNING: image file not readable: _static/series_plot_basic2.png /tmp/pandas/doc/source/visualization.rst:None: WARNING: image file not readable: _static/frame_plot_basic_noleg.png /tmp/pandas/doc/source/visualization.rst:None: WARNING: image file not readable: _static/frame_plot_subplots.png /tmp/pandas/doc/source/visualization.rst:None: WARNING: image file not readable: _static/series_plot_logy.png /tmp/pandas/doc/source/visualization.rst:None: WARNING: image file not readable: _static/df_plot_xy.png /tmp/pandas/doc/source/visualization.rst:None: WARNING: image file not readable: _static/series_plot_secondary_y.png /tmp/pandas/doc/source/visualization.rst:None: WARNING: image file not readable: _static/frame_plot_secondary_y.png /tmp/pandas/doc/source/visualization.rst:None: WARNING: image file not readable: _static/frame_plot_secondary_y_no_right.png /tmp/pandas/doc/source/visualization.rst:None: WARNING: image file not readable: _static/ser_plot_suppress.png /tmp/pandas/doc/source/visualization.rst:None: WARNING: image file not readable: _static/ser_plot_suppress_parm.png /tmp/pandas/doc/source/visualization.rst:None: WARNING: image file not readable: _static/ser_plot_suppress_context.png ```
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API: make default errors='raise' in to_datetime (from 'ignore')
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"2013-06-19T01:04:17Z"
"2013-09-22T17:09:29Z"
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CONTRIBUTOR
null
see #3944 currently the default is 'ignore', which returns the input argument (rather than raise, say a `ValueError`); various routines will try a conversion (which will result in a conversion or no effect), then move on; rather than raising (and having to catch it) so investigate....
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Doc for pandas.io.data
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CLN: Replace bare exceptions with more descriptive ones
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"2014-03-11T02:19:02Z"
"2014-03-11T02:19:02Z"
CONTRIBUTOR
null
I'm moving this to an issue so it's easier to track and I can split into separate, smaller, pull requests. (previously was #3924). For right now, the goal is to take care of the low-hanging fruit (the really obvious items that should be TypeError, ValueError, etc.) and then potentially take on more of the code base later. Packages/Files where exceptions have been changed (will be checked off once test cases are edited for them) - [x] `merge` - [x] `stats/common` - [x] `tools/tile` - [x] `core/common` - [x] `core/format` - [x] `core/frame` - [x] `pandas/sparse` - [x] `pandas/tseries` - [ ] `core/internals` - [x] `core/index` - [ ] `core/panel` - [ ] `core/series` - [ ] `core/panelnd` - [ ] `rpy/common` - [x] `io/excel` More to come...
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BLD: Tweak to Makefile.
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"2013-06-19T03:46:35Z"
"2014-06-19T19:20:54Z"
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CONTRIBUTOR
null
Relates to #3954. In addition to changing exceptions types returned to be more explicit, this pull incorporates the following changes: 1. Adds a new `assertRaisesRegexp` to `util/testing.py` to port the `assertRaisesRegexp` helper from 2.7+ unittest 2. Cleans up stats/common. 3. Fix up initial assertions in `tseries.offset._cached_range` that were all off + fix the test cases which were all just raising TypeErrors because they were calling with the wrong arguments. 4. Changes the example timezone from Asia/Beijing to Asia/Hong+Kong b/c `Asia/Beijing` is not supported by pytz. 5. Any tz-aware : tz-naive comparison fails with TypeError, as will mismatched, localize, etc. calls. 6. Changes `SparseArray` indexing error messages to match tuple message for completeness. 7. Improves the window check in ols. After you all say it's okay to merge, I'll update the docs to reflect changes.
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Building latest master fails in Anaconda Python 3.3 environment on RedHat
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26
"2013-06-19T07:15:48Z"
"2013-06-19T17:30:27Z"
"2013-06-19T16:48:59Z"
NONE
null
Checked out a2a7a5f85dd25f05f7d3b813d15dc0f1ecc45fa2, `python3 setup.py build` fails with: ``` gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -fPIC -Ipandas/src/ujson/python -Ipandas/src/ujson/lib -Ipandas/src/datetime -Ipandas/src/klib -Ipandas/src -I/home/me/anaconda/envs/py33/lib/python3.3/site-packages/numpy/core/include -I/home/me/anaconda/envs/py33/include/python3.3m -c pandas/src/ujson/lib/ultrajsonenc.c -o build/temp.linux-x86_64-3.3/pandas/src/ujson/lib/ultrajsonenc.o gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -fPIC -Ipandas/src/ujson/python -Ipandas/src/ujson/lib -Ipandas/src/datetime -Ipandas/src/klib -Ipandas/src -I/home/me/anaconda/envs/py33/lib/python3.3/site-packages/numpy/core/include -I/home/me/anaconda/envs/py33/include/python3.3m -c pandas/src/ujson/lib/ultrajsondec.c -o build/temp.linux-x86_64-3.3/pandas/src/ujson/lib/ultrajsondec.o pandas/src/ujson/lib/ultrajsondec.c: In function ‘decode_numeric’: pandas/src/ujson/lib/ultrajsondec.c:119: error: ‘LLONG_MAX’ undeclared (first use in this function) pandas/src/ujson/lib/ultrajsondec.c:119: error: (Each undeclared identifier is reported only once pandas/src/ujson/lib/ultrajsondec.c:119: error: for each function it appears in.) pandas/src/ujson/lib/ultrajsondec.c:125: error: ‘LLONG_MIN’ undeclared (first use in this function) error: command 'gcc' failed with exit status 1 ``` NB: Building da14c6e857fd1fc7875cd552779a6063ec9e4ddc worked fine yesterday on Ubuntu 12.04, otherwise the same environment
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MDU6SXNzdWUxNTc0MTczMg==
3,958
BLD: add shiningpanda integration for windows builds?
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22
"2013-06-19T12:26:59Z"
"2014-01-14T17:53:12Z"
"2014-01-14T17:53:12Z"
CONTRIBUTOR
null
https://www.shiningpanda-ci.com/
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MDExOlB1bGxSZXF1ZXN0NjQxNzYyMg==
3,959
BUG/BLD: add compiler flag for older compilers
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1
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"2014-07-11T21:47:26Z"
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MEMBER
null
The -D_GNU_SOURCE is needed by older versions of GCC. Many newer versions enable this flag by default, which is why it wasn't being caught before. closes #3957.
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3,960
ENH: nlargest for DataFrame
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34
"2013-06-19T15:43:06Z"
"2016-10-12T23:03:54Z"
"2014-05-14T21:21:48Z"
CONTRIBUTOR
null
I don't _think_ there is a way to get the nlargest elements in a DataFrame without sorting. In ordinary python you'd use heapq's nlargest (and we can hack a bit to use it for a DataFrame): ``` In [10]: df Out[10]: IP Agent Count 0 74.86.158.106 Mozilla/5.0+(compatible; UptimeRobot/2.0; http... 369 1 203.81.107.103 Mozilla/5.0 (Windows NT 6.1; rv:21.0) Gecko/20... 388 2 173.199.120.155 Mozilla/5.0 (compatible; AhrefsBot/4.0; +http:... 417 3 124.43.84.242 Mozilla/5.0 (Windows NT 6.2) AppleWebKit/537.3... 448 4 112.135.196.223 Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.3... 454 5 124.43.155.138 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:21.0) G... 461 6 124.43.104.198 Mozilla/5.0 (Windows NT 5.1; rv:21.0) Gecko/20... 467 In [11]: df.sort('Count', ascending=False).head(3) Out[11]: IP Agent Count 6 124.43.104.198 Mozilla/5.0 (Windows NT 5.1; rv:21.0) Gecko/20... 467 5 124.43.155.138 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:21.0) G... 461 4 112.135.196.223 Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.3... 454 ``` ``` In [21]: from heapq import nlargest In [22]: top_3 = nlargest(3, df.iterrows(), key=lambda x: x[1]['Count']) In [23]: pd.DataFrame.from_items(top_3).T Out[23]: IP Agent Count 6 124.43.104.198 Mozilla/5.0 (Windows NT 5.1; rv:21.0) Gecko/20... 467 5 124.43.155.138 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:21.0) G... 461 4 112.135.196.223 Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.3... 454 ``` This is much slower than sorting, presumbly from the overhead, I thought I'd throw this as a feature idea anyway. see http://stackoverflow.com/a/17194717/1240268
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DOC/CLN: remove gh links and use the new issue format for whatsnew
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80
"2013-06-19T16:14:32Z"
"2014-06-20T21:52:48Z"
"2013-06-20T18:10:16Z"
MEMBER
null
closes #3182.
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15,757,936
MDU6SXNzdWUxNTc1NzkzNg==
3,962
Make DataFrame.pivot index argument truly optional
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0
"2013-06-19T17:36:36Z"
"2015-07-31T11:14:36Z"
"2015-07-31T11:14:36Z"
CONTRIBUTOR
null
Creating a pivot table from a DataFrame is easy. ``` python In [17]: df Out[17]: date variable value 0 2000-01-03 00:00:00 A 0.528219 1 2000-01-04 00:00:00 A -0.135071 2 2000-01-05 00:00:00 A -0.343018 3 2000-01-03 00:00:00 B -0.097701 4 2000-01-04 00:00:00 B -1.383248 In [18]: df.pivot('date', 'variable', 'value') Out[18]: variable A B date 2000-01-03 0.528219 -0.097701 2000-01-04 -0.135071 -1.383248 2000-01-05 -0.343018 NaN ``` However if the index has been set, and there is no column to be set as index, pivot fails. From api point of view, the `index` argument is optional, but in fact it is not. ``` python In [19]: df.set_index('date', inplace=True) In [20]: df Out[20]: variable value date 2000-01-03 A 0.528219 2000-01-04 A -0.135071 2000-01-05 A -0.343018 2000-01-03 B -0.097701 2000-01-04 B -1.383248 In [21]: df.pivot(columns='variable', values='value') --------------------------------------------------------------------------- KeyError Traceback (most recent call last) ... KeyError: u'no item named None' ``` Of course one can reset the index before using pivot. ``` python In [22]: df.reset_index().pivot('date', 'variable', 'value') Out[22]: variable A B date 2000-01-03 0.528219 -0.097701 2000-01-04 -0.135071 -1.383248 2000-01-05 -0.343018 NaN ```
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BUG: python 3 compression and read_fwf
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6
"2013-06-19T21:12:19Z"
"2016-10-12T23:03:54Z"
"2013-09-14T01:59:59Z"
CONTRIBUTOR
null
Getting a `TypeError: Type str doesn't support the buffer API` when using `read_fwf` on a compressed file with python 3 only; works in python 2.7 Example: with a file `fwf.bug.txt` like ``` 1111111111 2222222222 3333333333 4444444444 ``` ``` python import pandas as pd print(pd.__version__) widths = [5, 5] !gzip -d fwf_bug.txt df = pd.read_fwf('fwf_bug.txt', widths=widths, names=['one', 'two']) print(df) !gzip fwf_bug.txt # python 3 throws an error here. df2 = pd.read_fwf('fwf_bug.txt.gz', widths=widths, names=['one', 'two'], compression='gzip') print(df2) ``` Versions: python3: `0.11.1.dev-4d06037` should be most recent python2: `0.11.1.dev-3ebfef9` I can paste the full traceback if you'd like.
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3,964
Plotting using subplots
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3
"2013-06-19T23:01:28Z"
"2014-12-07T15:42:17Z"
"2014-12-07T15:42:17Z"
CONTRIBUTOR
null
I am creating the attached plot like this: ``` python fig, axes = subplots(3,3, sharex=True, sharey=True) for ch in range(1,7): axis = axes.flatten()[ch-1] cols = some code to map ch to col_names df[cols].plot(ax=axis) # do the same for 3 more channels with different IDs for ch in range(1,4): axis = axes.flatten()[ch-1+6] cols = some code to map ch to col_names, slightly different to above df[cols].plot(ax=axis) ``` I have 2 problems with the result: 1. sharex does not seem to work for time axes 2. The last major x-ticklabel of the last row of axes is 10:00, while for the first 2 rows it is 9:00. I confirmed that all columns have data in the last row (index = 2011-04-02 10:00:00.718000) and not NaN which would have been excluded in the plot, potentially. Possibly the 2 probs are related? ![all_thermal_channels](https://f.cloud.github.com/assets/69774/678376/2f81c2a0-d933-11e2-9d9e-d98d30e04822.png)
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ENH add cython tutorial
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CONTRIBUTOR
null
WIP #3923 Please checkout this draft for a pandas cython tutorial, any feedback or ideas appreciated. _Thanks to @cpcloud for patiently working out/explaining how to force ipython sphinx directive to play nicely with %%cython (it's incredibly sensitive!) and fixing the spacing bug. This seems to build now._ :)
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API: bool dtype casts to object arrays with np.array
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"2013-06-20T01:51:06Z"
"2015-01-26T01:06:18Z"
"2015-01-26T01:06:18Z"
CONTRIBUTOR
null
Bug? Did this used to work? ``` np.array(pandas.DataFrame.from_dict(dict(a=np.random.rand(50), b=np.random.randint(2, size=50).astype(bool)))) ``` We would expect that this casts to a plain float ndarray. See https://github.com/statsmodels/statsmodels/issues/880
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read_csv with iterator=True does not seem to work as expected without chunksize
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"2013-06-20T08:03:57Z"
"2013-06-21T12:20:03Z"
"2013-06-21T01:22:33Z"
CONTRIBUTOR
null
Hi there, I tested: ``` python data = """A,B,C foo,1,2,3 bar,4,5,6 baz,7,8,9 """ reader = pd.read_csv(StringIO(data), iterator=True) ``` I thought that I could do: ``` for row in reader: print(row) ``` since `reader` is iterable. Unfortunately, it calls the generator `TextFileReader.__iter__`: ``` python def __iter__(self): try: while True: yield self.read(self.chunksize) except StopIteration: pass ``` where `self.chunksize` is `None`. Maybe set `self.chunsize` to 1 when it's not defined and there is `iterator=True`. I'll propose a patch as soon as possible --- today or tomorrow. Best regards, Damien G.
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Bad grammar in exception message: "If use all scalar values, must pass index"
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1
"2013-06-20T13:55:35Z"
"2013-06-20T19:27:10Z"
"2013-06-20T19:26:50Z"
CONTRIBUTOR
null
I found this little gem here: ``` File ".....lib/python2.7/site-packages/pandas/core/frame.py" in extract_index 5366. raise ValueError('If use all scalar values, must pass index') Exception Type: ValueError at /reporting/reports/7/preview Exception Value: If use all scalar values, must pass index ``` Just wanted to point that out. It's not urgent or very grave.
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Series astype() doesn't convert int64 to datetime64 using M8[D] anymore
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"2014-03-27T17:44:26Z"
"2013-06-21T00:10:18Z"
CONTRIBUTOR
null
add `units='D'` to `Timestamp/to_datetime` epoch support I have an int64 series representing days since epoch which I'd like to convert to datetime64. This works in 11.0 but raises an exception in 0.11.1.dev-964516a. The exception message is "TypeError: cannot convert datetimelike to dtype [datetime64[D]]". ``` import pandas as pd s = pd.Series([0,1,2]) print s.astype('M8[D]') ``` My workaround is: ``` import pandas as pd s = pd.Series([0,1,2]) print pd.Series(s.values.astype('M8[D]')) ```
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Strange behavior assigning values to elements
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"2013-12-04T00:46:05Z"
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NONE
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Basically, if you create a Data ``` python import pandas as pd df = pd.DataFrame({ "aa":range(5), "bb":[2.2]*5}) df["cc"] = 0.0 # remove this line, it works ck = [True]*len(df) df["bb"].iloc[0] = .13 df_tmp = df.iloc[ck] # or remove this line and it'll work df["bb"].iloc[0] = .15 # doesn't happen print df ``` which gives: ``` aa bb cc 0 0 0.13 0 1 1 2.20 0 2 2 2.20 0 3 3 2.20 0 4 4 2.20 0 ``` Very strange. Specs: ``` pd.version.version Out[5]: '0.11.0' np.version.version Out[7]: '1.7.1' ```
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Series.where return unmodified series in upcasting corner case
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"2013-06-20T16:08:42Z"
"2013-09-22T17:13:54Z"
"2013-09-22T17:13:54Z"
CONTRIBUTOR
null
``` python import pandas as pd import numpy as np s = pd.Series(range(10)) s.where(s > 4, np.array([np.nan])) Out[4]: 0 0 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 dtype: int64 ``` The culprit is that if upcast is required, ser doesn't get changed in the `com` call. Since we're making a copy of self anyways, shouldn't we always pass in change? ``` python change = ser if inplace else None com._maybe_upcast_putmask(ser,~cond,other,change=change) ``` I didn't hit this organically and I'm assuming it's a fairly contrived example. Was just reading code and found this.
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3,972
CLN: fix grammar in extract_index error message
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2
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MEMBER
null
closes #3968.
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3,973
ENH (GH3969) Implement unit='D' in to_datetime
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"2013-06-20T21:45:00Z"
"2014-06-27T23:18:38Z"
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CONTRIBUTOR
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closes #3969
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3,974
ENH: print more detailed truncated sequence if a limit is given
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"2014-07-17T06:09:18Z"
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MEMBER
null
works similar to numpy except that the edgeitems is overriden by threshold rather than the other way around which is what np does. closes #3391 - [x] add release notes
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DOC: put release notes link to dev until 0.11.1 is released
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2
"2013-06-20T23:40:53Z"
"2013-07-24T23:42:09Z"
"2013-07-24T23:42:01Z"
MEMBER
null
should change this back to stable when stable becomes 0.11.1.
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3,977
BUG: Possibly invalidate the item_cache when numpy implicty converts a v...
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12
"2013-06-21T00:00:43Z"
"2013-06-28T17:58:04Z"
"2013-06-28T17:58:04Z"
CONTRIBUTOR
null
closes #3970 `df['bb'].iloc[0] = 0.13` here `bb` is put into the `_item_cache` and the first element assigned 0.13; `bb` is still a view onto the frame block `df_tmp = df.iloc[[True]*len(df)]` `df_tmp` is now a copy of df, but built up as a take block-by-block from `df`. I believe numpy then decides to invalidate the views to the memory in the float block (why I have no idea); `bb` in `df` is still holding the view in the `_item_cache` to the old memory location. `df['bb'].iloc[0] = 0.15` grabs `bb` from the cache and assigns 0.15 to it, BUT it is not longer a view onto the float block in `df` so nothing appears to get updated I tried 2 fixes: 1) when getting an item from the `_item_cache` check if its a view of the underlying data - this works, but makes lookups way slow 2) clear the cache when `taking` ON THE ORIGINAL frame, so future lookups will cache-miss and get the correct data from the block manager Fundamentally we COULD do this in the first statement `df['bb'].iloc[0] = 0.13`, where we don't reset the cache, except we don't have a reference to df (well we do, but by the time the operation is carried out we have an operation on the series, so have lost the frame reference) So this is fixed in this case, but not sure what other numpy ops implicity convert view-> copy (and we are holding onto the cached view).
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BUG (GH3967) csv parsers would loop infinitely if iterator=True but no chunksize specified
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0
"2013-06-21T01:00:15Z"
"2014-07-10T21:01:57Z"
"2013-06-21T01:22:34Z"
CONTRIBUTOR
null
BUG: python parser failing with `chunksize=1` closes #3967
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15,831,422
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3,979
Selections on an empty dataframe drop all columns
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2
"2013-06-21T01:14:45Z"
"2013-07-10T19:13:21Z"
"2013-07-10T19:13:21Z"
NONE
null
Here's an example: ``` python In [1]: pd.DataFrame(columns=['a', 'b']) Out[1]: Empty DataFrame Columns: [a, b] Index: [] ``` Right now, dropping a column works: ``` python In [2]: df.drop('a', 1) Out[2]: Empty DataFrame Columns: [b] Index: [] ``` But if I do a selection first, I'll be in trouble - selection returns an empty DF: ``` python In [3]: df[df.b] Out[3]: Empty DataFrame Columns: [] Index: [] ``` If I've done the selection, everything breaks: ``` python In [4]: df[df.b].drop('a') --------------------------------------------------------------------------- ValueError Traceback (most recent call last) <ipython-input-5-befe906574d9> in <module>() ----> 1 df.drop('a') /Users/spencer/src/pandas/pandas/core/generic.pyc in drop(self, labels, axis, level) 365 new_axis = axis.drop(labels, level=level) 366 else: --> 367 new_axis = axis.drop(labels) 368 dropped = self.reindex(**{axis_name: new_axis}) 369 try: /Users/spencer/src/pandas/pandas/core/index.pyc in drop(self, labels) 1239 mask = indexer == -1 1240 if mask.any(): -> 1241 raise ValueError('labels %s not contained in axis' % labels[mask]) 1242 return self.delete(indexer) 1243 ValueError: labels ['b'] not contained in axis ``` Yeah, this actually comes up for me, particularly in scripts that have a series of steps like fetch data, stick it in a dataframe, munge it, and then do stuff. An example: ``` python def fetch_data_from_external_api(): raw_data = api.request(...) return pd.DataFrame(raw_data, columns=['timestamp', 'site_was_alive', 'val']) def split_by_site_up(df): down = df[~df.site_was_alive].drop('site_was_alive', 1) up = df[df.site_was_alive].drop('site_was_alive', 1) return down, up def get_data_and_split(): df = fetch_data_from_external_api() down, up = split_by_site_up(df) down.val.plot() ``` Normally, this'll be fine. But what if the external api responds with an empty dataset for some reason? Or what if `df[~df.site_was_alive]` is empty, because the site was always alive? It seems weird that this breaks because selections that return empty dataframes lose all the column metadata. I have to write some ugly "if not empty" type code :(
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DOC: Flesh out the R comparison section of docs
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"2013-06-21T01:25:19Z"
"2014-01-07T13:43:02Z"
"2014-01-07T13:43:02Z"
CONTRIBUTOR
null
I guess quite a lot of people come from an R background, and perhaps a good material would be a conversion table for pandas vs R functions/idioms etc. in http://pandas.pydata.org/pandas-docs/dev/comparison_with_r.html Perhaps this site could offer some functions to consider including: http://www.statmethods.net/management/variables.html
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TST: Multiple network tests fail to check that network result was successful.
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4
"2013-06-21T02:23:14Z"
"2013-12-04T01:18:11Z"
"2013-07-05T17:08:59Z"
CONTRIBUTOR
null
Under test_google, the test_multi\* methods are not checking to see result is successful. Test get quote for yahoo also needs to check that result is None. We should also consider mocking the network object to raise URLErrors to make sure that network methods all handle them appropriately (ie they should raise the URLError unless they explicitly specify otherwise. I can do fixes to test cases, just want to remember because you don't see it unless no wifi @cpcloud I'm guessing the really long request issue is because some of the test_google tests are overly ambitious and want to grab more data when probably smaller amount would work.
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yahoo test error connection reset
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"2013-06-21T20:15:34Z"
"2013-06-28T14:22:33Z"
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MEMBER
null
we really need to fix this... https://travis-ci.org/cpcloud/pandas/jobs/8321921 https://travis-ci.org/cpcloud/pandas/jobs/8322345 https://travis-ci.org/jreback/pandas/jobs/8448538 https://travis-ci.org/pydata/pandas/jobs/8449118 (HTTP error here)
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BUG: wraparound of int64
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"2013-06-21T20:15:53Z"
"2016-09-30T12:35:16Z"
"2016-09-29T22:32:24Z"
CONTRIBUTOR
null
This is dealing with a wrap-around on int64 occurs only on some platforms (macosx) and only on certain installs pandas has to be aware to deal in certain looping constructs (see #3922) ``` np.iinfo(np.int64).max 9223372036854775807 2**63 -9223372036854775808 ```
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Sorting by multiple levels
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3
"2013-06-21T20:54:58Z"
"2014-05-02T12:51:32Z"
"2014-05-02T12:51:32Z"
CONTRIBUTOR
null
At the moment, you can use `sortlevel` to select one level to sort by and then "Data will be lexicographically sorted by the chosen level followed by the other levels (in order)" Should this be the case? Should we be able to specify multiple levels to sort by? see http://stackoverflow.com/questions/17242970/multi-index-sorting-in-pandas
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BUG/TST: catch socket.error in py2/3.2 and ConnectionError in py3.3
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"2014-06-13T07:41:23Z"
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MEMBER
null
closes #3982.
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MDExOlB1bGxSZXF1ZXN0NjQ4MTQxMQ==
3,986
BUG: Index shift drops index name
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"2014-07-15T16:07:40Z"
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CONTRIBUTOR
null
``` >>> idx = pd.Index([pd.to_datetime('2013-06-21')], name='idx') >>> idx.name 'idx' >>> idx.shift(1, freq='B').name == None True ```
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3,987
TST/BUG: fix MANIFEST.in to reflect the change of file type of RELEASE
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TST: mark google tests as slow
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"2014-06-27T11:41:38Z"
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MEMBER
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closes #3985.
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ENH: raise a more a useful exception on empty files
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BUG: matplotlib invert_xaxis crashes when using datetime
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"2013-06-22T11:56:21Z"
"2013-07-10T18:39:23Z"
"2013-07-10T18:39:23Z"
MEMBER
null
From [stackoverflow](http://stackoverflow.com/questions/16456751/matplotlib-axis-invert-xaxis-crashes-when-using-datetime), a question from more than a month ago, but still an issue I think (tested with master). Basicly, when using `ax.invert_xaxis()` with datetime x-values, the following exception is raised: ``` RuntimeError: MillisecondLocator estimated to generate 5270400 ticks from 2012-08-01 00:00:00+00:00 to 2012-10-01 00:00:00+00:00: exceeds Locator.MAXTICKS* 2 (2000) ``` --- At first it may not seem an error from pandas, as you can trigger it by using pure matplotlib code, but the error comes from pandas\tseries\converter.py. And more, it is by _importing pandas that causes working matplotlib code to work no longer_: ``` python import numpy as np import matplotlib.pyplot as plt import datetime x = np.array([datetime.datetime(2012, 8, 1, 0, 0), datetime.datetime(2012, 9, 1, 0, 0), datetime.datetime(2012, 10, 1, 0, 0)], dtype=object) y = np.array([-1,0,1]) ## Working matplotlib! fig, ax = plt.subplots() ax.plot(x,y) ax.invert_xaxis() plt.show() import pandas as pd ## Same matplotlib not working anymore after importing pandas fig, ax = plt.subplots() ax.plot(x,y) ax.invert_xaxis() plt.show() ``` --- **CAUSE of the bug**: When using `ax.invert_xaxis()` the left and right xlim are interchanged. Because of this the `delta` in PandasAutoDateLocator will be negative (https://github.com/pydata/pandas/blob/master/pandas/tseries/converter.py#L241). This in turn triggers MilliSecondLocator instead of the normal AutoDateLocator, and causes the error as the datetime range is too big for MilliSecondLocator. What I **don't understand** is why this is not happening when using pandas `plot` to create the axes object (the workaround I gave at [stackoverflow](http://stackoverflow.com/questions/16456751/matplotlib-axis-invert-xaxis-crashes-when-using-datetime/16460828#16460828)): ``` python df = pd.DataFrame(y, index=x, columns=['test']) ## This works as expected! fig, ax = plt.subplots() df.plot(ax=ax) ax.invert_xaxis() plt.show() ```
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BUG: invert_xaxis (negative tot_sec) triggers MilliSecondLocator (#3990)
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11
"2013-06-22T12:13:47Z"
"2014-06-25T21:40:21Z"
"2013-07-10T18:39:00Z"
MEMBER
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Solves issue #3990. Negative timedelta for xaxis range will no longer trigger MilliSecondLocator.
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Please, refer to this question in StackOverflow for more details: http://stackoverflow.com/q/17252024/832621 The OP reads a csv using: ``` data_df = pd.read_csv("example.csv", sep="\t", index_col=0, names=["test"]) ``` And when doing integration using the "Index" object at data_df.index it does not work, but works with data_df.index.values,,,, Is it a bug? Thank you! Saullo
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doc build WARNINGs with HEAD
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Here is the log shown: ``` python make.py ... checking consistency... /tmp/pandas/doc/source/generated/pandas.DataFrame.load.rst:: WARNING: document isn't included in any toctree /tmp/pandas/doc/source/generated/pandas.DataFrame.save.rst:: WARNING: document isn't included in any toctree /tmp/pandas/doc/source/generated/pandas.Panel.load.rst:: WARNING: document isn't included in any toctree /tmp/pandas/doc/source/generated/pandas.Panel.save.rst:: WARNING: document isn't included in any toctree /tmp/pandas/doc/source/generated/pandas.Series.load.rst:: WARNING: document isn't included in any toctree /tmp/pandas/doc/source/generated/pandas.Series.save.rst:: WARNING: document isn't included in any toctree /tmp/pandas/doc/source/generated/pandas.core.common.load.rst:: WARNING: document isn't included in any toctree /tmp/pandas/doc/source/generated/pandas.core.common.save.rst:: WARNING: document isn't included in any toctree done preparing documents... done ... ```
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BUG: Google finance is returning object dtype data (rather than float)
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Problem with Series.clip with Timestamp threshold
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"2013-06-22T17:55:42Z"
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CONTRIBUTOR
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``` >>> import pandas as pd >>> s = pd.Series(pd.date_range('2013-05-01', '2013-05-03')) >>> s 0 2013-05-01 00:00:00 1 2013-05-02 00:00:00 2 2013-05-03 00:00:00 dtype: datetime64[ns] >>> s.clip_lower(s[1]) 0 2013-05-02 00:00:00 1 1367452800000000000 2 1367539200000000000 dtype: object >>> s.clip_lower(s[1].value) 0 2013-05-02 00:00:00 1 2013-05-02 00:00:00 2 2013-05-03 00:00:00 dtype: datetime64[ns] >>> print pd.__version__ 0.11.1.dev-f1a3226 ``` Any reason not to implement clip_lower and clip_upper with Series.where rather than np.where? It solves this problem.
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Dropna=False is ignored for MultiIndex stack.
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CONTRIBUTOR
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``` >>> df = pd.DataFrame({'A': ['a1', 'a2'], 'B': ['b1', 'b2'], 'C': [1, 1]}) >>> df A B C 0 a1 b1 1 1 a2 b2 1 # Unstack introduces some NaNs >>> df.set_index(['A', 'B']).unstack() C B b1 b2 A a1 1 NaN a2 NaN 1 # Stack with dropna=False should keep the NaNs, but doesn't. >>> df.set_index(['A', 'B']).unstack().stack(dropna=False) C A B a1 b1 1 a2 b2 1 # This is what I expected to get >>> df.set_index(['A', 'B']).unstack().stack(dropna=False) C A B a1 b1 1 b2 NaN a2 b1 NaN b2 1 ``` The problem seems to be with reshape.py, line 495 with forces dropna=True. ``` if isinstance(frame.columns, MultiIndex): return _stack_multi_columns(frame, level=level, dropna=True) ```
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3,998
BUG: Use Series.where rather than np.where in clip
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"2014-07-16T08:15:26Z"
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CONTRIBUTOR
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Closes #3996
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BUG: (GH3997) Fix for dropna=False in stack
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CONTRIBUTOR
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Fixes #3997
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CLN: fix python26 invalid exception
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