PERF: do not check for label presence preventively #21594
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toobaz
added
Refactor
This was referenced Jun 22, 2018
jschendel
reviewed
Jun 22, 2018
doc/source/whatsnew/v0.24.0.txt
Outdated
| @@ -198,6 +199,7 @@ Indexing | |||
| ^^^^^^^^ | |||
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| - The traceback from a ``KeyError`` when asking ``.loc`` for a single missing label is now shorter and more clear (:issue:`21557`) | |||
| - When ``.ix`` is asked for a missing integer label in a :class:`MultiIndex` with a first level of integer type, it now raises a ``KeyError``, consistently with the case of a flat :class:``Int64Index`` (:issue:`21593`) | |||
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Extra backticks in :class:``Int64Index``
Codecov Report
@@ Coverage Diff @@
## master #21594 +/- ##
==========================================
+ Coverage 91.9% 91.9% +<.01%
==========================================
Files 153 153
Lines 49547 49530 -17
==========================================
- Hits 45537 45523 -14
+ Misses 4010 4007 -3
Continue to review full report at Codecov.
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jreback
requested changes
Jun 22, 2018
doc/source/whatsnew/v0.24.0.txt
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| @@ -130,6 +130,7 @@ Performance Improvements | |||
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| - Improved performance of :func:`Series.describe` in case of numeric dtpyes (:issue:`21274`) | |||
| - Improved performance of :func:`pandas.core.groupby.GroupBy.rank` when dealing with tied rankings (:issue:`21237`) | |||
| - Improved performance of label indexing when key is a single label (:issue:`21594`) | |||
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mention / reference .loc/.at here
| @@ -230,7 +230,7 @@ def test_iloc_getitem_multiindex(self): | |||
| # corner column | |||
| rs = mi_int.iloc[2, 2] | |||
| with catch_warnings(record=True): | |||
| xp = mi_int.ix[:, 2].ix[2] | |||
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not that we care too much, but is this case looks slightly different from below (where testing for .ix)?
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Yes, because as long as first level is non-int, .ix is fine. Adding a comment.
jreback
requested changes
Jun 22, 2018
doc/source/whatsnew/v0.24.0.txt
Outdated
| @@ -198,6 +199,7 @@ Indexing | |||
| ^^^^^^^^ | |||
|
|
|||
| - The traceback from a ``KeyError`` when asking ``.loc`` for a single missing label is now shorter and more clear (:issue:`21557`) | |||
| - When ``.ix`` is asked for a missing integer label in a :class:`MultiIndex` with a first level of integer type, it now raises a ``KeyError``, consistently with the case of a flat :class:``Int64Index`` (:issue:`21593`) | |||
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what did this raise before? (or did it work?)
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@jreback added a couple of comments, ready for me |
jreback
approved these changes
Jun 25, 2018
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thanks @toobaz nice code removal! keep em coming! |
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git diff upstream/master -u -- "*.py" | flake8 --diffASV run:
We don't check anymore if errors raised in indexing have to do with ordering different types (in Python 3)... but I can't think of any possible case (and none is present in the tests) in which looking for a single label could create a sorting problem.