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BUG: Series.asof fails for all NaN Series (GH15713) #15758

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BUG: Series.asof fails for all NaN Series (GH15713) #15758

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676a4e5
Test
Mar 20, 2017
c78d687
BUG #15713 Series.asof return nan when series is all nans
Mar 21, 2017
4e26ab8
BUG #15713 Series.asof return nan when series is all nans.
Mar 21, 2017
17d1d77
BUG #15713 Series.asof return nan when series is all nans!
Mar 21, 2017
89fb6cf
BUG #15713 fixing failing tests
Mar 21, 2017
6b745af
Adding DataFrame tests & support, and optimizing the code
Mar 21, 2017
70c958f
Added tests for non-default indexes, scalar and multiple inputs, and …
Mar 23, 2017
3f9c7fd
Minor comments
Mar 23, 2017
04b7306
Removing .values and formating code PEP8
Mar 24, 2017
a080b9b
Making scalar input return in a Series
Mar 25, 2017
7448b96
Fixing scalar input
Mar 25, 2017
b8f078a
Small code standard change
Mar 25, 2017
af9a29b
Setting name of asof result when scalar input and all nan
Mar 25, 2017
bb63964
Propagating Series name
Mar 25, 2017
0765108
First simplification, code-block in the same place
Mar 25, 2017
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3 changes: 3 additions & 0 deletions pandas/core/generic.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3971,6 +3971,9 @@ def asof(self, where, subset=None):
if not isinstance(where, Index):
where = Index(where) if is_list else Index([where])

if self.isnull().values.all():
return pd.Series([np.nan])
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This will not work for a DataFrame (I mean: it will not be the correct return value, see the docstring)

Further, you can put this after the next line where nulls is defined and reuse that

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done! thanks for the comments, feels great to learn how to contribute :)


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see if you can simplify this logic a bit (maybe set the name where is_list is used before)

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hey @jreback , I made a small simplification, pls check if that's ok... if it's ok, now I think everything is good to go

nulls = self.isnull() if is_series else self[subset].isnull().any(1)
locs = self.index.asof_locs(where, ~(nulls.values))

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7 changes: 7 additions & 0 deletions pandas/tests/series/test_asof.py
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Expand Up @@ -4,6 +4,8 @@
from pandas import (offsets, Series, notnull,
isnull, date_range, Timestamp)

from pandas.util.testing import assert_series_equal
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No need to import this, you can use it as tm.assert_series_equal(..) as is done in the other tests

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done


import pandas.util.testing as tm

from .common import TestData
Expand Down Expand Up @@ -148,3 +150,8 @@ def test_errors(self):
s = Series(np.random.randn(N), index=rng)
with self.assertRaises(ValueError):
s.asof(s.index[0], subset='foo')

# series is all nans
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can you add the issue number as a comment

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done

result = Series([np.nan]).asof([0])
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Can you make this a separate test? (as it is not related to errors). Eg test_all_nans

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done

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Can you also add a case not using zero as the argument?
And can you also add the case of a scalar, and of multiple values? (eg s.asof(10) and s.asof([10, 11])

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done

expected = Series([np.nan])
assert_series_equal(result, expected)