Version 0.20.2 (June 4, 2017) — pandas 2.2.3 documentation (original) (raw)

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
• Performance improvements
• Bug fixes
  • Conversion
  • Indexing
  • IO
  • Plotting
  • GroupBy/resample/rolling
  • Sparse
  • Reshaping
  • Numeric
  • Categorical
  • Other
• Contributors

Enhancements#

• Unblocked access to additional compression types supported in pytables: ‘blosc:blosclz, ‘blosc:lz4’, ‘blosc:lz4hc’, ‘blosc:snappy’, ‘blosc:zlib’, ‘blosc:zstd’ (GH 14478)
• Series provides a to_latex method (GH 16180)
• A new groupby method GroupBy.ngroup(), parallel to the existing GroupBy.cumcount(), has been added to return the group order (GH 11642); seehere.

Performance improvements#

• Performance regression fix when indexing with a list-like (GH 16285)
• Performance regression fix for MultiIndexes (GH 16319, GH 16346)
• Improved performance of .clip() with scalar arguments (GH 15400)
• Improved performance of groupby with categorical groupers (GH 16413)
• Improved performance of MultiIndex.remove_unused_levels() (GH 16556)

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 (GH 16496)
• Bug in using pathlib.Path or py.path.local objects with io functions (GH 16291)
• Bug in Index.symmetric_difference() on two equal MultiIndex’s, results in a TypeError (GH 13490)
• Bug in DataFrame.update() with overwrite=False and NaN values (GH 15593)
• Passing an invalid engine to read_csv() now raises an informativeValueError rather than UnboundLocalError. (GH 16511)
• Bug in unique() on an array of tuples (GH 16519)
• Bug in cut() when labels are set, resulting in incorrect label ordering (GH 16459)
• Fixed a compatibility issue with IPython 6.0’s tab completion showing deprecation warnings on Categoricals (GH 16409)

Conversion#

• Bug in to_numeric() in which empty data inputs were causing a segfault of the interpreter (GH 16302)
• Silence numpy warnings when broadcasting DataFrame to Series with comparison ops (GH 16378, GH 16306)

Indexing#

• Bug in DataFrame.reset_index(level=) with single level index (GH 16263)
• Bug in partial string indexing with a monotonic, but not strictly-monotonic, index incorrectly reversing the slice bounds (GH 16515)
• Bug in MultiIndex.remove_unused_levels() that would not return a MultiIndex equal to the original. (GH 16556)

IO#

• Bug in read_csv() when comment is passed in a space delimited text file (GH 16472)
• Bug in read_csv() not raising an exception with nonexistent columns in usecols when it had the correct length (GH 14671)
• Bug that would force importing of the clipboard routines unnecessarily, potentially causing an import error on startup (GH 16288)
• Bug that raised IndexError when HTML-rendering an empty DataFrame (GH 15953)
• Bug in read_csv() in which tarfile object inputs were raising an error in Python 2.x for the C engine (GH 16530)
• Bug where DataFrame.to_html() ignored the index_names parameter (GH 16493)
• Bug where pd.read_hdf() returns numpy strings for index names (GH 13492)
• Bug in HDFStore.select_as_multiple() where start/stop arguments were not respected (GH 16209)

Plotting#

• Bug in DataFrame.plot with a single column and a list-like color (GH 3486)
• Bug in plot where NaT in DatetimeIndex results in Timestamp.min (GH 12405)
• Bug in DataFrame.boxplot where figsize keyword was not respected for non-grouped boxplots (GH 11959)

GroupBy/resample/rolling#

• Bug in creating a time-based rolling window on an empty DataFrame (GH 15819)
• Bug in rolling.cov() with offset window (GH 16058)
• Bug in .resample() and .groupby() when aggregating on integers (GH 16361)

Sparse#

• Bug in construction of SparseDataFrame from scipy.sparse.dok_matrix (GH 16179)

Reshaping#

• Bug in DataFrame.stack with unsorted levels in MultiIndex columns (GH 16323)
• Bug in pd.wide_to_long() where no error was raised when i was not a unique identifier (GH 16382)
• Bug in Series.isin(..) with a list of tuples (GH 16394)
• Bug in construction of a DataFrame with mixed dtypes including an all-NaT column. (GH 16395)
• Bug in DataFrame.agg() and Series.agg() with aggregating on non-callable attributes (GH 16405)

Numeric#

• Bug in .interpolate(), where limit_direction was not respected when limit=None (default) was passed (GH 16282)

Categorical#

• Fixed comparison operations considering the order of the categories when both categoricals are unordered (GH 16014)

Other#

• Bug in DataFrame.drop() with an empty-list with non-unique indices (GH 16270)

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 +