Whats New in 0.24.2 (March 12, 2019)

Warning

The 0.24.x series of releases will be the last to support Python 2. Future feature releases will support Python 3 only. See Plan for dropping Python 2.7 (opens new window) for more.

These are the changes in pandas 0.24.2. See Release Notes (opens new window) for a full changelog including other versions of pandas.

Fixed Regressions

• Fixed regression in DataFrame.all() (opens new window) and DataFrame.any() (opens new window) where bool_only=True was ignored (GH25101 (opens new window))
• Fixed issue in DataFrame construction with passing a mixed list of mixed types could segfault. (GH25075 (opens new window))
• Fixed regression in DataFrame.apply() (opens new window) causing RecursionError when dict-like classes were passed as argument. (GH25196 (opens new window))
• Fixed regression in DataFrame.replace() (opens new window) where regex=True was only replacing patterns matching the start of the string (GH25259 (opens new window))
• Fixed regression in DataFrame.duplicated() (opens new window), where empty dataframe was not returning a boolean dtyped Series. (GH25184 (opens new window))
• Fixed regression in Series.min() (opens new window) and Series.max() (opens new window) where numeric_only=True was ignored when the Series contained Categorical data (GH25299 (opens new window))
• Fixed regression in subtraction between Series (opens new window) objects with datetime64[ns] dtype incorrectly raising OverflowError when the Series on the right contains null values (GH25317 (opens new window))
• Fixed regression in TimedeltaIndex (opens new window) where np.sum(index) incorrectly returned a zero-dimensional object instead of a scalar (GH25282 (opens new window))
• Fixed regression in IntervalDtype construction where passing an incorrect string with ‘Interval’ as a prefix could result in a RecursionError. (GH25338 (opens new window))
• Fixed regression in creating a period-dtype array from a read-only NumPy array of period objects. (GH25403 (opens new window))
• Fixed regression in Categorical (opens new window), where constructing it from a categorical Series and an explicit categories= that differed from that in the Series created an invalid object which could trigger segfaults. (GH25318 (opens new window))
• Fixed regression in to_timedelta() (opens new window) losing precision when converting floating data to Timedelta data (GH25077 (opens new window)).
• Fixed pip installing from source into an environment without NumPy (GH25193 (opens new window))
• Fixed regression in DataFrame.replace() (opens new window) where large strings of numbers would be coerced into int64, causing an OverflowError (GH25616 (opens new window))
• Fixed regression in factorize() (opens new window) when passing a custom na_sentinel value with sort=True (GH25409 (opens new window)).
• Fixed regression in DataFrame.to_csv() (opens new window) writing duplicate line endings with gzip compress (GH25311 (opens new window))

Bug Fixes

I/O

• Better handling of terminal printing when the terminal dimensions are not known (GH25080 (opens new window))
• Bug in reading a HDF5 table-format DataFrame created in Python 2, in Python 3 (GH24925 (opens new window))
• Bug in reading a JSON with orient='table' generated by DataFrame.to_json() (opens new window) with index=False (GH25170 (opens new window))
• Bug where float indexes could have misaligned values when printing (GH25061 (opens new window))

Reshaping

• Bug in transform() (opens new window) where applying a function to a timezone aware column would return a timezone naive result (GH24198 (opens new window))
• Bug in DataFrame.join() (opens new window) when joining on a timezone aware DatetimeIndex (opens new window) (GH23931 (opens new window))

Visualization

• Bug in Series.plot() (opens new window) where a secondary y axis could not be set to log scale (GH25545 (opens new window))

Other

• Bug in Series.is_unique() (opens new window) where single occurrences of NaN were not considered unique (GH25180 (opens new window))
• Bug in merge() (opens new window) when merging an empty DataFrame with an Int64 column or a non-empty DataFrame with an Int64 column that is all NaN (GH25183 (opens new window))
• Bug in IntervalTree where a RecursionError occurs upon construction due to an overflow when adding endpoints, which also causes IntervalIndex (opens new window) to crash during indexing operations (GH25485 (opens new window))
• Bug in Series.size (opens new window) raising for some extension-array-backed Series, rather than returning the size (GH25580 (opens new window))
• Bug in resampling raising for nullable integer-dtype columns (GH25580 (opens new window))

Contributors

A total of 25 people contributed patches to this release. People with a “+” by their names contributed a patch for the first time.

• Albert Villanova del Moral
• Arno Veenstra +
• chris-b1
• Devin Petersohn +
• EternalLearner42 +
• Flavien Lambert +
• gfyoung
• Gioia Ballin
• jbrockmendel
• Jeff Reback
• Jeremy Schendel
• Johan von Forstner +
• Joris Van den Bossche
• Josh
• Justin Zheng
• Kendall Masse
• Matthew Roeschke
• Max Bolingbroke +
• rbenes +
• Sterling Paramore +
• Tao He +
• Thomas A Caswell
• Tom Augspurger
• Vibhu Agarwal +
• William Ayd
• Zach Angell