Version 0.20.2 (June 4, 2017)#
This is a minor bug-fix release in the 0.20.x series and includes some small regression fixes, bug fixes and performance improvements. We recommend that all users upgrade to this version.
What’s new in v0.20.2
Enhancements#
Unblocked access to additional compression types supported in pytables: ‘blosc:blosclz, ‘blosc:lz4’, ‘blosc:lz4hc’, ‘blosc:snappy’, ‘blosc:zlib’, ‘blosc:zstd’ (GH14478)
Series
provides ato_latex
method (GH16180)A new groupby method
ngroup()
, parallel to the existingcumcount()
, has been added to return the group order (GH11642); see here.
Performance improvements#
Performance regression fix when indexing with a list-like (GH16285)
Performance regression fix for MultiIndexes (GH16319, GH16346)
Improved performance of
.clip()
with scalar arguments (GH15400)Improved performance of groupby with categorical groupers (GH16413)
Improved performance of
MultiIndex.remove_unused_levels()
(GH16556)
Bug fixes#
Silenced a warning on some Windows environments about “tput: terminal attributes: No such device or address” when detecting the terminal size. This fix only applies to python 3 (GH16496)
Bug in using
pathlib.Path
orpy.path.local
objects with io functions (GH16291)Bug in
Index.symmetric_difference()
on two equal MultiIndex’s, results in aTypeError
(GH13490)Bug in
DataFrame.update()
withoverwrite=False
andNaN values
(GH15593)Passing an invalid engine to
read_csv()
now raises an informativeValueError
rather thanUnboundLocalError
. (GH16511)Bug in
cut()
whenlabels
are set, resulting in incorrect label ordering (GH16459)Fixed a compatibility issue with IPython 6.0’s tab completion showing deprecation warnings on
Categoricals
(GH16409)
Conversion#
Bug in
to_numeric()
in which empty data inputs were causing a segfault of the interpreter (GH16302)Silence numpy warnings when broadcasting
DataFrame
toSeries
with comparison ops (GH16378, GH16306)
Indexing#
Bug in
DataFrame.reset_index(level=)
with single level index (GH16263)Bug in partial string indexing with a monotonic, but not strictly-monotonic, index incorrectly reversing the slice bounds (GH16515)
Bug in
MultiIndex.remove_unused_levels()
that would not return aMultiIndex
equal to the original. (GH16556)
IO#
Bug in
read_csv()
whencomment
is passed in a space delimited text file (GH16472)Bug in
read_csv()
not raising an exception with nonexistent columns inusecols
when it had the correct length (GH14671)Bug that would force importing of the clipboard routines unnecessarily, potentially causing an import error on startup (GH16288)
Bug that raised
IndexError
when HTML-rendering an emptyDataFrame
(GH15953)Bug in
read_csv()
in which tarfile object inputs were raising an error in Python 2.x for the C engine (GH16530)Bug where
DataFrame.to_html()
ignored theindex_names
parameter (GH16493)Bug where
pd.read_hdf()
returns numpy strings for index names (GH13492)Bug in
HDFStore.select_as_multiple()
where start/stop arguments were not respected (GH16209)
Plotting#
GroupBy/resample/rolling#
Sparse#
Bug in construction of
SparseDataFrame
fromscipy.sparse.dok_matrix
(GH16179)
Reshaping#
Bug in
DataFrame.stack
with unsorted levels inMultiIndex
columns (GH16323)Bug in
pd.wide_to_long()
where no error was raised wheni
was not a unique identifier (GH16382)Bug in
Series.isin(..)
with a list of tuples (GH16394)Bug in construction of a
DataFrame
with mixed dtypes including an all-NaT column. (GH16395)Bug in
DataFrame.agg()
andSeries.agg()
with aggregating on non-callable attributes (GH16405)
Numeric#
Bug in
.interpolate()
, wherelimit_direction
was not respected whenlimit=None
(default) was passed (GH16282)
Categorical#
Fixed comparison operations considering the order of the categories when both categoricals are unordered (GH16014)
Other#
Bug in
DataFrame.drop()
with an empty-list with non-unique indices (GH16270)
Contributors#
A total of 34 people contributed patches to this release. People with a “+” by their names contributed a patch for the first time.
Aaron Barber +
Andrew 亮 +
Becky Sweger +
Christian Prinoth +
Christian Stade-Schuldt +
DSM
Erik Fredriksen +
Hugues Valois +
Jeff Reback
Jeff Tratner
JimStearns206 +
John W. O’Brien
Joris Van den Bossche
JosephWagner +
Keith Webber +
Mehmet Ali “Mali” Akmanalp +
Pankaj Pandey
Patrick Luo +
Patrick O’Melveny +
Pietro Battiston
RobinFiveWords +
Ryan Hendrickson +
SimonBaron +
Tom Augspurger
WBare +
bpraggastis +
chernrick +
chris-b1
economy +
gfyoung
jaredsnyder +
keitakurita +
linebp
lloydkirk +